npj Quantum Materials最新文献

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

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-05-01 DOI: 10.1038/s41535-025-00761-8

Niccolò Sellati, Jacopo Fiore, Stefano Paolo Villani, Lara Benfatto, Mattia Udina

引用次数: 0

Coupled order parameters and photoinduced domain walls in the charge density wave of (TaSe4)2I （TaSe4）2I电荷密度波的耦合有序参数和光致畴壁

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-30 DOI: 10.1038/s41535-025-00762-7

Ryan A. Duncan, Gal Orenstein, Soyeun Kim, Yijing Huang, Huaiyu Wang, Samuel W. Teitelbaum, Jade Stanton, Matthew Hurley, Alexander Miller, Nicholas Leonard, Dillon Hanlon, David A. Reis, Taito Osaka, Yuya Kubota, Tadashi Togashi, Kejian Qu, Daniel P. Shoemaker, Takahiro Sato, Mariano Trigo

引用次数: 0

Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy 用k边共振非弹性x射线散射和拉曼光谱研究了Ba2CaOsO6的自旋轨道纠缠态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-27 DOI: 10.1038/s41535-025-00757-4

J. Okamoto, G. Shibata, Yu. S. Ponosov, H. Hayashi, K. Yamaura, H. Y. Huang, A. Singh, C. T. Chen, A. Tanaka, S. V. Streltsov, D. J. Huang, A. Fujimori

{"title":"Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy","authors":"J. Okamoto, G. Shibata, Yu. S. Ponosov, H. Hayashi, K. Yamaura, H. Y. Huang, A. Singh, C. T. Chen, A. Tanaka, S. V. Streltsov, D. J. Huang, A. Fujimori","doi":"10.1038/s41535-025-00757-4","DOIUrl":"https://doi.org/10.1038/s41535-025-00757-4","url":null,"abstract":"Transition-metal ions with 5d2 electronic configuration in a cubic crystal field are prone to have a vanishing dipolar magnetic moment but finite higher-order multipolar moments, and they are expected to exhibit exotic physical properties. Through an investigation using resonant inelastic X-ray scattering (RIXS), Raman spectroscopy, and theoretical ligand-field (LF) multiplet and ab initio calculations, we fully characterized the local electronic structure of Ba2CaOsO6, particularly, the crystal-field symmetry of the 5d2 electrons in this anomalous material. The low-energy multiplet excitations from RIXS at the oxygen K edge and Raman-active phonons both show no splitting. These findings are consistent with the ground state of Os ions dominated by magnetic octupoles. Obtained parameters pave the way for further realistic microscopic studies of this highly unusual class of materials, advancing our understanding of spin-orbit physics in systems with higher-order multipoles.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"16 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877897","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

Real-space chirality from crystalline topological defects in the Kitaev spin liquid 基塔耶夫自旋液体中来自晶体拓扑缺陷的实空间手性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-26 DOI: 10.1038/s41535-025-00765-4

Fay Borhani, Arnab Seth, Itamar Kimchi

{"title":"Real-space chirality from crystalline topological defects in the Kitaev spin liquid","authors":"Fay Borhani, Arnab Seth, Itamar Kimchi","doi":"10.1038/s41535-025-00765-4","DOIUrl":"https://doi.org/10.1038/s41535-025-00765-4","url":null,"abstract":"We show that certain crystalline topological defects in the gapless Kitaev honeycomb spin liquid model generate a chirality and Majorana fermion orbital magnetization that depends in a universal manner on their emergent flux. Focusing on 5–7 dislocations as building blocks, consisting of pentagon and heptagon disclinations, we identify the Kitaev bond label configurations that preserve solvability. By computing two formulations of local markers M(r) we find that the 5 and 7 lattice defects generate a real-space contribution to Chern number and an associated Majorana fermion orbital magnetization proportional to M(r). The sign of the M(r) contribution from each 5/7 defect, i.e. its qM = ± 1 chirality, is determined by the defect Frank angle sign F and emergent gauge field flux W = ± i through the expression qM = − iFW. Remarkably, though lattice curvature and torsion can interplay with the surrounding gapless background to modify the profile of M(r), its sign qM is determined locally, implying that crystalline defects in the Kitaev spin liquid can generate a robust and observable chirality.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"33 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876093","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