npj Quantum Materials最新文献

Optical properties, plasmons, and orbital Skyrme textures in twisted TMDs 扭曲tmd中的光学特性、等离子体和轨道Skyrme织构

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-18 DOI: 10.1038/s41535-025-00771-6

Lorenzo Cavicchi, Koen J. A. Reijnders, Mikhail I. Katsnelson, Marco Polini

引用次数: 0

Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite 缺氧双钙钛矿中W5+自旋的对称介导量子相干性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-18 DOI: 10.1038/s41535-025-00782-3

Shannon Bernier, Mekhola Sinha, Tyler J. Pearson, Peter V. Sushko, Paul H. Oyala, Maxime A. Siegler, W. Adam Phelan, Abby N. Neill, Danna E. Freedman, Tyrel M. McQueen

{"title":"Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite","authors":"Shannon Bernier, Mekhola Sinha, Tyler J. Pearson, Peter V. Sushko, Paul H. Oyala, Maxime A. Siegler, W. Adam Phelan, Abby N. Neill, Danna E. Freedman, Tyrel M. McQueen","doi":"10.1038/s41535-025-00782-3","DOIUrl":"https://doi.org/10.1038/s41535-025-00782-3","url":null,"abstract":"Elucidating the factors limiting quantum coherence in real materials is essential to the development of quantum technologies. Here we report a strategic approach to determine the effect of lattice dynamics on spin coherence lifetimes using oxygen deficient double perovskites as host materials. In addition to obtaining millisecond T1 spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that T2 enhancement in Sr2CaWO6-δ over previously studied Ba2CaWO6-δ is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as W5+ via electron paramagnetic resonance spectroscopy. Further, a combination of experimental and computational techniques enabled quantification of the relative strength of spin-phonon coupling of each phonon mode. This analysis demonstrates the effect of thermodynamics and site symmetry on the spin lifetimes of W5+ paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"232 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144311797","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-orbital excitations encoding the magnetic phase transition in the van der Waals antiferromagnet FePS3 范德华反铁磁体FePS3中编码磁相变的自旋轨道激发

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-17 DOI: 10.1038/s41535-025-00777-0

Yuan Wei, Yi Tseng, Hebatalla Elnaggar, Wenliang Zhang, Teguh Citra Asmara, Eugenio Paris, Gabriele Domaine, Vladimir N. Strocov, Luc Testa, Virgile Favre, Mario Di Luca, Mitali Banerjee, Andrew R. Wildes, Frank M. F. de Groot, Henrik M. Rønnow, Thorsten Schmitt

{"title":"Spin-orbital excitations encoding the magnetic phase transition in the van der Waals antiferromagnet FePS3","authors":"Yuan Wei, Yi Tseng, Hebatalla Elnaggar, Wenliang Zhang, Teguh Citra Asmara, Eugenio Paris, Gabriele Domaine, Vladimir N. Strocov, Luc Testa, Virgile Favre, Mario Di Luca, Mitali Banerjee, Andrew R. Wildes, Frank M. F. de Groot, Henrik M. Rønnow, Thorsten Schmitt","doi":"10.1038/s41535-025-00777-0","DOIUrl":"https://doi.org/10.1038/s41535-025-00777-0","url":null,"abstract":"Van der Waals (vdW) materials are featuring intertwined electronic order and collective phenomena. Elucidating the dynamics of the elementary excitations within the fundamental electronic degrees of freedom is of paramount importance. Here we performed resonant inelastic X-ray scattering (RIXS) to elaborate the spin-orbital excitations of the vdW antiferromagnet FePS3 and their role for magnetism. We observed the spectral enhancement of spin-orbital multiplet excitations at about ~100 and ~220 meV, as well as the quasielastic response, when entering the antiferromagnetic phase with an order-parameter-like evolution in temperature. By comparing with model calculations, we discovered the trigonal lattice distortion, spin-orbit interaction and metal-ligand charge-transfer to be essential for these emergent excitations. We further reveal their spectral robustness down to the few atomic-layer limit by mechanical exfoliation, in accordance with the persistent antiferromagnetism reported previously. Our study highlights the crucial role of lattice and orbital anisotropy for stabilizing the quasi-two-dimensional magnetism and tailoring vdW magnets.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"605 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305460","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 inversion and emergent lattice dynamics in infinite layer CaCoO2 无限层CaCoO2的轨道反演和涌现晶格动力学

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-16 DOI: 10.1038/s41535-025-00778-z

Daniel Jost, Eder G. Lomeli, Woo Jin Kim, Emily M. Been, Matteo Rossi, Stefano Agrestini, Ke-Jin Zhou, Chunjing Jia, Brian Moritz, Zhi-Xun Shen, Harold Y. Hwang, Thomas P. Devereaux, Wei-Sheng Lee

引用次数: 0

Probing chiral Kitaev spin liquids via dangling boundary fermions 利用悬垂边界费米子探测手性基塔耶夫自旋液体

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-14 DOI: 10.1038/s41535-025-00770-7

Shang-Shun Zhang, Gábor B. Halász, Cristian D. Batista

引用次数: 0

Pressure-induced structural phase transitions in CrSBr CrSBr中压力诱导的结构相变

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-11 DOI: 10.1038/s41535-025-00767-2

Luther J. Langston, Alberto M. Ruiz, Carla Boix-Constant, Samuel Mañas-Valero, Eugenio Coronado, José J. Baldoví, Zhenxian Liu, Janice L. Musfeldt

{"title":"Pressure-induced structural phase transitions in CrSBr","authors":"Luther J. Langston, Alberto M. Ruiz, Carla Boix-Constant, Samuel Mañas-Valero, Eugenio Coronado, José J. Baldoví, Zhenxian Liu, Janice L. Musfeldt","doi":"10.1038/s41535-025-00767-2","DOIUrl":"https://doi.org/10.1038/s41535-025-00767-2","url":null,"abstract":"There is growing interest in combining chemical complexity with external stimuli like pressure, field, and light for property control in van der Waals solids. This is because extreme conditions trigger the development of new states of matter and functionality. In this work, we bring together synchrotron-based infrared absorption, Raman scattering, and diamond anvil cell techniques with first-principles calculations of the lattice dynamics and energy landscape to reveal the series of structural phase transitions in CrSBr. By tracking how the phonons change under pressure, we uncover a remarkable chain of complex symmetry modifications, interlayer interactions, and chemical reactions. A group-subgroup analysis suggests that CrSBr undergoes an orthorhombic Pmmn → monoclinic P2/m transition at 7.6 GPa, and based upon a comparison with model oxychlorides like FeOCl and CrOCl, we propose that changes in the pendant halide groups drive the system to a P21/m-like space group above 15.3 GPa. Compression above 20.2 GPa is irreversible, resulting in the formation of an entirely new compound that is metastable for months. This work opens the door to the use of pressure and possibly strain to control the properties of CrSBr.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"173 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260215","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

Anomalous currents and spontaneous vortices in spin-orbit coupled superconductors 自旋轨道耦合超导体中的异常电流和自发涡流

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-11 DOI: 10.1038/s41535-025-00773-4

Benjamin A. Levitan, Yuval Oreg, Erez Berg

引用次数: 0

Direct visualization of a disorder driven electronic smectic phase in nonsymmorphic square-net semimetal GdSbTe 非对称方网半金属GdSbTe中无序驱动电子半晶相的直接可视化

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-06-07 DOI: 10.1038/s41535-025-00779-y

Balaji Venkatesan, Syu-You Guan, Jen-Te Chang, Shiang-Bin Chiu, Po-Yuan Yang, Chih-Chuan Su, Tay-Rong Chang, Kalaivanan Raju, Raman Sankar, Somboon Fongchaiya, Ming-Wen Chu, Chia-Seng Chang, Guoqing Chang, Hsin Lin, Adrian Del Maestro, Ying-Jer Kao, Tien-Ming Chuang

{"title":"Direct visualization of a disorder driven electronic smectic phase in nonsymmorphic square-net semimetal GdSbTe","authors":"Balaji Venkatesan, Syu-You Guan, Jen-Te Chang, Shiang-Bin Chiu, Po-Yuan Yang, Chih-Chuan Su, Tay-Rong Chang, Kalaivanan Raju, Raman Sankar, Somboon Fongchaiya, Ming-Wen Chu, Chia-Seng Chang, Guoqing Chang, Hsin Lin, Adrian Del Maestro, Ying-Jer Kao, Tien-Ming Chuang","doi":"10.1038/s41535-025-00779-y","DOIUrl":"https://doi.org/10.1038/s41535-025-00779-y","url":null,"abstract":"Electronic liquid crystal (ELC) phases are spontaneous symmetry breaking states believed to arise from strong electron correlation in quantum materials such as cuprates and iron pnictides. Here, we report a direct observation of a smectic phase in a weakly correlated nonsymmorphic square-net semimetal GdSbxTe2-x. Incommensurate smectic charge modulation and intense local unidirectional nanostructure, which coexist with Dirac fermions across Fermi level, are visualized by using spectroscopic imaging—scanning tunneling microscopy. As materials with highly mobile carriers are mostly weakly correlated, the discovery of such an ELC phase are anomalous and raise questions on the origin of their emergence. Specifically, we demonstrate how chemical substitution generates these symmetry breaking phases before the system undergoes a charge density wave (CDW)—orthorhombic structural transition. Our results highlight the importance of impurities in realizing ELC phases and present a new material platform for exploring the interplay among quenched disorder, Dirac fermions and electron correlation.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"170 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237404","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

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