npj Quantum Materials最新文献

Laterally extended states of interlayer excitons in reconstructed MoSe2/WSe2 heterostructures 重建MoSe2/WSe2异质结构中层间激子的横向扩展态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-09-16 DOI: 10.1038/s41535-025-00820-0

Johannes Figueiredo, Marten Richter, Mirco Troue, Jonas Kiemle, Hendrik Lambers, Torsten Stiehm, Takashi Taniguchi, Kenji Watanabe, Ursula Wurstbauer, Andreas Knorr, Alexander W. Holleitner

{"title":"Laterally extended states of interlayer excitons in reconstructed MoSe2/WSe2 heterostructures","authors":"Johannes Figueiredo, Marten Richter, Mirco Troue, Jonas Kiemle, Hendrik Lambers, Torsten Stiehm, Takashi Taniguchi, Kenji Watanabe, Ursula Wurstbauer, Andreas Knorr, Alexander W. Holleitner","doi":"10.1038/s41535-025-00820-0","DOIUrl":"https://doi.org/10.1038/s41535-025-00820-0","url":null,"abstract":"Heterostructures made from 2D transition-metal dichalcogenides are known as ideal platforms to explore excitonic phenomena ranging from correlated moiré excitons to degenerate interlayer exciton ensembles. So far, it is assumed that the atomic reconstruction appearing in some of the heterostructures gives rise to a dominating localization of the exciton states. We demonstrate that the center-of-mass wavefunction of the excitonic states in reconstructed MoSe2/WSe2 heterostructures can extend well beyond the moiré periodicity of the investigated heterostructures. The results are based on real-space calculations yielding a lateral potential map for interlayer excitons within the strain-relaxed heterostructures with weak random disorder, as expected for realistic samples, and the corresponding real-space center-of-mass excitonic wavefunctions. We combine the theoretical results with cryogenic photoluminescence experiments, which support the computed level structure and relaxation characteristics of the interlayer excitons.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"28 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145067918","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

Origin and stability of generalized Wigner crystallinity in triangular moiré systems 三角摩尔体系中广义Wigner结晶度的起源和稳定性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-28 DOI: 10.1038/s41535-025-00792-1

Aman Kumar, Cyprian Lewandowski, Hitesh J. Changlani

引用次数: 0

Spin-glass state in nickelate superconductors 镍酸盐超导体中的自旋玻璃态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-28 DOI: 10.1038/s41535-025-00813-z

David R. Saykin, Martin Gonzalez, Jennifer Fowlie, Steven A. Kivelson, Harold Y. Hwang, Aharon Kapitulnik

引用次数: 0

Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor 强欠掺杂模型铜超导体的间隙相称反铁磁响应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-20 DOI: 10.1038/s41535-025-00804-0

Z. W. Anderson, Y. Tang, V. Nagarajan, M. K. Chan, C. J. Dorow, G. Yu, D. L. Abernathy, A. D. Christianson, L. Mangin-Thro, P. Steffens, T. Sterling, D. Reznik, D. Bounoua, Y. Sidis, P. Bourges, M. Greven

{"title":"Gapped commensurate antiferromagnetic response in a strongly underdoped model cuprate superconductor","authors":"Z. W. Anderson, Y. Tang, V. Nagarajan, M. K. Chan, C. J. Dorow, G. Yu, D. L. Abernathy, A. D. Christianson, L. Mangin-Thro, P. Steffens, T. Sterling, D. Reznik, D. Bounoua, Y. Sidis, P. Bourges, M. Greven","doi":"10.1038/s41535-025-00804-0","DOIUrl":"https://doi.org/10.1038/s41535-025-00804-0","url":null,"abstract":"It is a distinct possibility that spin fluctuations are the pairing interactions in numerous unconventional superconductors. In the high-transition-temperature (high-Tc) cuprates, superconductivity emerges upon doping antiferromagnetic Mott insulators, and spin fluctuations might furthermore drive unusual pseudogap phenomena. Here we use magnetic neutron scattering to study the highly underdoped cuprate HgBa2CuO4+δ (hole concentration p ≈ 0.064). In contrast to prior results for other underdoped cuprates, we find no evidence of incommensurate magnetic order associated with spin-density-wave or stripe correlations. Instead, the antiferromagnetic response in both the superconducting and pseudogap states is gapped below ΔAF ≈ 6 meV, commensurate over a wide energy range, and disperses above about 55 meV. Given the pristine nature of HgBa2CuO4+δ, which exhibits high structural symmetry and minimal point disorder effects, this behavior likely signifies the unmasked response of the underlying CuO2 planes near the Mott-insulating state. These results serve as a benchmark for a refined theoretical understanding of the cuprates.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"18 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144901610","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

Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures TaS2三层异质结构的平带、局域和流动态设计

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-19 DOI: 10.1038/s41535-025-00812-0

Hyeonhu Bae, Roser Valentí, Igor I. Mazin, Binghai Yan

引用次数: 0

Distinct terahertz nonlinear and Raman responses in cuprate superconductors Bi2Sr2CaCu2O8+x 铜超导体Bi2Sr2CaCu2O8+x中不同的太赫兹非线性和拉曼响应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-18 DOI: 10.1038/s41535-025-00807-x

Kota Katsumi, Yann Gallais, Ryo Shimano

{"title":"Distinct terahertz nonlinear and Raman responses in cuprate superconductors Bi2Sr2CaCu2O8+x","authors":"Kota Katsumi, Yann Gallais, Ryo Shimano","doi":"10.1038/s41535-025-00807-x","DOIUrl":"https://doi.org/10.1038/s41535-025-00807-x","url":null,"abstract":"Nonlinear light-matter interaction at low energy, particularly in the terahertz (THz) frequency range, hosts unique phenomena distinct from the optical excitation with photon energy of a few eV. In cuprate superconductors Bi2Sr2CaCu2O8+x, the THz nonlinear response is identified via the optical reflectivity change and interpreted as the amplitude mode of the superconducting condensate, namely the Higgs mode [K. Katsumi et al., Phys. Rev. Lett. 120, 117001 (2018)]. However, the origin of the THz nonlinearity has been questioned because the pair-breaking process, identified in Raman spectroscopy, can also contribute to it. Here, we reexamined the THz-driven nonequilibrium dynamics in cuprates Bi2Sr2CaCu2O8+x by comparing it with the Raman susceptibility. In the optical reflectivity change, we found an oscillatory behavior following the squared THz waveform (THz Kerr signal), as well as the relaxation of the quasiparticle excitation. Careful insight into the data revealed that the oscillatory and decaying contributions exhibit different doping dependence. Remarkably, the doping and temperature evolutions of the THz Kerr signal are distinct from those of the Raman susceptibility, which is described by the pair-breaking due to diamagnetic light–matter interaction. These results indicate the importance of the paramagnetic light–matter coupling in the THz Kerr signal in the cuprate superconductors, likely arising from the Higgs mode.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"9 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144901642","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

Quantum spin liquid phases in Kitaev materials 基塔耶夫材料中的量子自旋液相

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-16 DOI: 10.1038/s41535-025-00811-1

Po-Hao Chou, Chung-Yu Mou, Chung-Hou Chung, Sungkit Yip

引用次数: 0

Ferroelectric switching of quantum anomalous Hall effects in MnBi2Te4 films MnBi2Te4薄膜中量子反常霍尔效应的铁电开关

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-15 DOI: 10.1038/s41535-025-00800-4

Jiaheng Li, Quansheng Wu, Hongming Weng

引用次数: 0

Ramification of complex magnetism in Nd2Ir2O7 observed by Raman scattering spectroscopy 用拉曼散射光谱观察Nd2Ir2O7中复磁性的分支

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-13 DOI: 10.1038/s41535-025-00806-y

Yuanyuan Xu, Yang Yang, Jérémie Teyssier, Takumi Ohtsuki, Yang Qiu, Satoru Nakatsuji, Dirk van der Marel, Natalia B. Perkins, Natalia Drichko

{"title":"Ramification of complex magnetism in Nd2Ir2O7 observed by Raman scattering spectroscopy","authors":"Yuanyuan Xu, Yang Yang, Jérémie Teyssier, Takumi Ohtsuki, Yang Qiu, Satoru Nakatsuji, Dirk van der Marel, Natalia B. Perkins, Natalia Drichko","doi":"10.1038/s41535-025-00806-y","DOIUrl":"https://doi.org/10.1038/s41535-025-00806-y","url":null,"abstract":"Using Raman scattering spectroscopy, we uncover a complex magnetic behavior of Nd2Ir2O7, which stands out among magnetic pyrochlores by the lowest temperature of the all-in-all-out (AIAO) Ir moments ordering (({T}_{{rm{Ir}}}^{{rm{N}}}=33) K) and the highest temperature at which AIAO order of rare-earth Nd ions is detected (({T}_{{rm{Nd}}}^{{rm{* }}})=15 K). Detected magnetic Raman scattering and calculations of expected response allow us to demonstrate that the ordering of Ir magnetic moments is accompanied by an appearance of one-magnon Raman modes at 26.3 and 29.6 meV compatible with the AIAO order and allowing to estimate the energies of Ir-Ir interactions. An additional two-magnon excitation of the AIAO Nd order at around 33 meV appears in the spectra below the ordering temperature of Nd moments ({T}_{{rm{Nd}}}^{{rm{* }}})=15 K. In the temperature range between 15 K and 33 K we observe a broad mode, which demonstrates strong temperature dependence and shifts on cooling below 20 K from 14 meV to higher frequencies, and disappears at 5 K, when two-magnon excitation of Nd moments becomes prominent. We suggest an interpretation of this excitation in terms of continuum arising from collective fluctuations of Nd moments above the transition. This complex behavior emerges from the interplay of strong spin-orbit coupling, electronic correlations, and geometric frustration on two magnetic pyrochlore sublattices of Nd and Ir ions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"6 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825357","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

Interaction of magnetic fields with spinons in a fractionalized state 分数态下磁场与自旋子的相互作用

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2025-08-08 DOI: 10.1038/s41535-025-00809-9

Yu Zhang, Hengdi Zhao, Tristan R. Cao, Rahul Nandkishore, Pedro Schlottmann, Lance De Long, Gang Cao

{"title":"Interaction of magnetic fields with spinons in a fractionalized state","authors":"Yu Zhang, Hengdi Zhao, Tristan R. Cao, Rahul Nandkishore, Pedro Schlottmann, Lance De Long, Gang Cao","doi":"10.1038/s41535-025-00809-9","DOIUrl":"https://doi.org/10.1038/s41535-025-00809-9","url":null,"abstract":"The 4d-electron trimer lattice Ba₄Nb₁₋ₓRu₃₊ₓO₁₂ exhibits either a quantum spin liquid (QSL) or a heavy-fermion strange metal (HFSM) phase, depending on Nb content. In the QSL state, itinerant spinons act as effective heat carriers, enhancing thermal conductivity. Strikingly, applying a magnetic field up to 14 T causes an abrupt, up-to-5000% increase in heat capacity below 150 mK, disrupting the linear temperature dependence typical of both phases. Meanwhile, AC susceptibility and electrical resistivity remain nearly unchanged, while thermal conductivity drops by up to 40% below 4 K. These results suggest spinons, despite being charge-neutral, are highly sensitive to magnetic fields at low temperatures. We propose that the magnetic field could induce Anderson localization of spinons, creating emergent non-magnetic two-level systems responsible for the Schottky-like anomaly in heat capacity. These findings point to a previously unexplored regime of spinon dynamics, potentially governed by field-induced localization and distinct from conventional magnetic or transport signatures.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"17 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797092","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