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Discovery of d-orbital order in Tb2CoAl4Ge2
Zhanyang Hao, Haohao Sheng, Wanru Ma +32
Orbital order describes a quantum state where occupied orbitals line up in a periodic pattern. While orbital physics plays a fundamental and universal role in strongly correlated e…
Cascade of magnetic-field-induced quantum spin states in a spin-1 honeycomb magnet
Kaixin Tang, Zhao-Yang Dong, Yanyan Shangguan +10
Quantum fluctuations endow spin systems with surprisingly enriched magnetic phase diagrams. In frustrated magnets, strong quantum fluctuations boosted by either geometrical incompa…
Abnormally enhanced Hall Lorenz number in the magnetic Weyl semimetal NdAlSi
Nan Zhang, Daifeng Tu, Ding Li +9
In Landau's celebrated Fermi liquid theory, electrons in a metal obey the Wiedemann--Franz law at the lowest temperatures. This law states that electron heat and charge transport a…
Unraveling Intertwined Orders in the Strongly Correlated Kagome Metal CsCr3Sb5
Liangyang Liu, Yidian Li, Hengxin Tan +11
While correlated phenomena of flat bands have been extensively studied in twisted systems, the ordered states that emerge from interactions in the intrinsic flat bands of kagome la…
Large Oscillatory Thermal Hall Effect in Kagome Metals
Dechen Zhang, Kuan-Wen Chen, Guoxin Zheng +9
The thermal Hall effect recently provided intriguing probes to the ground state of exotic quantum matters. These observations of transverse thermal Hall signals lead to the debate…
Spin freezing induced giant exchange bias in a doped Hund's metal
S. J. Li, D. Zhao, J. Li +6
Exchange bias (EB) is a fundamental phenomenon in widespread information technologies. However, a comprehensive understanding of its microscopic origin remains a great challenge. O…
Evidence for Unfolded Fermi Surfaces in the Charge-Density-Wave State of Kagome Metal FeGe Revealed by de Haas-van Alphen Effect
Kaixin Tang, Hanjing Zhou, Houpu Li +10
The antiferromagnetic kagome lattice compound FeGe has been revealed to host an emergent charge-density-wave (CDW) state which manifests complex interplay between the spin, charge…
Magnetic-field-induced electronic instability of Weyl-like fermions in compressed black phosphorus
Lixuan Zheng, Kaifa Luo, Zeliang Sun +14
Revealing the role of Coulomb interaction in topological semimetals with Dirac/Weyl-like band dispersion shapes a new frontier in condensed matter physics. Topological node-line se…
Temperature-Dependent and Magnetism-Controlled Fermi Surface Changes in Magnetic Weyl Semimetals
Nan Zhang, Xianyong Ding, Fangyang Zhan +10
The coupling between band structure and magnetism can lead to intricate Fermi surface modifications. Here we report on the comprehensive study of the Shubnikov-de Haas (SdH) effect…
Pressure-induced transition from a Mott insulator to a ferromagnetic Weyl metal in La2O3Fe2Se2
Ye Yang, Fanghang Yu, Xikai Wen +6
The insulator-metal transition in Mott insulators, known as the Mott transition, is usually accompanied with various novel quantum phenomena, such as unconventional superconductivi…
Metal to Mott Insulator Transition in Two-dimensional 1T-TaSe
Ning Tian, Zhe Huang, Bo Gyu Jang +17
When electron-electron interaction dominates over other electronic energy scales, exotic, collective phenomena often emerge out of seemingly ordinary matter. The strongly correlate…
Fluctuating magnetic droplets immersed in a sea of quantum spin liquid
Z. H. Zhu, B. L. Pan, L. P. Nie +12
The search of quantum spin liquid (QSL), an exotic magnetic state with strongly-fluctuating and highly-entangled spins down to zero temperature, is a main theme in current condense…
Emergence of Quantum Confinement in Topological Kagome Superconductor CsVSb family
Yongqing Cai, Yuan Wang, Zhanyang Hao +19
Quantum confinement is a restriction on the motion of electrons in a material to specific region, resulting in discrete energy levels rather than continuous energy bands. In certai…
Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
Z. Xiang, B. Lawson, T. Asaba +5
Kondo insulator samarium hexaboride (SmB6) has been intensely studied in recent years as a potential candidate of a strongly correlated topological insulator. One of the most excit…
Large magnetic anisotropy in single crystals
G. Wu, B. L. Kang, Y. L. Li +6
In intercalated transition metal dichalcogenide (0.2 x 0.4) single crystals, large magnetic anisotropy is observed. Transport property measurements indica…
Unveiling the Charge Density Wave Inhomogeneity and Pseudogap State in 1T-TiSe2
Kai-Wen Zhang, Chao-Long Yang, Bin Lei +8
By using scanning tunneling microscopy (STM) / spectroscopy (STS), we systematically characterize the electronic structure of lightly doped 1T-TiSe2, and demonstrate the existence…
Orbital-driven Mottness collapse in 1T-TaS2-xSex transition metal dichalcogenide
Shuang Qiao, Xintong Li, Naizhou Wang +9
The vicinity of a Mott insulating phase has constantly been a fertile ground for finding exotic quantum states, most notably the high Tc cuprates and colossal magnetoresistance man…
Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study
Y. Xu, S. Cui, J. K. Dong +6
Recently there have been increasingly hot debates on whether a bulk Fermi surface of charge-neutral excitations exists in the topological Kondo insulator SmB6. To unambiguously res…
Hydrostatic pressure induced Dirac semimetal in black phosphorus
Peng-Lai Gong, Da-Yong Liu, Kai-Shuai Yan +4
Motivated by recent experimental observation of an hydrostatic pressure induced transition from semiconductor to semimetal in black phosphorus [Chen et al. in arXiv:1504.00125], we…
Fermi Arcs vs. Fermi Pockets in Electron-doped Perovskite Iridates
Junfeng He, H. Hafiz, Thomas R. Mion +11
We report on an angle resolved photoemission (ARPES) study of bulk electron-doped perovskite iridate, (Sr1-xLax)3Ir2O7. Fermi surface pockets are observed with a total electron cou…
Angle-resolved Photoemission Spectroscopy Study on the Surface States of the Correlated Topological Insulator YbB6
M. Xia, J. Jiang, Z. R. Ye +10
We report the electronic structure of YbB6, a recently predicted moderately correlated topological insulator, measured by angle-resolved photoemission spectroscopy. We directly obs…
Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
J. Jiang, S. Li, T. Zhang +13
Kondo insulators (KIs) are strongly correlated materials in which the interactions between 4f and conduction electrons lead to a hybridization gap opening at low temperature 1-2. S…
Quantum oscillations in Kondo Insulator SmB
G. Li, Z. Xiang, F. Yu +15
In Kondo insulator samarium hexaboride SmB, strong correlation and band hybridization lead to an insulating gap and a diverging resistance at low temperature. The resistance di…
Physical properties of FeS (=K, Rb and Cs) single crystals
J. J. Ying, Z. J. Xiang, Z. Y. Li +5
We successfully synthesized two new compounds RbFeS and CsFeS which were isostructural with KFeSe superconductor. We systematically…