npj Quantum Materials最新文献_第6页

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

Tailoring MBE growth of c-Mn3Sn directly on MgO (111) from islands to film c-Mn3Sn直接在MgO（111）上从岛到膜的MBE生长

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-24 DOI: 10.1038/s41535-025-00760-9

Longfei He, Ursula Ludacka, Payel Chatterjee, Matthias Hartl, Dennis Meier, Christoph Brüne

{"title":"Tailoring MBE growth of c-Mn3Sn directly on MgO (111) from islands to film","authors":"Longfei He, Ursula Ludacka, Payel Chatterjee, Matthias Hartl, Dennis Meier, Christoph Brüne","doi":"10.1038/s41535-025-00760-9","DOIUrl":"https://doi.org/10.1038/s41535-025-00760-9","url":null,"abstract":"We present our study of (0001) oriented Mn3Sn (c-Mn3Sn) thin films synthesized directly on an MgO (111) substrate via molecular beam epitaxy. We identify a growth window where Mn3Sn growth can be controlled through slight adjustments of the Mn flux, achieving either μm²-sized high crystalline-quality islands or an almost completely continuous film. High-resolution X-ray diffraction results indicate that both films are highly (0001) oriented. The atomic resolution images show clear film-substrate interfaces displaying an epitaxial relationship. Scanning precession electron diffraction measurements reveal that the island featured sample has highly crystallized Mn3Sn. The sample featuring a high continuity exhibits defects in some areas but retains the dominant Mn3Sn structure. This work demonstrates a potential method for synthesizing high crystalline-quality Mn3Sn films with substantial coverage, facilitating the study of Mn3Sn films without the influence of an additional buffer layer and promoting their application in integrated spintronics.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"14 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143872891","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

Quasi-linear magnetoresistance and paramagnetic singularity in hypervalent bismuthide 高价铋的准线性磁电阻和顺磁奇异性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-23 DOI: 10.1038/s41535-025-00758-3

Zhongchen Xu, Yi Yan, Zhihao Liu, Jie Pang, Guohao Dong, Xiutong Deng, Shengnan Zhang, Xianmin Zhang, Youguo Shi, Quansheng Wu

{"title":"Quasi-linear magnetoresistance and paramagnetic singularity in hypervalent bismuthide","authors":"Zhongchen Xu, Yi Yan, Zhihao Liu, Jie Pang, Guohao Dong, Xiutong Deng, Shengnan Zhang, Xianmin Zhang, Youguo Shi, Quansheng Wu","doi":"10.1038/s41535-025-00758-3","DOIUrl":"https://doi.org/10.1038/s41535-025-00758-3","url":null,"abstract":"Materials featuring hypervalent bismuth motifs have generated immense interest due to their extraordinary electronic structure and exotic quantum transport. In this study, we synthesized high-quality single crystals of La3ScBi5 characterized by one-dimensional hypervalent bismuth chains and performed a systematic investigation of the magnetoresistive behavior and quantum oscillations. The metallic La3ScBi5 exhibits a low-temperature plateau of electrical resistivity and quasi-linear positive magnetoresistance, with anisotropic magnetoresistive behaviors suggesting the presence of anisotropic Fermi surfaces. This distinctive transport phenomenon is perfectly elucidated by first-principles calculations utilizing the semiclassical Boltzmann transport theory. Furthermore, the nonlinear Hall resistivity pointed towards a multiband electronic structure, characterized by the coexistence of electron and hole carriers, which is further supported by our first-principles calculations. Angle-dependent de Haas-van Alphen oscillations are crucial for further elucidating its Fermiology and topological characteristics. Intriguingly, magnetization measurements unveiled a notable paramagnetic singularity at low fields, which might suggest the nontrivial nature of the surface states. Our findings underscore the interplay between transport phenomena and the unique electronic structure of hypervalent bismuthide La3ScBi5, opening avenues for exploring novel electronic applications.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"22 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867013","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

Control of ferroelectric polarization in BiFeO3 bilayer films through interface engineering 界面工程控制BiFeO3双层膜的铁电极化

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-22 DOI: 10.1038/s41535-025-00763-6

Xiaokang Yao, Can Wang, Lei Liao, Xinyan Wang, Ning Liang, Tao Yan, Rui Wang, Meng He, Er-Jia Guo, Chen Ge, Lifen Wang, Xuedong Bai, Guozhen Yang, Kuijuan Jin

{"title":"Control of ferroelectric polarization in BiFeO3 bilayer films through interface engineering","authors":"Xiaokang Yao, Can Wang, Lei Liao, Xinyan Wang, Ning Liang, Tao Yan, Rui Wang, Meng He, Er-Jia Guo, Chen Ge, Lifen Wang, Xuedong Bai, Guozhen Yang, Kuijuan Jin","doi":"10.1038/s41535-025-00763-6","DOIUrl":"https://doi.org/10.1038/s41535-025-00763-6","url":null,"abstract":"Predetermining the as-grown polarization of ferroelectric thin films is essential to integrate their reliable properties into electronic devices. However, studies have so far focused mainly on the control of the polarization state of a single ferroelectric layer. Here we report a strategy for the artificial modulation of pristine polarization in BiFeO3 bilayer films. We have fabricated multilayers of BiFeO3/SrTiO3/BiFeO3 on single-crystalline SrTiO3 (001) substrates. It is found that the out-of-plane polarization components of the BiFeO3 bilayer can be controlled by modifying the surface terminations of SrTiO3 interlayer and SrTiO3 substrate. Using aberration-corrected scanning transmission electron microscopy, we directly visualize the head-to-head and tail-to-tail polarization configurations formed by the BiFeO3 bilayers. Polar discontinuity at the ferroelectric/non-ferroelectric interface is the reason for tuning the orientation of electrical polarization. Our work provides an effective route to design fascinating ferroelectric multilayers with well-defined polarization direction.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"15 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857735","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

A magnon band analysis of GdRu2Si2 in the field-polarized state 场极化态下GdRu2Si2的磁振子带分析

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-16 DOI: 10.1038/s41535-025-00755-6

G. D. A. Wood, J. R. Stewart, D. A. Mayoh, J. A. M. Paddison, J. Bouaziz, S. M. Tobin, O. A. Petrenko, M. R. Lees, P. Manuel, J. B. Staunton, G. Balakrishnan

{"title":"A magnon band analysis of GdRu2Si2 in the field-polarized state","authors":"G. D. A. Wood, J. R. Stewart, D. A. Mayoh, J. A. M. Paddison, J. Bouaziz, S. M. Tobin, O. A. Petrenko, M. R. Lees, P. Manuel, J. B. Staunton, G. Balakrishnan","doi":"10.1038/s41535-025-00755-6","DOIUrl":"https://doi.org/10.1038/s41535-025-00755-6","url":null,"abstract":"Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu2Si2 is a candidate material that hosts a variety of multi-Q magnetic phases, including in zero-field. Here, inelastic neutron scattering is used to measure the spin excitations in the field-polarized phase of GdRu2Si2. Linear spin wave theory and a method of interaction invariant path analysis are used to derive a Hamiltonian accounting for the spectra. The Hamiltonian, dominated by bilinear (Ruderman-Kittel-Kasuya-Yosida) Heisenberg exchange, compares favorably to ab initio calculations. Dipolar interactions are a secondary energy scale to consider, with JD.D~ 0.05JRKKY. However, it is shown that in the field-polarized phase the dipolar interactions ‘self screen’ so that their effect is largely suppressed. No specific evidence for higher-order exchange is found. These aspects are discussed in the context of the lower field multi-Q states and the anisotropy of the system.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"7 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143836728","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

Altermagnetism classification Altermagnetism分类

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-12 DOI: 10.1038/s41535-025-00756-5

Sang-Wook Cheong, Fei-Ting Huang

引用次数: 0

Massive Dirac-Pauli physics in lead-halide perovskites 卤化铅钙钛矿中的大规模狄拉克-泡利物理

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-04-04 DOI: 10.1038/s41535-025-00754-7

Abhishek Shiva Kumar, Mikhail Maslov, Mikhail Lemeshko, Artem G. Volosniev, Zhanybek Alpichshev

{"title":"Massive Dirac-Pauli physics in lead-halide perovskites","authors":"Abhishek Shiva Kumar, Mikhail Maslov, Mikhail Lemeshko, Artem G. Volosniev, Zhanybek Alpichshev","doi":"10.1038/s41535-025-00754-7","DOIUrl":"https://doi.org/10.1038/s41535-025-00754-7","url":null,"abstract":"In standard quantum electrodynamics (QED), the so-called non-minimal (Pauli) coupling is suppressed for elementary particles and has no physical implications. Here, we show that the Pauli term naturally appears in a known family of Dirac materials—the lead-halide perovskites, suggesting a novel playground for the study of analog QED effects. We outline measurable manifestations of the Pauli term in the phenomena pertaining to (i) relativistic corrections to bound states (ii) the Klein paradox, and (iii) spin effects in scattering. In particular, we demonstrate that (a) the binding energy of an electron in the vicinity of a positively charged defect is noticeably decreased due to the polarizability of lead ions and the appearance of a Darwin-like term, (b) strong spin-orbit coupling due to the Pauli term affects the exciton states, and (c) scattering of an electron off an energy barrier with broken mirror symmetry produces spin polarization in the outgoing current. Our study adds to the understanding of quantum phenomena in lead-halide perovskites and paves the way for tabletop simulations of analog Dirac-Pauli equations.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"183 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782625","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

Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6 基塔耶夫蜂窝状铱酸D3LiIr2O6的连续磁激励

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-03-29 DOI: 10.1038/s41535-025-00748-5

Thomas Halloran, Yishu Wang, K. W. Plumb, M. B. Stone, Barry Winn, M. K. Graves-Brook, J. A. Rodriguez-Rivera, Yiming Qiu, Prashant Chauhan, Johannes Knolle, Roderich Moessner, N. P. Armitage, Tomohiro Takayama, Hidenori Takagi, Collin Broholm

{"title":"Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6","authors":"Thomas Halloran, Yishu Wang, K. W. Plumb, M. B. Stone, Barry Winn, M. K. Graves-Brook, J. A. Rodriguez-Rivera, Yiming Qiu, Prashant Chauhan, Johannes Knolle, Roderich Moessner, N. P. Armitage, Tomohiro Takayama, Hidenori Takagi, Collin Broholm","doi":"10.1038/s41535-025-00748-5","DOIUrl":"https://doi.org/10.1038/s41535-025-00748-5","url":null,"abstract":"Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function ({mathcal{S}}(Q,omega )) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state1,2.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"15 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736495","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