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Weyl Semimetals with symmetry
Yuting Qian, Jiacheng Gao, Zhida Song +4
In the time-reversal-breaking centrosymmetric systems, the appearance of Weyl points can be guaranteed by an odd number of all the even/odd parity occupied bands at eight inversion…
Chiral fermion reversal in chiral crystals
Hang Li, Sheng Xu, Zhi-Cheng Rao +13
In materials chiral fermions such as Weyl fermions are characterized by nonzero chiral charges, which are singular points of Berry curvature in momentum space. Recently, new types…
BaHgSn: A Dirac semimetal with surface hourglass fermions
Tan Zhang, Zhihai Cui, Zhijun Wang +2
We proposed that BaHgSn is a Dirac semimetal (DSM) which can host hourglass-like surface states (HSSs) as protected by nonsymmorphic glide symmetry. Compared to KHgSb, an isostruct…
Layer Construction of Topological Crystalline Insulator LaSbTe
Yuting Qian, Zhiyun Tan, Tan Zhang +5
Topological crystalline insulator (TCI) is one of the symmetry-protected topological states. Any TCI can be deformed into a simple product state of several decoupled two-dimensiona…
Symmetry-Enforced Weyl Phonons
Qing-Bo Liu, Yuting Qian, Hua-Hua Fu +1
In spinful electronic systems, time-reversal symmetry makes that all Kramers pairs at the time-reversal-invariant momenta are Weyl points (WPs) in chiral crystals. Here, we find th…
Magnetic topological insulator MnBi6Te10 with zero-field ferromagnetic state and gapped Dirac surface states
Shangjie Tian, Shunye Gao, Simin Nie +14
Magnetic topological insulators (TIs) with nontrivial topological electronic structure and broken time-reversal symmetry exhibit various exotic topological quantum phenomena. The r…
Electronic structures and topological properties in nickelates NiO
Jiacheng Gao, Zhijun Wang, Chen Fang +1
After the significant discovery of the hole-doped nickelate compound NdSrNiO, an analysis of the electronic structure, orbital components, Fermi surfaces and ba…
A Charge-Density-Wave Topological Semimetal
Wujun Shi, Benjamin J. Wieder, H. L. Meyerheim +14
Topological physics and strong electron-electron correlations in quantum materials are typically studied independently. However, there have been rapid recent developments in quantu…
Strong and Fragile Topological Dirac Semimetals with Higher-Order Fermi Arcs
Benjamin J. Wieder, Zhijun Wang, Jennifer Cano +4
Dirac and Weyl semimetals both exhibit arc-like surface states. However, whereas the surface Fermi arcs in Weyl semimetals are topological consequences of the Weyl points themselve…
Magnetic semimetals and quantized anomalous Hall effect in EuB6
Simin Nie, Yan Sun, Fritz B. Prinz +4
Exploration of the novel relationship between magnetic order and topological semimetals has received enormous interest in a wide range of both fundamental and applied research. Her…
Topological Electronic States in HfRuP Family Superconductors
Yuting Qian, Simin Nie, Changjiang Yi +8
Based on the first-principles calculations and experimental measurements, we report that the hexagonal phase of ternary transition metal pnictides TT'X (T=Zr, Hf; T'=Ru; X=P, As),…
Topological Crystalline Insulators with Rotation Anomaly
Tan Zhang, Changming Yue, Tiantian Zhang +5
Based on first-principles calculations and symmetry-based indicator analysis, we find a class of topological crystalline insulators (TCIs) with rotation anomaly in a family o…
Higher-order Topology of Axion Insulator EuInAs
Yuanfeng Xu, Zhida Song, Zhijun Wang +2
Based on first-principles calculations and symmetry analysis, we propose that EuInAs is a long awaited axion insulator with antiferromagnetic (AFM) long range order. Charac…
Glide-resolved photoemission spectroscopy: Measuring topological invariants in nonsymmorphic space groups
A. Alexandradinata, Zhijun Wang, B. Andrei Bernevig +1
The two classes of 3D, time-reversal-invariant insulators are known to subdivide into four classes in the presence of glide symmetry. Here, we extend this classification of insulat…