npj Quantum Materials最新文献_第10页

Floquet engineering of anomalous Hall effects in monolayer MoS2 单层 MoS2 中反常霍尔效应的 Floquet 工程学

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-14 DOI: 10.1038/s41535-024-00702-x

Haijun Cao, Jia-Tao Sun, Sheng Meng

引用次数: 0

Optical properties and electronic correlations in La3Ni2O7 bilayer nickelates under high pressure 高压下 La3Ni2O7 双层镍酸盐的光学特性和电子相关性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-14 DOI: 10.1038/s41535-024-00690-y

Benjamin Geisler, Laura Fanfarillo, James J. Hamlin, Gregory R. Stewart, Richard G. Hennig, P. J. Hirschfeld

{"title":"Optical properties and electronic correlations in La3Ni2O7 bilayer nickelates under high pressure","authors":"Benjamin Geisler, Laura Fanfarillo, James J. Hamlin, Gregory R. Stewart, Richard G. Hennig, P. J. Hirschfeld","doi":"10.1038/s41535-024-00690-y","DOIUrl":"https://doi.org/10.1038/s41535-024-00690-y","url":null,"abstract":"We explore the optical properties of La3Ni2O7 bilayer nickelates by using density functional theory including a Coulomb repulsion term. Convincing agreement with recent experimental ambient-pressure spectra is achieved for U ~ 3 eV, which permits tracing the microscopic origin of the characteristic features. Simultaneous consistency with angle-resolved photoemission spectroscopy and x-ray diffraction suggests the notion of rather moderate electronic correlations in this novel high-Tc superconductor. Oxygen vacancies form predominantly at the inner apical sites and renormalize the optical spectrum quantitatively, while the released electrons are largely accommodated by a defect state. We show that the structural transition occurring under high pressure coincides with a significant enhancement of the Drude weight and a reduction of the out-of-plane interband contribution that acts as a fingerprint of the emerging hole pocket. We further calculate the optical spectra for various possible magnetic phases including spin-density waves and discuss the results in the context of experiment. Finally, we investigate the role of the 2–2 versus 1–3 layer stacking and compare the bilayer nickelate to La4Ni3O10, La3Ni2O6, and NdNiO2, unveiling general trends in the optical spectrum as a function of the formal Ni valence in Ruddlesden–Popper versus reduced Ruddlesden–Popper nickelates.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"40 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637133","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

Discovery of superconductivity and electron-phonon drag in the non-centrosymmetric Weyl semimetal LaRhGe3 在非中心对称韦尔半金属 LaRhGe3 中发现超导性和电子-声子阻力

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-09 DOI: 10.1038/s41535-024-00686-8

Mohamed Oudah, Hsiang-Hsi Kung, Samikshya Sahu, Niclas Heinsdorf, Armin Schulz, Kai Philippi, Marta-Villa De Toro Sanchez, Yipeng Cai, Kenji Kojima, Andreas P. Schnyder, Hidenori Takagi, Bernhard Keimer, Doug A. Bonn, Alannah M. Hallas

{"title":"Discovery of superconductivity and electron-phonon drag in the non-centrosymmetric Weyl semimetal LaRhGe3","authors":"Mohamed Oudah, Hsiang-Hsi Kung, Samikshya Sahu, Niclas Heinsdorf, Armin Schulz, Kai Philippi, Marta-Villa De Toro Sanchez, Yipeng Cai, Kenji Kojima, Andreas P. Schnyder, Hidenori Takagi, Bernhard Keimer, Doug A. Bonn, Alannah M. Hallas","doi":"10.1038/s41535-024-00686-8","DOIUrl":"https://doi.org/10.1038/s41535-024-00686-8","url":null,"abstract":"We present an exploration of the effect of electron-phonon coupling and broken inversion symmetry on the electronic and thermal properties of the semimetal LaRhGe3. Our transport measurements reveal evidence for electron-hole compensation at low temperatures, resulting in a large magnetoresistance of 3000% at 1.8 K and 14 T. The carrier concentration is on the order of 1021/cm3 with high carrier mobilities of 2000 cm2/Vs. When coupled to our theoretical demonstration of symmetry-protected almost movable Weyl nodal lines, we conclude that LaRhGe3 supports a Weyl semimetallic state. We discover superconductivity in this compound with a Tc of 0.39(1) K and Bc(0) of 2.2(1) mT, with evidence from specific heat and transverse-field muon spin relaxation. We find an exponential dependence in the normal state electrical resistivity below ~50 K, while Seebeck coefficient and thermal conductivity measurements each reveal a prominent peak at low temperatures, indicative of strong electron-phonon interactions. To this end, we examine the temperature-dependent Raman spectra of LaRhGe3 and find that the lifetime of the lowest energy A1 phonon is dominated by phonon-electron scattering instead of anharmonic decay. We conclude that LaRhGe3 has strong electron-phonon coupling in the normal state, while the superconductivity emerges from weak electron-phonon coupling. These results open up the investigation of electron-phonon interactions in the normal state of superconducting non-centrosymmetric Weyl semimetals.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"5 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597169","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

Pseudospins revealed through the giant dynamical Franz-Keldysh effect in massless Dirac materials 通过无质量狄拉克材料中的巨动力学弗兰兹-凯尔迪什效应揭示伪自旋

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-07 DOI: 10.1038/s41535-024-00701-y

Youngjae Kim

{"title":"Pseudospins revealed through the giant dynamical Franz-Keldysh effect in massless Dirac materials","authors":"Youngjae Kim","doi":"10.1038/s41535-024-00701-y","DOIUrl":"https://doi.org/10.1038/s41535-024-00701-y","url":null,"abstract":"The dynamical Franz-Keldysh effect, indicative of the transient light-matter interaction regime between quantum and classical realms, is widely recognized as an essential signature in wide bandgap condensed matter systems such as dielectrics. In this theoretical study, we applied time-resolved transient absorption spectroscopy to investigate ultrafast optical responses in graphene, a zero-bandgap system. We observed in the gate-tuned graphene that the massless Dirac materials notably enhance intraband light-driven transitions, significantly leading to the giant dynamical Franz-Keldysh effect compared to the massive Dirac materials, a wide bandgap system. In addition, employing the angle-resolved spectroscopy, it is found that the unique polarimetry orientation, i.e., perpendicular polarizations for the pump and the probe, further pronounces the optical spectra to exhibit the complete fishbone structure, reflecting quantum pseudospin natures of Dirac cones. Our findings expand the establishment of emergent transient spectroscopy frameworks into not only zero-bandgap systems but also pseudospin-mediated quantum phenomena, moving beyond dielectrics.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"33 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597172","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

Exploring ground states of Fermi-Hubbard model on honeycomb lattices with counterdiabaticity 探索具有反绝热性的蜂巢晶格上费米-哈伯德模型的基态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-07 DOI: 10.1038/s41535-024-00697-5

Jialiang Tang, Ruoqian Xu, Yongcheng Ding, Xusheng Xu, Yue Ban, Man-Hong Yung, Axel Pérez-Obiol, Gloria Platero, Xi Chen

{"title":"Exploring ground states of Fermi-Hubbard model on honeycomb lattices with counterdiabaticity","authors":"Jialiang Tang, Ruoqian Xu, Yongcheng Ding, Xusheng Xu, Yue Ban, Man-Hong Yung, Axel Pérez-Obiol, Gloria Platero, Xi Chen","doi":"10.1038/s41535-024-00697-5","DOIUrl":"https://doi.org/10.1038/s41535-024-00697-5","url":null,"abstract":"Exploring the ground state properties of many-body quantum systems conventionally involves adiabatic processes, alongside exact diagonalization, in the context of quantum annealing or adiabatic quantum computation. Shortcuts to adiabaticity by counter-diabatic driving serve to accelerate these processes by suppressing energy excitations. Motivated by this, we develop variational quantum algorithms incorporating the auxiliary counter-diabatic interactions, comparing them with digitized adiabatic algorithms. These algorithms are then implemented on gate-based quantum circuits to explore the ground states of the Fermi-Hubbard model on honeycomb lattices, utilizing systems with up to 26 qubits. The comparison reveals that the counter-diabatic inspired ansatz is superior to traditional Hamiltonian variational ansatz. Furthermore, the number and duration of Trotter steps are analyzed to understand and mitigate errors. Given the model’s relevance to materials in condensed matter, our study paves the way for using variational quantum algorithms with counterdiabaticity to explore quantum materials in the noisy intermediate-scale quantum era.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"62 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597173","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

Observation of floating surface state in obstructed atomic insulator candidate NiP2 观测受阻原子绝缘体候选物质 NiP2 的浮面状态

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-02 DOI: 10.1038/s41535-024-00699-3

Xiang-Rui Liu, Ming-Yuan Zhu, Yuanwen Feng, Meng Zeng, Xiao-Ming Ma, Yu-Jie Hao, Yue Dai, Rong-Hao Luo, Yu-Peng Zhu, Kohei Yamagami, Yi Liu, Shengtao Cui, Zhe Sun, Jia-Yu Liu, Yu Huang, Zhengtai Liu, Mao Ye, Dawei Shen, Bing Li, Chang Liu

{"title":"Observation of floating surface state in obstructed atomic insulator candidate NiP2","authors":"Xiang-Rui Liu, Ming-Yuan Zhu, Yuanwen Feng, Meng Zeng, Xiao-Ming Ma, Yu-Jie Hao, Yue Dai, Rong-Hao Luo, Yu-Peng Zhu, Kohei Yamagami, Yi Liu, Shengtao Cui, Zhe Sun, Jia-Yu Liu, Yu Huang, Zhengtai Liu, Mao Ye, Dawei Shen, Bing Li, Chang Liu","doi":"10.1038/s41535-024-00699-3","DOIUrl":"https://doi.org/10.1038/s41535-024-00699-3","url":null,"abstract":"Obstructed atomic insulator is recently proposed as an unconventional material, in which electric charge centers localized at sites away from the atoms. A half-filling surface state would emerge at specific interfaces cutting through these charge centers and avoid intersecting any atoms. In this article, we utilized photoemission spectroscopy and density functional theory calculations to study one of the obstructed atomic insulator candidates, NiP2. A floating surface state with large effective mass that is close to the Fermi level and isolated from all bulk states is resolved on the (100) cleavage plane, implying better catalytic activity in this plane than the previously studied surfaces. Density functional theory calculation results elucidate that this floating surface state is originated from the obstructed Wannier charge centers, albeit underwent surface reconstruction. Our findings not only shed lights on the study of obstructed atomic insulators, but also provide possible route for development of new catalysts.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"4 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142566128","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

Reentrant multiple-q magnetic order and a “spin meta-cholesteric” phase in Sr3Fe2O7 Sr3Fe2O7 中的同向多 Q 磁序和 "自旋元胆甾 "相

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-10-26 DOI: 10.1038/s41535-024-00698-4

N. D. Andriushin, J. Muller, N. S. Pavlovskii, J. Grumbach, S. Granovsky, Y. V. Tymoshenko, O. Zaharko, A. Ivanov, J. Ollivier, M. Doerr, B. Keimer, M. Mostovoy, D. S. Inosov, D. C. Peets

{"title":"Reentrant multiple-q magnetic order and a “spin meta-cholesteric” phase in Sr3Fe2O7","authors":"N. D. Andriushin, J. Muller, N. S. Pavlovskii, J. Grumbach, S. Granovsky, Y. V. Tymoshenko, O. Zaharko, A. Ivanov, J. Ollivier, M. Doerr, B. Keimer, M. Mostovoy, D. S. Inosov, D. C. Peets","doi":"10.1038/s41535-024-00698-4","DOIUrl":"https://doi.org/10.1038/s41535-024-00698-4","url":null,"abstract":"Topologically nontrivial magnetic structures such as skyrmion lattices are well known in materials lacking lattice inversion symmetry, where antisymmetric exchange interactions are allowed. Only recently, topological multi-q magnetic textures that spontaneously break the chiral symmetry, for example, three-dimensional hedgehog lattices, were discovered in centrosymmetric compounds, where they are instead driven by frustrated interactions. Here we show that the bilayer perovskite Sr3Fe2O7, previously believed to adopt a simple single-q spin-helical order, hosts two distinct types of multi-q spin textures. Its ground state represents a novel multi-q spin texture with unequally intense spin modulations at the two ordering vectors. This is followed in temperature by a new “spin meta-cholesteric” phase, in which the chiral symmetry is spontaneously broken along one of the crystal directions, but the weaker orthogonal modulation melts, giving rise to intense short-range dynamical fluctuations. Shortly before the transition to the paramagnetic state, vortex-crystal order spanned by two equivalent q vectors emerges. This renders Sr3Fe2O7 an ideal material to study transitions among multiple-q spin textures in a centrosymmetric host.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"7 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142490625","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

Doubled Shapiro steps in a dynamic axion insulator Josephson junction 动态轴向绝缘体约瑟夫森结中的双夏皮罗阶跃

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-10-23 DOI: 10.1038/s41535-024-00692-w

Yu-Hang Li, Zi-Qian Zhou, Ran Cheng, Hua Jiang, X. C. Xie

引用次数: 0

Nonreciprocal nonlinear responses in moving charge density waves 移动电荷密度波中的非互易非线性响应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-10-21 DOI: 10.1038/s41535-024-00695-7

Ying-Ming Xie, Hiroki Isobe, Naoto Nagaosa

引用次数: 0

Raman-phonon-polariton condensation in a transversely pumped cavity 横向泵浦腔中的拉曼-声子-极化子凝聚

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-10-17 DOI: 10.1038/s41535-024-00693-9

Alexander N. Bourzutschky, Benjamin L. Lev, Jonathan Keeling

{"title":"Raman-phonon-polariton condensation in a transversely pumped cavity","authors":"Alexander N. Bourzutschky, Benjamin L. Lev, Jonathan Keeling","doi":"10.1038/s41535-024-00693-9","DOIUrl":"https://doi.org/10.1038/s41535-024-00693-9","url":null,"abstract":"Phonon polaritons are hybrid states of light and matter that are typically realised when optically active phonons couple strongly to photons. We suggest a new approach to realising phonon polaritons, by employing a transverse-pumping Raman scheme, as used in experiments on cold atoms in optical cavities. This approach allows hybridisation between an optical cavity mode and any Raman-active phonon mode. Moreover, this approach enables one to tune the effective phonon–photon coupling by changing the strength of the transverse pumping light. We show that such a system may realise a phonon-polariton condensate. To do this, we find the stationary states and use Floquet theory to determine their stability. We thus identify distinct superradiant and lasing states in which the polariton modes are macroscopically populated. We map out the phase diagram of these states as a function of pump frequencies and strengths. Using parameters for transition metal dichalcogenides, we show that realisation of these phases may be practicably obtainable. The ability to manipulate phonon mode frequencies and attain steady-state populations of selected phonon modes provides a new tool for engineering correlated states of electrons.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"5 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142448099","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