npj Quantum Materials最新文献_第5页

Giant Hall effect in a highly conductive frustrated magnet GdCu2 高导电性阻磁GdCu2中的巨霍尔效应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-06 DOI: 10.1038/s41535-025-00774-3

Kosuke Karube, Yoshichika Ōnuki, Taro Nakajima, Hsiao-Yi Chen, Hiroaki Ishizuka, Motoi Kimata, Takashi Ohhara, Koji Munakata, Takuya Nomoto, Ryotaro Arita, Taka-hisa Arima, Yoshinori Tokura, Yasujiro Taguchi

{"title":"Giant Hall effect in a highly conductive frustrated magnet GdCu2","authors":"Kosuke Karube, Yoshichika Ōnuki, Taro Nakajima, Hsiao-Yi Chen, Hiroaki Ishizuka, Motoi Kimata, Takashi Ohhara, Koji Munakata, Takuya Nomoto, Ryotaro Arita, Taka-hisa Arima, Yoshinori Tokura, Yasujiro Taguchi","doi":"10.1038/s41535-025-00774-3","DOIUrl":"https://doi.org/10.1038/s41535-025-00774-3","url":null,"abstract":"The Hall effect is one of the most fundamental but elusive phenomena in condensed matter physics due to the rich variety of underlying mechanisms. Here we report an exceptionally large Hall effect in a frustrated magnet GdCu2 with high conductivity. The Hall conductivity at the base temperature is as high as the order of 104–105 Ω−1 cm−1 and shows abrupt sign changes under magnetic fields. Remarkably, the giant Hall effect is rapidly suppressed as the longitudinal conductivity is lowered upon increasing temperature or introducing tiny amount of quenched disorder. Our systematic transport measurements combined with neutron scattering measurements, ab initio band calculations and spin model calculations indicate that the unusual Hall effect can be understood in terms of spin-splitting induced emergence/disappearance of Fermi pockets as well as skew scattering from spin-chiral cluster fluctuations in a field-polarized state. The present study demonstrates complex interplay among magnetization, spin-dependent electronic structure, and spin fluctuations in producing the giant Hall effect in highly conductive frustrated magnets with a distorted triangular lattice.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"60 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144236801","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-Chern-number Quantum anomalous Hall insulators in mixing-stacked MnBi2Te4 thin films 混合堆叠MnBi2Te4薄膜中的高陈氏数量子反常霍尔绝缘子

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-06 DOI: 10.1038/s41535-025-00775-2

Jiaheng Li, Quansheng Wu, Hongming Weng

{"title":"High-Chern-number Quantum anomalous Hall insulators in mixing-stacked MnBi2Te4 thin films","authors":"Jiaheng Li, Quansheng Wu, Hongming Weng","doi":"10.1038/s41535-025-00775-2","DOIUrl":"https://doi.org/10.1038/s41535-025-00775-2","url":null,"abstract":"Quantum anomalous Hall (QAH) insulators are characterized by vanishing longitudinal resistance and quantized Hall resistance in the absence of an external magnetic field. Among them, high-Chern-number QAH insulators offer multiple nondissipative current channels, making them crucial for the development of low-power-consumption electronics. Using first-principles calculations, we propose that high-Chern-number (C > 1) QAH insulators can be realized in MnBi2Te4 (MBT) multilayer films through the combination of mixed stacking orders, eliminating the need for additional buffer layers. The underlying physical mechanism is validated by calculating real-space-resolved anomalous Hall conductivity (AHC). Local AHC is found to be predominantly located in regions with consecutive correct stacking orders, contributing to quasi-quantized AHC. Conversely, regions with consecutive incorrect stacking contribute minimally to the total AHC, which can be attributed to the varied interlayer coupling in different stacking configurations. Our work provides valuable insights into the design principle for achieving large Chern numbers, and highlights the role of stacking configurations in manipulating electronic and topological properties in MBT films and its derivatives.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"42 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229074","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

Probing amplified Josephson plasmons in YBa2Cu3O6+x by multidimensional spectroscopy 用多维光谱探测YBa2Cu3O6+x中放大的约瑟夫森等离子体

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-06 DOI: 10.1038/s41535-025-00776-1

N. Taherian, M. Först, A. Liu, M. Fechner, D. Pavicevic, A. von Hoegen, E. Rowe, Y. Liu, S. Nakata, B. Keimer, E. Demler, M. H. Michael, A. Cavalleri

{"title":"Probing amplified Josephson plasmons in YBa2Cu3O6+x by multidimensional spectroscopy","authors":"N. Taherian, M. Först, A. Liu, M. Fechner, D. Pavicevic, A. von Hoegen, E. Rowe, Y. Liu, S. Nakata, B. Keimer, E. Demler, M. H. Michael, A. Cavalleri","doi":"10.1038/s41535-025-00776-1","DOIUrl":"https://doi.org/10.1038/s41535-025-00776-1","url":null,"abstract":"The nonlinear driving of collective modes in quantum materials can lead to a number of striking non-equilibrium functional responses, which merit a comprehensive exploration of underlying dynamics. However, the coherent coupling between nonlinearly-driven modes frequently involves multiple mode coordinates at once, and is often difficult to capture by one-dimensional pump probe spectroscopy. One example is phonon-mediated amplification of Josephson plasmons in YBa2Cu3O6+x, a phenomenon likely associated with the mysterious superconducting-like optical response observed in this material. Here, we report two-dimensional nonlinear spectroscopy measurements in driven YBa2Cu3O6+x. We excite apical oxygen phonons with pairs of mutually-delayed carrier envelope phase stable mid-infrared pump pulses, and detect time-modulated second-order nonlinear optical susceptibility. We find that the driven phonons parametrically amplify coherent pairs of fluctuating opposite-momentum Josephson plasma polaritons, corresponding to a squeezed state of the Josephson plasma.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"5 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229075","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

Revealing orbital texture of grey arsenic through linear dichroism in multidimensional photoemission spectroscopy 利用多维光电发射光谱的线性二色性揭示灰色砷的轨道结构

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-27 DOI: 10.1038/s41535-025-00764-5

Jingwei Dong, Jiuxiang Zhang, Zailan Zhang, Dan Luo, Yongguang Zhang, Zhesheng Chen, Runze Liu, Azzedine Bendounan, Zhongwei Chen

{"title":"Revealing orbital texture of grey arsenic through linear dichroism in multidimensional photoemission spectroscopy","authors":"Jingwei Dong, Jiuxiang Zhang, Zailan Zhang, Dan Luo, Yongguang Zhang, Zhesheng Chen, Runze Liu, Azzedine Bendounan, Zhongwei Chen","doi":"10.1038/s41535-025-00764-5","DOIUrl":"https://doi.org/10.1038/s41535-025-00764-5","url":null,"abstract":"Two-dimensional (2D) layered material grey arsenic exhibits great potential for electronic and optoelectronics devices. Identifying the orbital texture in the electronic energy bands close to Fermi level is crucial for understanding and further manipulating the optoelectronic properties of grey arsenic. In this work, we investigate the orbital properties from bulk-state and surface-state of grey arsenic by using multidimensional angle-resolved photoemission spectroscopy, under different light polarization and crystal orientation conditions. Furthermore, by combining the experimental results with first-principles calculations based on density functional theory (DFT), we reveal that both the surface and bulk states of grey arsenic contain 4 s, 4px, 4py and 4pz orbitals, but the orbital ratios are different. Our study offers new insight into the orbital nature of grey arsenic and also paves the way for investigation of orbital properties in other 2D materials.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"97 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145709","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

One dimensional edge localized YSR states in CrCl3 on NbSe2 NbSe2上CrCl3的一维边缘定域YSR态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-27 DOI: 10.1038/s41535-025-00759-2

Jan P. Cuperus, Arnold H. Kole, Andrés R. Botello-Méndez, Zeila Zanolli, Daniel Vanmaekelbergh, Ingmar Swart

引用次数: 0

From ferromagnetic semiconductor to antiferromagnetic metal in epitaxial CrxTey monolayers 从铁磁半导体到反铁磁金属的外延CrxTey单层

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-24 DOI: 10.1038/s41535-025-00772-5

Naina Kushwaha, Olivia Armitage, Brendan Edwards, Liam Trzaska, Jennifer Rigden, Peter Bencok, Deepnarayan Biswas, Tien-Lin Lee, Charlotte Sanders, Gerrit van der Laan, Peter Wahl, Phil D. C. King, Akhil Rajan

{"title":"From ferromagnetic semiconductor to antiferromagnetic metal in epitaxial CrxTey monolayers","authors":"Naina Kushwaha, Olivia Armitage, Brendan Edwards, Liam Trzaska, Jennifer Rigden, Peter Bencok, Deepnarayan Biswas, Tien-Lin Lee, Charlotte Sanders, Gerrit van der Laan, Peter Wahl, Phil D. C. King, Akhil Rajan","doi":"10.1038/s41535-025-00772-5","DOIUrl":"https://doi.org/10.1038/s41535-025-00772-5","url":null,"abstract":"Chromium ditelluride, CrTe2, is an attractive candidate van der Waals material for hosting 2D magnetism. However, how the room-temperature ferromagnetism of the bulk evolves as the sample is thinned to the single-layer limit has proved controversial. This, in part, reflects its metastable nature, vs. a series of more stable self-intercalation compounds with higher relative Cr:Te stoichiometry. Here, exploiting a recently developed method for enhancing nucleation in molecular-beam epitaxy growth of transition-metal chalcogenides, we demonstrate the selective stabilisation of high-coverage CrTe2 and Cr2+εTe3 epitaxial monolayers. Combining X-ray magnetic circular dichroism, scanning tunnelling microscopy, and temperature-dependent angle-resolved photoemission, we demonstrate that both compounds order magnetically with a similar TC. We find, however, that monolayer CrTe2 forms as an antiferromagnetic metal, while monolayer Cr2+εTe3 hosts an intrinsic ferromagnetic semiconducting state. This work thus demonstrates that control over the self-intercalation of metastable Cr-based chalcogenides provides a powerful route for tuning both their metallicity and magnetic structure, establishing the CrxTey system as a flexible materials class for future 2D spintronics.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"116 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130267","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

Separating altermagnetic and ferromagnetic effects in X-ray magnetic dichroism of rutile NiF2 分离金红石NiF2 x射线磁二色性中的交变和铁磁效应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-17 DOI: 10.1038/s41535-025-00753-8

A. Hariki, K. Sakurai, T. Okauchi, J. Kuneš

{"title":"Separating altermagnetic and ferromagnetic effects in X-ray magnetic dichroism of rutile NiF2","authors":"A. Hariki, K. Sakurai, T. Okauchi, J. Kuneš","doi":"10.1038/s41535-025-00753-8","DOIUrl":"https://doi.org/10.1038/s41535-025-00753-8","url":null,"abstract":"We present numerical simulations of X-ray magnetic circular dichroism (XMCD) at the L2,3 edge of Ni in the weakly ferromagnetic altermagnet NiF2. Our results predict a significant XMCD signal for light propagating perpendicular to the magnetic moments, which are approximately aligned along the [010] easy-axis direction. The analysis shows that the altermagnetic and ferromagnetic contributions to the XMCD signal can be uniquely distinguished by their dependence on an applied magnetic field. By varying the angle of the field relative to the easy axis, the in-plane orientation of both the Néel vector and the net magnetization can be systematically controlled. We further demonstrate that the XMCD signal, even under fields as strong as 40 T and for any in-plane orientation, can be accurately described as a linear combination of two spectral components, with geometrical prefactors determined by the field’s magnitude and direction. This insight enables experimental validation of the distinctive relationship between the Néel vector orientation and the X-ray Hall vector in the rutile structure. Quantitative simulations supporting these findings are provided.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"25 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066909","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

Spin signature of majorana fermions in topological nodal-point superconductors 拓扑节点超导体中马约拉纳费米子的自旋特征

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-15 DOI: 10.1038/s41535-025-00768-1

Junjie Zeng, James Jun He, Zhen Ning, Dong-Hui Xu, Rui Wang

引用次数: 0

Néel vector-dependent anomalous transport in altermagnetic metal CrSb 交变金属CrSb中与nsamel矢量相关的异常输运

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-15 DOI: 10.1038/s41535-025-00766-3

Tianye Yu, Ijaz Shahid, Peitao Liu, Ding-Fu Shao, Xing-Qiu Chen, Yan Sun

引用次数: 0

Theory of terahertz pump optical probe spectroscopy of phonon polaritons in noncentrosymmetric systems 非中心对称系统中声子极化子的太赫兹泵浦光探测光谱理论