npj Quantum Materials最新文献

Multi-Q spin-valley order in twisted WSe2 扭曲WSe2中的多q自旋谷序

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-24 DOI: 10.1038/s41535-026-00884-6

Arthur Bril, Nai Chao Hu, Nick Bultinck

引用次数: 0

Anisotropic magnetoresistance and magnetic field-tunable Weyl nodes in Weyl metal SrRuO3 thin films Weyl金属SrRuO3薄膜的各向异性磁阻和磁场可调谐Weyl节点

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-22 DOI: 10.1038/s41535-026-00882-8

Uddipta Kar, Akhilesh Kr. Singh, Elisha Cho-Hao Lu, P. V. Sreenivasa Reddy, Fu-En Cheng, Wazid Ahmed, Song Yang, Chun-Yen Lin, Chia-Hung Hsu, Guang-Yu Guo, Wei-Li Lee

{"title":"Anisotropic magnetoresistance and magnetic field-tunable Weyl nodes in Weyl metal SrRuO3 thin films","authors":"Uddipta Kar, Akhilesh Kr. Singh, Elisha Cho-Hao Lu, P. V. Sreenivasa Reddy, Fu-En Cheng, Wazid Ahmed, Song Yang, Chun-Yen Lin, Chia-Hung Hsu, Guang-Yu Guo, Wei-Li Lee","doi":"10.1038/s41535-026-00882-8","DOIUrl":"https://doi.org/10.1038/s41535-026-00882-8","url":null,"abstract":"Weyl semimetals are a unique class of topological materials, possessing Fermi-arc surface states and exhibiting the chiral anomaly effect. The chiral anomaly refers to non-equilibrium charge transfer within a Weyl-node pair of opposite chirality under the condition of aligned electric and magnetic fields (E∥B), leading to non-conserved chiral charges and thus enhanced electrical conductivity. In experiments, such an enhanced conductivity due to the chiral anomaly manifests as a negative longitudinal magnetoresistance (MR) when the external field H is applied along the bias current direction I. In this work, we present rigorous ϕ- and α-dependent magnetotransport measurements to investigate such a negative longitudinal MR due to the chiral anomaly in a sunbeam-shaped device fabricated from an untwinned Weyl metal SrRuO3 (SRO) thin film. Here, ϕ(α) represents the angle between I and the in-plane H(SRO monoclinic [001]o). Unusual ϕ dependences of in-plane MR and Hall effects were uncovered at low temperatures, accompanied by the emergence of the fourfold-symmetric component in the in-plane MR. These results indicate that the chiral anomaly and resistivity anisotropy in SRO play important roles. In particular, the dramatic variation of Weyl nodes near the Fermi level through magnetic field manipulation of the magnetization orientation, as revealed by band structure calculations, is consistent with the observed in-plane MR and Hall effect.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"18 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147734035","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

How pairing mechanism dictates topology in valley-polarized superconductors with Berry curvature 配对机制如何决定具有贝里曲率的谷极化超导体的拓扑结构

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-15 DOI: 10.1038/s41535-026-00878-4

Julian May-Mann, Tobias Helbig, Trithep Devakul

引用次数: 0

Spin-supersolidity induced quantum criticality and magnetocaloric effect in the triangular-lattice antiferromagnet Rb2Co(SeO3)2 三角形晶格反铁磁体Rb2Co(SeO3)2的自旋超固体诱导量子临界和磁热效应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-15 DOI: 10.1038/s41535-026-00881-9

Yi Cui, Zhanlong Wu, Zhongcen Sun, Kefan Du, Jun Luo, Shuo Li, Jie Yang, Jinchen Wang, Rui Zhou, Qian Chen, Yoshimitsu Kohama, Atsuhiko Miyata, Zhuo Yang, Rong Yu, Weiqiang Yu

{"title":"Spin-supersolidity induced quantum criticality and magnetocaloric effect in the triangular-lattice antiferromagnet Rb2Co(SeO3)2","authors":"Yi Cui, Zhanlong Wu, Zhongcen Sun, Kefan Du, Jun Luo, Shuo Li, Jie Yang, Jinchen Wang, Rui Zhou, Qian Chen, Yoshimitsu Kohama, Atsuhiko Miyata, Zhuo Yang, Rong Yu, Weiqiang Yu","doi":"10.1038/s41535-026-00881-9","DOIUrl":"https://doi.org/10.1038/s41535-026-00881-9","url":null,"abstract":"We performed high-field magnetization, magnetocaloric effect (MCE), and NMR measurements on the Ising triangular-lattice antiferromagnet Rb2Co(SeO3)2. The observations of the 1/3-magnetization plateau, the NMR line splits, and the thermal activation behaviors of the spin-lattice relaxation rate 1/T1 between 2 and 15.8 T provide unambiguous evidence of a gapped up–up–down (UUD) magnetic ordered phase. For fields between 15.8 and 18.5 T, the anomaly in the magnetic susceptibility, the slow saturation of the NMR line spectral ratio with temperature, the decrease of the NMR line split with field, and the power-law temperature dependence of 1/T1 provide evidence consistent with a spin supersolid with gapless spin excitations. Further increasing the field, the Grüneisen ratio, extracted from the MCE data, reveals a continuous quantum phase transition at HC ≈ 19.5 T and a universal quantum critical scaling with the exponents νz ≈ 1. Near HC, the large high-temperature MCE signal and the broad peaks in the NMR Knight shift and 1/T1, manifest the strong spin fluctuations driven by both magnetic frustration and quantum criticality.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"22 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685124","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

Inverse Lieb materials: altermagnetism and more 反Lieb材料：电磁学和更多

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-10 DOI: 10.1038/s41535-026-00880-w

Po-Hao Chang, Kirill D. Belashchenko, Igor I. Mazin

{"title":"Inverse Lieb materials: altermagnetism and more","authors":"Po-Hao Chang, Kirill D. Belashchenko, Igor I. Mazin","doi":"10.1038/s41535-026-00880-w","DOIUrl":"https://doi.org/10.1038/s41535-026-00880-w","url":null,"abstract":"The Lieb lattice, originally proposed for cuprate superconductors, has gained new attention in the emerging field of altermagnetism as a minimal analytical model for the latter. While the inverse Lieb lattice (ILL) was once considered purely theoretical, several materials with this motif have recently been discovered. Its unique geometry supports complex magnetic orders driven by geometric frustration, offering high tunability. In this work, we provide comprehensive insights into ILL magnetic phases and establish guidelines for identifying altermagnets. Using a Heisenberg model, we first construct phase diagrams to elucidate the mechanisms underlying experimental magnetic phases. We then bridge theory and experiment via density functional theory (DFT) calculations on existing ILL compounds, finding results consistent with experimental data. Notably, we identified a trend linking d-shell filling to magnetic order, where dx (x≤5) configurations show a propensity for altermagnetism. We also highlight Sr2CrO2Cr2OAs2 as a promising metallic altermagnet with highly anisotropic J2 exchange and a high Néel temperature (~600 K). Finally, our magnon spectra calculations confirm that chiral splittings correlate directly with anisotropies between inequivalent J2 interactions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"29 2 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147655965","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

Anisotropic multi-Q order in CoxTaS2 CoxTaS2的各向异性多q顺序

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-09 DOI: 10.1038/s41535-026-00856-w

Jonathon Kruppe, Josue Rodriguez, Catherine Xu, James Analytis, Joseph Orenstein, Veronika Sunko

引用次数: 0

Multiple topological states in LaAgAs2, a failed square-net semimetal 失效方网半金属LaAgAs2的多拓扑态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-08 DOI: 10.1038/s41535-026-00879-3

Yang Liu, Tongrui Li, Xixi Yuan, Nour Maraytta, Alexei V. Fedorov, Asish K. Kundu, Turgut Yilmaz, Elio Vescovo, Xueliang Wu, Long Zhang, Mingquan He, Yisheng Chai, Xiaoyuan Zhou, Michael Merz, Zhe Sun, Huixia Fu, Tonica Valla, Aifeng Wang

{"title":"Multiple topological states in LaAgAs2, a failed square-net semimetal","authors":"Yang Liu, Tongrui Li, Xixi Yuan, Nour Maraytta, Alexei V. Fedorov, Asish K. Kundu, Turgut Yilmaz, Elio Vescovo, Xueliang Wu, Long Zhang, Mingquan He, Yisheng Chai, Xiaoyuan Zhou, Michael Merz, Zhe Sun, Huixia Fu, Tonica Valla, Aifeng Wang","doi":"10.1038/s41535-026-00879-3","DOIUrl":"https://doi.org/10.1038/s41535-026-00879-3","url":null,"abstract":"The rational design of new materials emerges as an important direction to explore new topological materials, which is based on the understanding of the correlation between crystal and electronic structures. In this paper, we perform a comprehensive study on the crystal and electronic structures in LaAgAs2 through a combination of single-crystal x-ray diffraction (XRD), quantum oscillation, and angle-resolved photoemission spectroscopy (ARPES) experimental measurements, and density functional theory (DFT) calculations. Single-crystal XRD measurements reveal that LaAgAs2 crystallizes into a HfCuSi2-derived structure with the square net distorted into cis-trans chains. Quantum oscillation measurements reveal two frequencies with small effective masses and quasi-two-dimensional (2D) characters. ARPES measurements reveal an electronic structure strikingly different from the square-net-based semimetals, such as LaAgSb2. The Fermi surface is quasi-two-dimensional (2D), with Dirac-like hole pockets at the zone center and a quasi-1D elliptical electron pocket at the zone boundary. Based on the DFT calculations, the measured electronic structure can be well understood regarding the cis-trans distortion, which transforms the two-dimensional square net-derived Dirac bands into quasi-1D trivial bands. Intriguingly, multiple topological states can be identified around the zone center, including a nontrivial Z2 topological surface state and a bulk Dirac state. Our study clarifies the impact of cis-trans distortion and identifies LaAgAs2 as a topological material with multiple topological states near the Fermi level, providing a guideline for intentionally designing new topological materials.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"5 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631087","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

Topological altermagnetic Josephson junctions 拓扑交替约瑟夫森结

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-04-01 DOI: 10.1038/s41535-026-00874-8

Grant Z. X. Yang, Zi-Ting Sun, Ying-Ming Xie, K. T. Law

{"title":"Topological altermagnetic Josephson junctions","authors":"Grant Z. X. Yang, Zi-Ting Sun, Ying-Ming Xie, K. T. Law","doi":"10.1038/s41535-026-00874-8","DOIUrl":"https://doi.org/10.1038/s41535-026-00874-8","url":null,"abstract":"Planar Josephson junctions are pivotal for engineering topological superconductivity, yet are severely hindered by the orbital effects induced by in-plane magnetic fields, or the stray fields introduced by the use of ferromagnets. Here, we propose the generic topological altermagnetic Josephson junctions (TAJJs) as a solution to this critical problem. By leveraging the anisotropic spin-polarized band splitting and zero net magnetization attributes of altermagnets, our proposed TAJJs effectively mitigate the detrimental orbital effects while hosting Majorana zero modes (MZMs) at both ends of the junction in the complete absence of external fields. Specifically, we demonstrate that MZMs emerge robustly in ({d}_{{x}^{2}-{y}^{2}})-wave TAJJs but vanish in the dxy-wave configuration, establishing the altermagnet orientation as an intrinsic control knob of topological superconductivity. The distinct out-of-plane spin-polarization of the MZMs provides an experimental signature for the spin-resolved measurement. Furthermore, by harnessing the synergy between the ({d}_{{x}^{2}-{y}^{2}})-wave altermagnet and anisotropic superconductivity, our proposal extends naturally to high-temperature superconducting platforms. Our work establishes altermagnets as a versatile paradigm for realizing MZMs, bridging conceptual innovations with scalable quantum architectures devoid of orbital effects and stray fields.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"18 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147585912","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

Phonon thermal Hall effect: the roles of disorder, annealing, and metallic contacts 声子热霍尔效应：无序、退火和金属接触的作用

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-03-24 DOI: 10.1038/s41535-026-00876-6

Qiaochao Xiang, Xiaokang Li, Xiaodong Guo, Kamran Behnia, Zengwei Zhu

{"title":"Phonon thermal Hall effect: the roles of disorder, annealing, and metallic contacts","authors":"Qiaochao Xiang, Xiaokang Li, Xiaodong Guo, Kamran Behnia, Zengwei Zhu","doi":"10.1038/s41535-026-00876-6","DOIUrl":"https://doi.org/10.1038/s41535-026-00876-6","url":null,"abstract":"The phonon thermal Hall effect (THE) is a ubiquitous yet poorly understood phenomenon in insulators. Its microscopic origin remains debated, partly due to significant sample-dependent variations that hint at uncontrolled experimental parameters. Using SrTiO3 as a model system, we identify disorder and uncontrolled strain as suppressors of a thermal Hall signal. Crystals with high thermal conductivity exhibit a substantial thermal Hall angle ∇Ty/∇Tx (up to 0.3% at 9 T), whereas the effect is virtually absent in disordered samples. Crucially, annealing (in air atmosphere) these disordered samples partially restores the THE (~0.1% at 9 T) with little effect on the longitudinal thermal conductivity. This decoupling reveals that the amplitude of THE is not simply set by the phonon mean free path. Furthermore, measurements performed with metallic and insulating contacts yield identical results on the same sample. This definitely rules out parasitic signals as the effect’s origin. Our work, by establishing the phonon THE as an intrinsic property of the crystal lattice and extremely sensitive to disorder, sharply constrains theoretical scenarios.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"14 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147506121","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

Fermi liquid and isotropic superconductivity of Hund scenario for bilayer nickelates 双层镍酸盐的费米液体和各向同性超导

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-03-20 DOI: 10.1038/s41535-026-00871-x

Jiangfan Wang, Yi-feng Yang

引用次数: 0