Nature Physics最新文献_第7页

Interplay between light and heavy electron bands in magic-angle twisted bilayer graphene 魔角扭曲双层石墨烯中轻电子带和重电子带的相互作用

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-22 DOI: 10.1038/s41567-025-02912-x

Rafael Luque Merino, Dumitru Călugăru, Haoyu Hu, Jaime Díez-Mérida, Andrés Díez-Carlón, Takashi Taniguchi, Kenji Watanabe, Paul Seifert, B. Andrei Bernevig, Dmitri K. Efetov

{"title":"Interplay between light and heavy electron bands in magic-angle twisted bilayer graphene","authors":"Rafael Luque Merino, Dumitru Călugăru, Haoyu Hu, Jaime Díez-Mérida, Andrés Díez-Carlón, Takashi Taniguchi, Kenji Watanabe, Paul Seifert, B. Andrei Bernevig, Dmitri K. Efetov","doi":"10.1038/s41567-025-02912-x","DOIUrl":"https://doi.org/10.1038/s41567-025-02912-x","url":null,"abstract":"Recent studies have suggested that the strongly correlated flat bands of magic-angle twisted bilayer graphene may host coexisting light and heavy carriers. Although transport and spectroscopic measurements have hinted at this behaviour, distinct signatures of incoherent heavy carriers have not been reported. Here we provide evidence of this by performing thermoelectric transport measurements of magic-angle twisted bilayer graphene using the photo-thermoelectric effect in gate-defined p–n junctions. At low temperatures, we observe sign-preserving, filling-dependent oscillations of the Seebeck coefficient at non-zero integer fillings of the moiré superlattice. This suggests the preponderance of one carrier type even when the Fermi level is tuned through the charge neutrality point of the correlated states. At higher temperatures, the thermoelectric response provides evidence of strong electron correlations in the unordered, normal state. Our observations are explained by the interplay between light, long-lived electron states and heavy, short-lived hole excitations near the Fermi level of the symmetry-broken ground states. These findings are in qualitative agreement with the topological heavy fermion model.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"18 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flows of liquid light seen in the synthetic frequency space of modulated fast-gain ring lasers 在调制快增益环形激光器的合成频率空间中看到的液体光流

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-22 DOI: 10.1038/s41567-025-02886-w

引用次数: 0

Quantum neural networks form Gaussian processes 量子神经网络形成高斯过程

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-21 DOI: 10.1038/s41567-025-02883-z

Diego García-Martín, Martín Larocca, M. Cerezo

{"title":"Quantum neural networks form Gaussian processes","authors":"Diego García-Martín, Martín Larocca, M. Cerezo","doi":"10.1038/s41567-025-02883-z","DOIUrl":"https://doi.org/10.1038/s41567-025-02883-z","url":null,"abstract":"Classical artificial neural networks initialized from independent and identically distributed priors converge to Gaussian processes in the limit of a large number of neurons per hidden layer. This correspondence plays an important role in the current understanding of the capabilities of neural networks. Here we prove an analogous result for quantum neural networks. We show that the outputs of certain models based on Haar-random unitary or orthogonal quantum neural networks converge to Gaussian processes in the limit of large Hilbert space dimension d. The derivation of this result is more nuanced than in the classical case due to the role played by the input states, the measurement observable and because the entries of unitary matrices are not independent. We show that the efficiency of predicting measurements at the output of a quantum neural network using Gaussian process regression depends on the number of measured qubits. Furthermore, our theorems imply that the concentration of measure phenomenon in Haar-random quantum neural networks is worse than previously thought, because expectation values and gradients concentrate as ({mathcal{O}}left({1}/{operatorname{e}^{d}sqrt{d}}right)).","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"32 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Valley-controlled photoswitching of metal–insulator nanotextures 金属绝缘体纳米结构的谷控光开关

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-21 DOI: 10.1038/s41567-025-02899-5

Hannes Böckmann, Jan Gerrit Horstmann, Felix Kurtz, Manuel Buriks, Karun Gadge, Salvatore R. Manmana, Stefan Wippermann, Claus Ropers

{"title":"Valley-controlled photoswitching of metal–insulator nanotextures","authors":"Hannes Böckmann, Jan Gerrit Horstmann, Felix Kurtz, Manuel Buriks, Karun Gadge, Salvatore R. Manmana, Stefan Wippermann, Claus Ropers","doi":"10.1038/s41567-025-02899-5","DOIUrl":"https://doi.org/10.1038/s41567-025-02899-5","url":null,"abstract":"Spatial heterogeneity and phase competition are hallmarks of strongly correlated materials, influencing phenomena such as colossal magnetoresistance and high-temperature superconductivity. Active control over phase textures further promises tunable functionality at the nanoscale. Although light-induced switching of a correlated insulator to a metallic state is well established, optical excitation generally lacks the specificity to select subwavelength domains and determine final textures. Here we drive the domain-specific quench of a textured Peierls insulator using valley-selective photodoping. Polarized excitation exploits the anisotropy of quasi-one-dimensional states at the charge-density-wave gap to initiate an insulator–metal transition with minimal electronic heating. We find that averting dissipation facilitates domain-specific carrier confinement, control over nanotextured phases and reduction in thermal relaxation from the metastable metallic state. This valley-selective photoexcitation approach will enable the activation of electronic phase separation beyond thermodynamic limitations, facilitating optically controlled hidden states, engineered heterostructures and polarization-sensitive percolation networks.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"77 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain-stiffening universality in composite hydrogels and soft tissues 复合水凝胶和软组织应变增强的普遍性

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-20 DOI: 10.1038/s41567-025-02869-x

Jake Song, Elad Deiss-Yehiely, Serra Yesilata, Gareth H. McKinley

{"title":"Strain-stiffening universality in composite hydrogels and soft tissues","authors":"Jake Song, Elad Deiss-Yehiely, Serra Yesilata, Gareth H. McKinley","doi":"10.1038/s41567-025-02869-x","DOIUrl":"https://doi.org/10.1038/s41567-025-02869-x","url":null,"abstract":"Soft biological tissues exhibit mechanical properties that reflect their composite structure of cells embedded within a biopolymer matrix. However, the microscopic mechanisms underlying their unique nonlinear mechanical response—characterized by strain stiffening in compression, but strain softening in shear or tension—remain poorly understood. Here we show that strain softening in composite systems can arise due to plastic dissipation, which is mediated by filler–polymer interactions. We characterize the nonlinear elasticity of composite hydrogels and soft tissues in isolation from these plastic effects, and show that their nonlinear elastic strain stiffening is driven by the stretching of the underlying biopolymer matrix. We thus show that strain stiffening in composite hydrogels and tissues is mediated by strain amplification factors that are universal in compression and shear. In doing so, we demonstrate the importance of fundamental composite properties such as filler concentration and filler–polymer interaction strength in mediating strain stiffening in composite systems. These findings highlight key structure–property relationships that underlie the nonlinear mechanics of biologically relevant soft solids such as composite gels and tissues.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"8 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entanglement meets artificial intelligence in quantum sensors 量子传感器中纠缠与人工智能的结合

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-19 DOI: 10.1038/s41567-025-02868-y

Alice Sinatra

引用次数: 0

Robust supermoiré pattern in large-angle single-twist bilayers 大角度单捻双分子层的鲁棒超监视模式

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-16 DOI: 10.1038/s41567-025-02914-9

Yanxing Li, Chuqiao Shi, Fan Zhang, Xiaohui Liu, Yuan Xue, Viet-Anh Ha, Qiang Gao, Chengye Dong, Yu-Chuan Lin, Luke N. Holtzman, Nicolás Morales-Durán, Hyunsue Kim, Yi Jiang, Madisen Holbrook, James Hone, Katayun Barmak, Joshua A. Robinson, Xiaoqin Li, Feliciano Giustino, Eslam Khalaf, Yimo Han, Chih-Kang Shih

{"title":"Robust supermoiré pattern in large-angle single-twist bilayers","authors":"Yanxing Li, Chuqiao Shi, Fan Zhang, Xiaohui Liu, Yuan Xue, Viet-Anh Ha, Qiang Gao, Chengye Dong, Yu-Chuan Lin, Luke N. Holtzman, Nicolás Morales-Durán, Hyunsue Kim, Yi Jiang, Madisen Holbrook, James Hone, Katayun Barmak, Joshua A. Robinson, Xiaoqin Li, Feliciano Giustino, Eslam Khalaf, Yimo Han, Chih-Kang Shih","doi":"10.1038/s41567-025-02914-9","DOIUrl":"https://doi.org/10.1038/s41567-025-02914-9","url":null,"abstract":"Forming long-wavelength moiré superlattices in van der Waals bilayers that have a small-angle twist between the two layers has been a key approach for creating moiré flat bands. However, for small twist angles, strong lattice reconstruction creates domain walls and other forms of disorder in the moiré pattern, posing considerable challenges for engineering such platforms. At large twist angles, the lattices are more rigid, but it is difficult to produce flat bands in shorter-wavelength moiré superlattices. Here we introduce an approach for tailoring robust supermoiré structures in bilayers of transition-metal dichalcogenides using only a single twist near a commensurate angle. Structurally, we show the spontaneous formation of a periodic arrangement of three inequivalent commensurate moiré stackings, where the angle deviation from the commensurate angle determines the periodicity. Electronically, we reveal a large set of van Hove singularities that indicate strong band hybridization, leading to flat bands near the valence band maximum. Our study extends the study of the interplay among band topology, quantum geometry and moiré superconductivity to the large twist angle regime.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"2 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Young metrologists’ vision 年轻计量学家的视野

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-15 DOI: 10.1038/s41567-025-02903-y

Chingis Kuanbayev, Kangyoung Sung

引用次数: 0

Metremania Metremania

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-05-15 DOI: 10.1038/s41567-025-02926-5

引用次数: 0

A human history of meteorites 人类的陨石历史

IF 19.6 1区物理与天体物理