Proceedings of the National Academy of Sciences of the United States of America最新文献_第9页

Impact of baleen whales on ocean primary production across space and time. 须鲸对海洋初级生产的时空影响。

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-20 DOI: 10.1073/pnas.2505563122

Carla Freitas,Morten D Skogen,Guðjón M Sigurðsson,Martin Biuw,Tore Haug,Lotta Lindblom,Kjell Gundersen

{"title":"Impact of baleen whales on ocean primary production across space and time.","authors":"Carla Freitas,Morten D Skogen,Guðjón M Sigurðsson,Martin Biuw,Tore Haug,Lotta Lindblom,Kjell Gundersen","doi":"10.1073/pnas.2505563122","DOIUrl":"https://doi.org/10.1073/pnas.2505563122","url":null,"abstract":"Primary production in the ocean is a fundamental process that supports marine food webs and global carbon sequestration. This process depends on nutrients that are often limited in surface waters. Whales are known to release essential elements such as nitrogen, phosphorus, and iron, yet the extent of their contribution to ocean primary production remains unclear. Here, we present daily estimates of nutrient input by baleen whales in high-latitude feeding grounds (Nordic and Barents Seas), based on multielement analyses of feces and urine. We then used end-to-end ecosystem models to assess the impact of these nutrients on primary production. We found that nitrogen is primarily excreted via urine, whereas phosphorus and trace elements are mainly released through feces. Ecosystem models indicate that baleen whales, including minke, fin, sei, humpback, blue, and bowhead whales, support annual and seasonal net primary production, with varying impacts across space and time. While the annual effects are modest (<2%) in most areas, the greatest impacts (up to 10%) occur during summer stratification and in offshore areas far from other nutrient sources. These increases in primary production have cascading effects on the food web, driving rises in mesozooplankton biomass. This study highlights the ecological significance of nutrient cycling by whales and underscores the value of integrating whale nutrient data into ecosystem modeling to assess the broader impacts of whales on marine productivity.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"12 1","pages":"e2505563122"},"PeriodicalIF":11.1,"publicationDate":"2025-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145331782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Invariant HVC size in female canaries singing under testosterone: Unlocking function through neural differentiation, not growth. 雄性激素作用下鸣叫的雌性金丝雀HVC大小不变：通过神经分化而非生长解锁功能。

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-20 DOI: 10.1073/pnas.2426847122

Shouwen Ma,Carolina Frankl-Vilches,Manfred Gahr

{"title":"Invariant HVC size in female canaries singing under testosterone: Unlocking function through neural differentiation, not growth.","authors":"Shouwen Ma,Carolina Frankl-Vilches,Manfred Gahr","doi":"10.1073/pnas.2426847122","DOIUrl":"https://doi.org/10.1073/pnas.2426847122","url":null,"abstract":"Testosterone administration to nonsinging adult female canaries induces song, making this a model for behavioral plasticity and its underlying neural mechanisms in vertebrates. The song control nucleus HVC is traditionally believed to undergo a substantial size change when transitioning from a nonfunctional to a functional (song-producing) state. Using 2-photon in vivo imaging, we tracked the spatial distribution and anatomical properties of HVC neurons over several weeks of testosterone-induced song development. Surprisingly, despite ultrastructural changes of HVC neurons, testosterone did neither alter neuronal spacing nor HVC size. Instead, spatial transcriptomics revealed that testosterone modulates gene networks throughout HVC, aligning transcriptomic profiles between its peripheral and central HVC regions in singing birds, thereby mimicking the histological appearance of an enlarging HVC. Our results demonstrate that changes in HVC size in adults reflect phenotypic changes in neurons within a stable framework. Importantly, the nonfunctional state is not associated with a reduced brain area volume, preserving HVC's capacity for functional differentiation throughout life.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"53 1","pages":"e2426847122"},"PeriodicalIF":11.1,"publicationDate":"2025-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145331825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The persistence of cross-cutting discussion in a politicized public sphere 在政治化的公共领域中持续进行跨领域讨论

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2516942122

Diana C. Mutz

{"title":"The persistence of cross-cutting discussion in a politicized public sphere","authors":"Diana C. Mutz","doi":"10.1073/pnas.2516942122","DOIUrl":"https://doi.org/10.1073/pnas.2516942122","url":null,"abstract":"Although studies of Americans’ general discussant networks have been repeated over time, research that assesses change in the nature of Americans’ political discussion networks has yet to be conducted in nationally representative probability surveys. In this study I answer two questions about the quality of the American public sphere that have generated widespread speculation, but little evidence to date. First, how have Americans’ political discussion networks changed over the past 25 y? Second, are the consequences of these changes what one would expect based on previous theory linking Americans’ interpersonal information environments to political tolerance and political participation? I resolve competing claims suggesting that people feel less free to discuss politics, with claims suggesting instead that political discussion now permeates everyday life to a greater extent than in the past. Findings suggest widespread increases in political discussion, changes driven almost entirely by increases in like-minded political discussion partners. Surprisingly, Americans are no more or less likely to engage in conversations across lines of political difference. The predicted consequences of these fluctuations confirm an intrinsic tension between characteristics valued in democratic citizens. Political tolerance has declined significantly, along with decreased awareness of rationales for others’ relative to one’s own views. Political participation is significantly higher on average than 25 y ago. Few people reported engaging with online political discussants, despite efforts to make sure they were included in network measures.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"23 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bridging microscopic dynamics and rheology in the yielding of charged colloidal suspensions 连接微观动力学和流变学在带电胶体悬浮液的屈服

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2514216122

Hongrui He, Heyi Liang, Miaoqi Chu, Zhang Jiang, Juan J. de Pablo, Matthew V. Tirrell, Suresh Narayanan, Wei Chen

{"title":"Bridging microscopic dynamics and rheology in the yielding of charged colloidal suspensions","authors":"Hongrui He, Heyi Liang, Miaoqi Chu, Zhang Jiang, Juan J. de Pablo, Matthew V. Tirrell, Suresh Narayanan, Wei Chen","doi":"10.1073/pnas.2514216122","DOIUrl":"https://doi.org/10.1073/pnas.2514216122","url":null,"abstract":"The yielding of soft materials is critical to many natural and industrial processes, yet experimental insights into microscopic aspects of yielding are limited. This study combines angle X-ray scattering, X-ray photon correlation spectroscopy, and in situ rheology (Rheo-SAXS-XPCS) with fast lubrication dynamics simulations to examine how interparticle interactions influence yielding in charged colloidal suspensions. By tuning attraction through salt addition, we compare repulsive and attractive systems under deformation. Repulsive suspensions yield uniformly with Andrade-like creep and minimal structural change. In contrast, attractive suspensions show complex behaviors, including shear banding, delayed yielding, and resolidification, governed by transient dynamics at shear band interfaces. These results directly link microscopic particle dynamics to macroscopic flow and demonstrate how interaction potentials control rheological behavior. This work offers a framework for designing soft materials with tailored properties for applications in coatings, food processing, drug delivery, and other technologies requiring precise mechanical control.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"50 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forest recovery after deforestation is fueled by mineral weathering at the expense of ecosystem buffering capacity 森林砍伐后的恢复是由矿物风化推动的，以牺牲生态系统的缓冲能力为代价

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2419123122

Emily S. Bernhardt, Emma J. Rosi, Christopher T. Solomon, John Campbell, Charles T. Driscoll, Mark B. Green, Gene E. Likens, William H. McDowell

{"title":"Forest recovery after deforestation is fueled by mineral weathering at the expense of ecosystem buffering capacity","authors":"Emily S. Bernhardt, Emma J. Rosi, Christopher T. Solomon, John Campbell, Charles T. Driscoll, Mark B. Green, Gene E. Likens, William H. McDowell","doi":"10.1073/pnas.2419123122","DOIUrl":"https://doi.org/10.1073/pnas.2419123122","url":null,"abstract":"The pace and trajectory of ecosystem development are governed by the availability and cycling of limiting nutrients, and anthropogenic disturbances such as acid rain and deforestation alter these trajectories by removing substantial quantities of nutrients via titration or harvest. Here, we use six decades of continuous chemical and hydrologic data from three adjacent headwater catchments in the Hubbard Brook Experimental Forest, New Hampshire—one deforested (W5), one CaSiO 3 -enriched (W1), and one reference (W6)—to quantify long-term nutrient and mineral fluxes. Acid deposition since 1900 drove pronounced depletion and export of base cations, particularly calcium, across all watersheds. Experimental deforestation of W5 intensified loss of biomass and nutrient cations and triggered sustained increases in streamwater pH, Ca 2+ , and SiO 2 exports over nearly four decades, greatly exceeding the effects of direct CaSiO 3 enrichment in both duration and magnitude. We detect no long-term changes in water yield or water flow paths in the experimental watersheds, and we attribute this multidecadal increase in weathering rates following deforestation to biological responses to severe nutrient limitation. Our evidence suggests that in the regrowing forest, plants are investing photosynthate into belowground processes that amplify mineral weathering to access phosphorus and micronutrients, consequently elevating the export of less limiting elements present in silicate parent material. Throughout decades of forest regrowth, enhanced biotic weathering has continued to deplete the acid buffering capacity of the terrestrial ecosystem while the export of weathering products has elevated the pH of the receiving stream.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"27 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145310807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineered 3D immuno-glial-neurovascular human miBrain model 工程化三维免疫-胶质-神经血管人人脑模型

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2511596122

Alice E. Stanton, Adele Bubnys, Emre Agbas, Benjamin James, Dong Shin Park, Alan Jiang, Rebecca L. Pinals, Liwang Liu, Nhat Truong, Anjanet Loon, Colin Staab, Oyku Cerit, Hsin-Lan Wen, David Mankus, Margaret E. Bisher, Abigail K. R. Lytton-Jean, Manolis Kellis, Joel W. Blanchard, Robert Langer, Li-Huei Tsai

{"title":"Engineered 3D immuno-glial-neurovascular human miBrain model","authors":"Alice E. Stanton, Adele Bubnys, Emre Agbas, Benjamin James, Dong Shin Park, Alan Jiang, Rebecca L. Pinals, Liwang Liu, Nhat Truong, Anjanet Loon, Colin Staab, Oyku Cerit, Hsin-Lan Wen, David Mankus, Margaret E. Bisher, Abigail K. R. Lytton-Jean, Manolis Kellis, Joel W. Blanchard, Robert Langer, Li-Huei Tsai","doi":"10.1073/pnas.2511596122","DOIUrl":"https://doi.org/10.1073/pnas.2511596122","url":null,"abstract":"Patient-specific, human-based cellular models integrating a biomimetic blood–brain barrier, immune, and myelinated neuron components are critically needed to enable accelerated, translationally relevant discovery of neurological disease mechanisms and interventions. To construct a human cell-based model that includes these features and all six major brain cell types needed to mimic disease and dissect pathological mechanisms, we have constructed, characterized, and utilized a multicellular integrated brain (miBrain) immuno-glial-neurovascular model by engineering a brain-inspired 3D hydrogel and identifying conditions to coculture these six brain cell types, all differentiated from patient induced pluripotent stem cells. miBrains recapitulate in vivo – like hallmarks inclusive of neuronal activity, functional connectivity, barrier function, myelin-producing oligodendrocyte engagement with neurons, multicellular interactions, and transcriptomic profiles. We implemented the model to study Alzheimer’s Disease pathologies associated with APOE4 genetic risk. APOE4 miBrains differentially exhibit amyloid aggregation, tau phosphorylation, and astrocytic glial fibrillary acidic protein. Unlike the coemergent fate specification of glia and neurons in other organoid approaches, miBrains integrate independently differentiated cell types, a feature we harnessed to identify that APOE4 in astrocytes promotes neuronal tau pathogenesis and dysregulation through crosstalk with microglia.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"64 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145310809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hierarchical dynamic coding coordinates speech comprehension in the human brain 分层动态编码协调人脑的语音理解

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2422097122

Laura Gwilliams, Alec Marantz, David Poeppel, Jean-Rémi King

{"title":"Hierarchical dynamic coding coordinates speech comprehension in the human brain","authors":"Laura Gwilliams, Alec Marantz, David Poeppel, Jean-Rémi King","doi":"10.1073/pnas.2422097122","DOIUrl":"https://doi.org/10.1073/pnas.2422097122","url":null,"abstract":"Speech comprehension involves transforming an acoustic waveform into meaning. To do so, the human brain generates a hierarchy of features that converts the sensory input into increasingly abstract language properties. However, little is known about how rapid incoming sequences of hierarchical features are continuously coordinated. Here, we propose that each language feature is supported by a dynamic neural code, which represents the sequence history of hierarchical features in parallel. To test this “hierarchical dynamic coding” (HDC) hypothesis, we use time-resolved decoding of brain activity to track the construction, maintenance, and update of a comprehensive hierarchy of language features spanning phonetic, word form, lexical–syntactic, syntactic, and semantic representations. For this, we recorded 21 native English participants with magnetoencephalography (MEG), while they listened to two hours of short stories in English. Our analyses reveal three main findings. First, the brain represents and simultaneously maintains a sequence of hierarchical features. Second, the duration of these representations depends on their level in the language hierarchy. Third, each representation is maintained by a dynamic neural code, which evolves at a speed commensurate with its corresponding linguistic level. This HDC preserves the maintenance of information over time while limiting destructive interference between successive features. Overall, HDC reveals how the human brain maintains and updates the continuously unfolding language hierarchy during natural speech comprehension, thereby anchoring linguistic theories to their biological implementations.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"38 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous grain dynamics and grain locomotion of odd crystals 奇晶的异常晶粒动力学和晶粒运动

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2511350122

Zhi-Feng Huang, Michael te Vrugt, Raphael Wittkowski, Hartmut Löwen

{"title":"Anomalous grain dynamics and grain locomotion of odd crystals","authors":"Zhi-Feng Huang, Michael te Vrugt, Raphael Wittkowski, Hartmut Löwen","doi":"10.1073/pnas.2511350122","DOIUrl":"https://doi.org/10.1073/pnas.2511350122","url":null,"abstract":"Crystalline or polycrystalline systems governed by odd elastic responses are known to exhibit complex dynamical behaviors involving self-propelled dynamics of topological defects with spontaneous self-rotation of chiral crystallites. Unveiling and controlling the underlying mechanisms require studies across multiple scales. We develop such a type of approach that bridges between microscopic and mesoscopic scales, in the form of a phase field crystal model incorporating transverse interactions. This continuum density field theory features two-dimensional parity symmetry breaking and odd elasticity, and generates a variety of interesting phenomena that agree well with recent experiments and particle-based simulations of active and living chiral crystals, including self-rotating crystallites, dislocation self-propulsion and proliferation, and fragmentation in polycrystals. We identify a distinct type of surface cusp instability induced by self-generated surface odd stress that results in self-fission of single-crystalline grains. This mechanism is pivotal for the occurrence of various anomalous grain dynamics for odd crystals, particularly the predictions of a transition from normal to reverse Ostwald ripening for self-rotating odd grains, and a transition from grain coarsening to grain self-fragmentation in the dynamical polycrystalline state with an increase of transverse interaction strength. We also demonstrate that the single-grain dynamics can be maneuvered through the variation of interparticle transverse interactions. This allows to steer the desired pathway of grain locomotion and to control the transition between grain self-rotation, self-rolling, and self-translation. Our results provide insights for the design and control of structural and dynamical properties of active odd elastic materials.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"1 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145310808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconfiguration of brain-wide neural activity after early life adversity 早期生活逆境后全脑神经活动的重构

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-17 DOI: 10.1073/pnas.2506140122

Taylor W. Uselman, Russell E. Jacobs, Elaine L. Bearer

{"title":"Reconfiguration of brain-wide neural activity after early life adversity","authors":"Taylor W. Uselman, Russell E. Jacobs, Elaine L. Bearer","doi":"10.1073/pnas.2506140122","DOIUrl":"https://doi.org/10.1073/pnas.2506140122","url":null,"abstract":"Early life adversity (ELA) predisposes individuals to physical and mental disorders lifelong. How ELA affects brain functions, leading to these vulnerabilities, is a mystery. To understand ELA’s impacts, investigations into neural activity affected by ELA must go beyond localized areas toward simultaneous recordings from multiple widely distributed regions over time. Such studies will expose relative activity between regions and discover shifts in regional activity in response to different experiences. Here, we performed longitudinal manganese-enhanced MRI (MEMRI) to measure degrees of brain-wide neural activity in ELA-exposed mice across a series of experiences in adulthood. To ascertain whether ELA resulted in atypical brain activity, results were compared to those of the standard mouse (Std). MEMRI captured activity in the freely moving home cage condition, and short- and long-term after exposure to TMT, a naturalistic predator threat. Images were normalized and aligned then analyzed with statistical mapping and automated segmentation. We found that neural activity in the home cage was greater in ELA compared to Std in multiple striatal-pallidal and hypothalamic regions. Upon acute threat, neural activity in Std increased in these regions to become more similar to that in ELA, while new hyperactive responses in ELA emerged in the midbrain and hindbrain. Nine days after acute threat, heightened neural activity in ELA persisted within locus coeruleus and increased within the posterior amygdala, ventral hippocampus, and dorsomedial and ventromedial hypothalamus. These results reveal functional imbalances that arise between multiple brain-systems after ELA, which are dependent upon context and cumulative experiences into adulthood.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"66 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband topological transitions in twisted elastodynamic metasurfaces. 扭曲弹性动力学超表面的宽带拓扑跃迁。

IF 11.1 1区综合性期刊

Proceedings of the National Academy of Sciences of the United States of America Pub Date : 2025-10-16 DOI: 10.1073/pnas.2427049122

Simon Yves,Yu-Gui Peng,Andrea Alù

{"title":"Broadband topological transitions in twisted elastodynamic metasurfaces.","authors":"Simon Yves,Yu-Gui Peng,Andrea Alù","doi":"10.1073/pnas.2427049122","DOIUrl":"https://doi.org/10.1073/pnas.2427049122","url":null,"abstract":"In the last decade, the connection between physics and topology has resulted in the discovery of several new phenomena. A celebrated example is the field of topological insulators [X.-L. Qi, S.-C. Zhang, Rev. Mod. Phys. 83, 1057-1110 (2011)]., in which topological quantities describing the bulk medium response in reciprocal space dictate the presence of protected transport states at the boundary of a finite sample. Broken symmetries in the microscopic structure of a material play a prominent role in determining its topological features relevant to these phenomena. As another landmark phenomenon driven by broken symmetries, twistronics leverages the rotation angle between coupled layers to control in extreme ways the dispersion topology, leading to flat-band superconductivity [Y. Cao et al., Nature 556, 43-50 (2018)] and topological transitions for polaritons [G. Hu et al., Nature 582, 209-213 (2020)]. Here, we apply these concepts to elastodynamic waves, and exploit the twist degree-of-freedom to control broken symmetries in the microscopic structure of elastic metasurfaces, demonstrating extreme wave control. We predict and experimentally demonstrate topological transitions within twisted elastodynamic metasurfaces, which we harness for broadband, reconfigurable, and robust manipulation of phonons. Our twist-elastic approach opens alternative directions in microelectronics, microfluidics, and ultrasound sensing, leveraging precise multifunctional engineering of mechanical vibrations of relevance to many modern technologies.","PeriodicalId":20548,"journal":{"name":"Proceedings of the National Academy of Sciences of the United States of America","volume":"34 1","pages":"e2427049122"},"PeriodicalIF":11.1,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145305350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0