npj Quantum Materials最新文献

Strain-induced moiré polar vortex in twisted paraelectric freestanding bilayers 扭曲对电独立双层中应变诱导的涡流极涡

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-11 DOI: 10.1038/s41535-025-00796-x

Yixuan Zhang, Haozhi Sha, Xueyun Wang, Deshan Liang, Jing Wang, Qian Li, Rong Yu, Houbing Huang

{"title":"Strain-induced moiré polar vortex in twisted paraelectric freestanding bilayers","authors":"Yixuan Zhang, Haozhi Sha, Xueyun Wang, Deshan Liang, Jing Wang, Qian Li, Rong Yu, Houbing Huang","doi":"10.1038/s41535-025-00796-x","DOIUrl":"https://doi.org/10.1038/s41535-025-00796-x","url":null,"abstract":"The recent discovery of two-dimensional (2D) moiré vortex patterns reveals new possibilities for nanoscale polar topology engineering and unexplored physical phenomena. However, the physical origin and detailed topological characteristics of these moiré vortex patterns have still not been understood. In this study, based on the lattice polarization coupling of ferroelectrics, we analytically determined the discovered strain state in twisted bilayer systems by elastic theory. Furthermore, the resulting moiré vortex patterns are investigated via phase-field simulations. Our findings demonstrate that the in-plane moiré vortex patterns arise from periodic displacement vorticity induced by moiré stacking. The complex interplay among elastic, flexoelectric, and gradient energy is identified as the energetic driving force behind the formation of these vortex patterns. Through three-dimensional simulation, we reveal that each polar vortex exhibits significant in-plane divergence and out-of-plane chirality, with the latter being tunable via external electric fields. These findings offer new avenues for manipulating nanoscale ferroelectric topologies.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"35 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144603003","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

Orbital magnetoelectric coupling of three dimensional Chern insulators 三维陈氏绝缘子的轨道磁电耦合

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-11 DOI: 10.1038/s41535-025-00794-z

Xin Lu, Renwen Jiang, Zhongqing Guo, Jianpeng Liu

引用次数: 0

Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2 三角形反铁磁体K2Co(SeO3)2的万尼尔态和自旋超固体物理

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-05 DOI: 10.1038/s41535-025-00791-2

M. Zhu, Leandro M. Chinellato, V. Romerio, N. Murai, S. Ohira-Kawamura, Christian Balz, Z. Yan, S. Gvasaliya, Yasuyuki Kato, C. D. Batista, A. Zheludev

{"title":"Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2","authors":"M. Zhu, Leandro M. Chinellato, V. Romerio, N. Murai, S. Ohira-Kawamura, Christian Balz, Z. Yan, S. Gvasaliya, Yasuyuki Kato, C. D. Batista, A. Zheludev","doi":"10.1038/s41535-025-00791-2","DOIUrl":"https://doi.org/10.1038/s41535-025-00791-2","url":null,"abstract":"We combine ultra-high-resolution inelastic neutron scattering and quantum Monte Carlo simulations to study thermodynamics and spin excitations in the spin-supersolid phase of the triangular lattice XXZ antiferromagnet K2Co(SeO3)2 under zero and non-zero magnetic field. BKT transitions signaling the onset of Ising and supersolid order are clearly identified, and the Wannier entropy is experimentally recovered just above the supersolid phase. At low temperatures, with an experimental resolution of about 23 μeV, no discrete coherent magnon modes are resolved within a broad scattering continuum. Alongside gapless excitations, a pseudo-Goldstone mode with a 0.06 meV gap is observed. A second, higher-energy continuum replaces single-spin-flip excitations of the Ising model. Under applied fields, the continuum evolves into coherent spin waves, with Goldstone and pseudo-Goldstone sectors responding differently. The experiments and simulations show excellent quantitative agreement.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"7 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144566004","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

Intriguing kagome topological materials 有趣的kagome拓扑材料

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-03 DOI: 10.1038/s41535-025-00790-3

Qi Wang, Hechang Lei, Yanpeng Qi, Claudia Felser

引用次数: 0

Universal approach to light driven “superconductivity” via preformed pairs 通过预制对实现光驱动“超导性”的通用方法

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-03 DOI: 10.1038/s41535-025-00787-y

Ke Wang, Zhiqiang Wang, Qijin Chen, K. Levin

{"title":"Universal approach to light driven “superconductivity” via preformed pairs","authors":"Ke Wang, Zhiqiang Wang, Qijin Chen, K. Levin","doi":"10.1038/s41535-025-00787-y","DOIUrl":"https://doi.org/10.1038/s41535-025-00787-y","url":null,"abstract":"While there are many different mechanisms which have been proposed to understand the physics behind light induced “superconductivity”, what seems to be common to the class of materials in which this is observed are strong pairing correlations, which are present in the normal state. Here we argue, that the original ideas of Eliashberg are applicable to such a pseudogap phase and that with exposure to radiation the fermions are redistributed to higher energies where they are less deleterious to pairing. What results then is a photo-induced state with dramatically enhanced number of nearly condensed fermion pairs. In this phase, because the a.c. conductivity, σ(ω) = σ1(ω) + iσ2(ω), is dominated by the bosonic contribution, it can be computed using conventional (Aslamazov Larkin) fluctuation theory. We, thereby, observe the expected fingerprint of this photoinduced “superconducting” state which is a 1/ω dependence in σ2 with fits to the data of the same quality as found for the so-called photo-enhanced (Drude) conductivity scenario. Here, however, we have a microscopic understanding of the characteristic low energy scale which appears in transport and which is necessarily temperature dependent. This approach also provides insight into recent observations of concomitant diamagnetic fluctuations. Our calculations suggest that the observed light-induced phase in these strongly paired superconductors has only short range phase coherence without long range superconducting order.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"20 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144566006","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

Emergence of Meron Kekulé lattices in twisted Néel antiferromagnets 扭曲n<s:1>反铁磁体中Meron kekul<s:1>晶格的出现

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-01 DOI: 10.1038/s41535-025-00789-w

Kyoung-Min Kim, Se Kwon Kim

引用次数: 0

Unusual 5f magnetism in new kagome material UV6Sn6 新kagome材料UV6Sn6的异常磁性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-01 DOI: 10.1038/s41535-025-00783-2

S. M. Thomas, C. S. Kengle, W. Simeth, Chan-young Lim, Z. W. Riedel, K. Allen, A. Schmidt, M. Ruf, Seonggeon Gim, J. D. Thompson, F. Ronning, A. O. Scheie, C. Lane, J. D. Denlinger, S. Blanco-Canosa, Jian-Xin Zhu, E. D. Bauer, P. F. S. Rosa

{"title":"Unusual 5f magnetism in new kagome material UV6Sn6","authors":"S. M. Thomas, C. S. Kengle, W. Simeth, Chan-young Lim, Z. W. Riedel, K. Allen, A. Schmidt, M. Ruf, Seonggeon Gim, J. D. Thompson, F. Ronning, A. O. Scheie, C. Lane, J. D. Denlinger, S. Blanco-Canosa, Jian-Xin Zhu, E. D. Bauer, P. F. S. Rosa","doi":"10.1038/s41535-025-00783-2","DOIUrl":"https://doi.org/10.1038/s41535-025-00783-2","url":null,"abstract":"Materials in the family RV6Sn6 (R = rare earth) provide a unique platform to investigate the interplay between local moments from R layers and nonmagnetic vanadium kagome layers. Yet, the investigation of actinide members remains scarce. Here we report the synthesis of UV6Sn6 single crystals through the self-flux technique. Physical property measurements reveal two uranium-driven antiferromagnetic transitions at TN1 = 29 K and TN2 = 24 K, a complex field-temperature phase diagram, and unusual negative domain-wall magnetoresistance. Specific heat and angle-resolved photoemission spectroscopy measurements show a moderate f-electron enhancement to the density of states at the Fermi level (EF), whereas our band structure calculations place the vanadium flat bands 0.25 eV above EF. These findings point to a materials opportunity to expand the uranium 166 family with the goal of enhancing correlations by tuning 5f and 3d flat bands to EF.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"47 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520745","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

Superconducting phase diagram of finite-layer nickelates Ndn+1NinO2n+2 有限层镍酸盐Ndn+1NinO2n+2超导相图

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-01 DOI: 10.1038/s41535-025-00786-z

Andreas Hausoel, Simone Di Cataldo, Motoharu Kitatani, Oleg Janson, Karsten Held

引用次数: 0

Dynamic mechanical writing of skyrmion-like polar nanodomains 类skyrmion极性纳米畴的动态机械书写

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-01 DOI: 10.1038/s41535-025-00781-4

Jaegyu Kim, Youngki Yeo, Yong-Jun Kwon, Juhyun Lee, Jeongdae Seo, Seungbum Hong, Chan-Ho Yang

{"title":"Dynamic mechanical writing of skyrmion-like polar nanodomains","authors":"Jaegyu Kim, Youngki Yeo, Yong-Jun Kwon, Juhyun Lee, Jeongdae Seo, Seungbum Hong, Chan-Ho Yang","doi":"10.1038/s41535-025-00781-4","DOIUrl":"https://doi.org/10.1038/s41535-025-00781-4","url":null,"abstract":"Ferroelectric materials exhibit a wealth of topological polar structures that hold promise for high-density, energy-efficient information technologies. Ferroelectric polarization configurations can be flipped by non-uniform mechanical stresses and associated lattice deformations and can be understood in the quasi-static regime based on flexoelectricity, but little is known about the dynamic mechanical excitations that generate topological ferroelectric structures. Here, we discover stable centre-type skyrmion-like polar nanodomains in super-tetragonal BiFeO3 thin films generated by vibrational tapping using scanning probe microscope tips. Vibrational tapping can bidirectionally switch out-of-plane polarization by exerting strong dynamic force onto the elastically soft state emerging from strain-driven morphotropic phase transitions, which may be attributed to unconventional non-linear flexoelectric effects in the large strain-gradient regime. Our study provides a novel pathway into not only dynamic mechanoelectric coupling and topological polar structures, but also dynamic mechanical excitation technologies applicable to various fields.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"11 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144521050","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

Symmetry and minimal Hamiltonian of nonsymmorphic collinear antiferromagnet MnTe 非对称共线反铁磁体MnTe的对称性和最小哈密顿量

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-07-01 DOI: 10.1038/s41535-025-00784-1

Koichiro Takahashi, Hong-Fei Huang, Jie-Xiang Yu, Jiadong Zang

引用次数: 0