Nature Physics最新文献_第5页

Metrology supports product safety 计量支持产品安全

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-02987-6

Louise Wright

引用次数: 0

How to soothe the turmoil in the field of pressure-induced superconductivity in the hydrides 如何缓和氢化物中压力诱导超导领域的动荡

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-02969-8

Liling Sun, Qi Wu, Tao Xiang, Ho-kwang Mao

引用次数: 0

Strongly interacting Hofstadter states in magic-angle twisted bilayer graphene 魔角扭曲双层石墨烯中强相互作用的霍夫施塔特态

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-02997-4

Minhao He, Xiaoyu Wang, Jiaqi Cai, Jonah Herzog-Arbeitman, Ran Peng, Takashi Taniguchi, Kenji Watanabe, Ady Stern, B. Andrei Bernevig, Matthew Yankowitz, Oskar Vafek, Xiaodong Xu

{"title":"Strongly interacting Hofstadter states in magic-angle twisted bilayer graphene","authors":"Minhao He, Xiaoyu Wang, Jiaqi Cai, Jonah Herzog-Arbeitman, Ran Peng, Takashi Taniguchi, Kenji Watanabe, Ady Stern, B. Andrei Bernevig, Matthew Yankowitz, Oskar Vafek, Xiaodong Xu","doi":"10.1038/s41567-025-02997-4","DOIUrl":"10.1038/s41567-025-02997-4","url":null,"abstract":"Magic-angle twisted bilayer graphene hosts a variety of strongly correlated states at partial fillings of its flat bands. In a magnetic field, these flat bands evolve into a Hofstadter spectrum renormalized by strong Coulomb interactions. Here we study the interacting Hofstadter states that spontaneously form within the topological magnetic sub-bands of an ultraclean magic-angle twisted bilayer graphene device, including symmetry-broken Chern insulator states and fractional quantum Hall states. The observed symmetry-broken Chern insulator states form a cascade, with their Chern numbers mimicking the main sequence of correlated Chern insulators. The fractional quantum Hall states form in a Jain sequence. However, they disappear at high magnetic field, in contrast to conventional fractional quantum Hall states that strengthen with increasing magnetic field. We reveal a magnetic-field-driven phase transition from composite fermion phases to a dissipative Fermi liquid. Our theoretical analysis of the magnetic sub-bands hosting the fractional quantum Hall states predicts non-uniform quantum geometric properties far from the lowest Landau level. This points towards a more natural interpretation of these states as in-field fractional Chern insulators of the magnetic sub-bands. Interacting electrons in Hofstadter bands can form symmetry-broken topological states. These are now revealed in magic-angle twisted bilayer graphene, and their properties are influenced by non-uniform quantum geometry.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1380-1386"},"PeriodicalIF":18.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812887","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

Fractional computing 分数计算

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-03012-6

引用次数: 0

Stable singular fractional skyrmion spin texture from the quantum Kelvin–Helmholtz instability 来自量子开尔文-亥姆霍兹不稳定性的稳定奇异分数斯基米子自旋织构

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-08 DOI: 10.1038/s41567-025-02982-x

SeungJung Huh, Wooyoung Yun, Gabin Yun, Samgyu Hwang, Kiryang Kwon, Junhyeok Hur, Seungho Lee, Hiromitsu Takeuchi, Se Kwon Kim, Jae-yoon Choi

{"title":"Stable singular fractional skyrmion spin texture from the quantum Kelvin–Helmholtz instability","authors":"SeungJung Huh, Wooyoung Yun, Gabin Yun, Samgyu Hwang, Kiryang Kwon, Junhyeok Hur, Seungho Lee, Hiromitsu Takeuchi, Se Kwon Kim, Jae-yoon Choi","doi":"10.1038/s41567-025-02982-x","DOIUrl":"10.1038/s41567-025-02982-x","url":null,"abstract":"Topological defects give rise to non-trivial excitations—such as solitons, vortices and skyrmions—characterized by integer-valued topological charges. However, their classification becomes difficult when singularities are present in the order parameter field, complicating the computation of these charges. Although exotic nonlinear excitations have been theoretically proposed in the superfluid 3He-A phase and spinor Bose–Einstein condensates, they have not been experimentally observed and their stability has not been investigated. Here we demonstrate the presence of a singular skyrmion that goes beyond the framework of topology in a ferromagnetic superfluid. These skyrmions emerge from anomalous symmetry-breaking associated with an eccentric spin singularity and carry half the elementary charge—a feature that distinguishes them from conventional skyrmions and merons. We realize the universal regime of the quantum Kelvin–Helmholtz instability, and we identify the unconventional fractional skyrmions produced by emission from a magnetic domain wall and the spontaneous splitting of an integer skyrmion with spin singularities. The singular skyrmions are stable even after 2 s of hold time. Our results confirm the universality between classical and quantum Kelvin–Helmholtz instabilities and broaden our understanding of complex nonlinear dynamics for a non-trivial texture in topological quantum systems. The quantum Kelvin–Helmholtz instability can induce non-trivial topological excitations. Now a proof-of-principle experiment demonstrates the emergence of a stable singular fractional skyrmion spin texture originating from this quantum instability.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1398-1403"},"PeriodicalIF":18.4,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797130","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

Multistable polar textures in geometrically frustrated nematic liquid crystals 几何挫折向列液晶中的多稳定极性织构

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-08 DOI: 10.1038/s41567-025-02966-x

Ufuoma I. Kara, Boyuan Chen, Simon Čopar, Shucong Li, Rajdeep Mamtani, Yang Xu, Alan H. Weible, Eric C. Boerner, Zhan Yang, Yuxing Yao, Robin L. B. Selinger, Uroš Tkalec, Xiaoguang Wang

{"title":"Multistable polar textures in geometrically frustrated nematic liquid crystals","authors":"Ufuoma I. Kara, Boyuan Chen, Simon Čopar, Shucong Li, Rajdeep Mamtani, Yang Xu, Alan H. Weible, Eric C. Boerner, Zhan Yang, Yuxing Yao, Robin L. B. Selinger, Uroš Tkalec, Xiaoguang Wang","doi":"10.1038/s41567-025-02966-x","DOIUrl":"10.1038/s41567-025-02966-x","url":null,"abstract":"The ability to manipulate polar entities with multiple external fields could enable functionalities and applications in spin systems, photonics, metamaterials and soft matter. Liquid crystals that exhibit both a crystalline structure and liquid fluidity represent a promising platform for manipulating phases with polar molecular order, notably ferroelectric ones. However, achieving a polar symmetry is challenging with rod-shaped liquid crystal molecules, which form predominantly apolar nematic phases. Here we report an approach in which a geometric lattice confinement of nematic liquid crystals is used to induce planar polar order on the scale of a mesoscopic metamaterial. We confine the nematic liquid crystal in a micropillar array, forming topological defect–pillar pairs of elastic dipoles with a free top interface in contact with an immiscible fluid. The resulting dipole lattice configurations can be programmed rheologically by flowing the top fluid and maintained even after flow cessation, a phenomenon attributed to orientational multistability of the dipoles. This multimemory effect enables the encoding and reconfiguration of directional information. Overall, these results advance our understanding of topological dipoles under confinement and shear flow, enabling the detection, tracking and recording of flow profiles and could facilitate the development of stimuli-responsive materials. Programmable topological dipoles could be used in stimuli-responsive materials. Now it is shown that confinement of an apolar liquid crystal results in controllable polar arrangements of elastic dipoles.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1404-1411"},"PeriodicalIF":18.4,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797129","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

Frustrated electron hopping from the orbital configuration in a two-dimensional lattice 二维晶格中受挫的电子从轨道构型中跳跃

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-07 DOI: 10.1038/s41567-025-02953-2

Aravind Devarakonda, Christie S. Koay, Daniel G. Chica, Morgan Thinel, Asish K. Kundu, Zhi Lin, Alexandru B. Georgescu, Sebastian Rossi, Sae Young Han, Michael E. Ziebel, Madisen A. Holbrook, Anil Rajapitamahuni, Elio Vescovo, Kenji Watanabe, Takashi Taniguchi, Milan Delor, Xiaoyang Zhu, Abhay N. Pasupathy, Raquel Queiroz, Cory R. Dean, Xavier Roy

{"title":"Frustrated electron hopping from the orbital configuration in a two-dimensional lattice","authors":"Aravind Devarakonda, Christie S. Koay, Daniel G. Chica, Morgan Thinel, Asish K. Kundu, Zhi Lin, Alexandru B. Georgescu, Sebastian Rossi, Sae Young Han, Michael E. Ziebel, Madisen A. Holbrook, Anil Rajapitamahuni, Elio Vescovo, Kenji Watanabe, Takashi Taniguchi, Milan Delor, Xiaoyang Zhu, Abhay N. Pasupathy, Raquel Queiroz, Cory R. Dean, Xavier Roy","doi":"10.1038/s41567-025-02953-2","DOIUrl":"10.1038/s41567-025-02953-2","url":null,"abstract":"Electron hopping on spatially periodic lattices gives rise to intriguing electronic behaviour. For example, hopping on the geometrically frustrated two-dimensional kagome, dice and Lieb lattices yields electronic band structures with both massless Dirac-like and perfectly dispersion-less, flat bands. As materials featuring the dice and Lieb lattice structures are scarce, an alternative approach proposes to leverage atomic orbitals to realize the characteristic electron hopping of geometrically frustrated lattices. This strategy promises to expand the list of candidate materials with frustrated electron hopping, but is yet to be shown in experiments. Here we demonstrate frustrated hopping in the van der Waals intermetallic Pd5AlI2, emerging from the arrangement of atomic orbitals in a primitive square lattice. Using angle-resolved photoemission spectroscopy and quantum oscillation measurements, we reveal that the band structure of Pd5AlI2 includes linear Dirac-like bands intersected at their crossing point by a locally flat band—an essential characteristic of frustrated hopping in Lieb and dice lattices. Moreover, this compound shows exceptional chemical stability, with its unusual bulk band structure and metallicity persisting in ambient conditions down to the monolayer limit. Hence, our results showcase a way to realize electronic structures characteristic of geometrically frustrated lattices in non-frustrated systems. Electron hopping in geometrically frustrated lattices can result in a rich variety of unusual behaviours. Now, the orbital arrangement in a van der Waals metal with a non-frustrated, primitive lattice is found to show similar effects.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 8","pages":"1260-1266"},"PeriodicalIF":18.4,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792293","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

Frustrated electron motion arising from the orbital configuration in a layered metal 层状金属中由轨道构型引起的受挫电子运动

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-07 DOI: 10.1038/s41567-025-02962-1

引用次数: 0

Fast optical control of a coherent hole spin in a microcavity 微腔中相干空穴自旋的快速光学控制

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-07 DOI: 10.1038/s41567-025-02988-5

Mark R. Hogg, Nadia O. Antoniadis, Malwina A. Marczak, Giang N. Nguyen, Timon L. Baltisberger, Alisa Javadi, Rüdiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton

{"title":"Fast optical control of a coherent hole spin in a microcavity","authors":"Mark R. Hogg, Nadia O. Antoniadis, Malwina A. Marczak, Giang N. Nguyen, Timon L. Baltisberger, Alisa Javadi, Rüdiger Schott, Sascha R. Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton","doi":"10.1038/s41567-025-02988-5","DOIUrl":"10.1038/s41567-025-02988-5","url":null,"abstract":"Many of the most promising quantum information platforms store quantum information in electronic or atomic spins. To incorporate these devices into quantum networks, a spin–photon interface is required. Currently, the best on-demand single-photon sources use a semiconductor quantum dot in an engineered photonic environment. However, it is difficult to achieve coherent spin control in a high-performance single-photon source, and spin coherence is limited by magnetic noise from nuclear spins in the semiconductor host material. Here we combine all-optical spin control with a quantum dot in an open microcavity. We demonstrate fast coherent rotations of a hole spin around an arbitrary axis of the Bloch sphere with a maximum π-pulse fidelity of 98.6%. To suppress the slow magnetic noise, we laser cool the nuclear spins using the hole as a central spin. This extends the hole spin free-induction-decay time by more than an order of magnitude. It becomes much larger than both rotation time and radiative recombination time of the spin, enabling the creation of many spin–photon pairs before the loss of spin coherence. Spin–photon interfaces provide a connection between quantum information stored in atomic or electronic spins and optical communications networks. A quantum photon emitter with long-lived, controllable coherent spin has now been demonstrated.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1475-1481"},"PeriodicalIF":18.4,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792276","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

High-purity quantum optomechanics at room temperature 室温下的高纯度量子光力学

IF 19.6 1区物理与天体物理

Nature Physics Pub Date : 2025-08-06 DOI: 10.1038/s41567-025-02976-9

Lorenzo Dania, Oscar Schmitt Kremer, Johannes Piotrowski, Davide Candoli, Jayadev Vijayan, Oriol Romero-Isart, Carlos Gonzalez-Ballestero, Lukas Novotny, Martin Frimmer

引用次数: 0