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Unexpected edge conduction in HgTe quantum wells under broken time reversal symmetry
Eric Yue Ma, M. Reyes Calvo, Jing Wang +16
The realization of quantum spin Hall (QSH) effect in HgTe quantum wells (QWs) is considered a milestone in the discovery of topological insulators. The QSH edge states are predicte…
Spin-orbital Texture in Topological Insulators
Haijun Zhang, Chao-Xing Liu, Shou-Cheng Zhang
Relativistic spin-orbit coupling plays an essential role in the field of topological insulators and quantum spintronics. It gives rise to the topological non-trivial band structure…
Topological insulators from the Perspective of first-principles calculations
Haijun Zhang, Shou-Cheng Zhang
Topological insulators are new quantum states with helical gapless edge or surface states inside the bulk band gap.These topological surface states are robust against the weak time…
Topological insulators with SU(2) Landau levels
Yi Li, Shou-Cheng Zhang, Congjun Wu
We construct continuum models of 3D and 4D topological insulators by coupling spin-1/2 fermions to an SU(2) background gauge field, which is equivalent to a spatially dependent spi…
Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
Zhong Wang, Shou-Cheng Zhang
We study dynamical instability and chiral symmetry breaking in three dimensional Weyl semimetals, which turns Weyl semimetals into "axion insulators". Charge density waves (CDW) is…
Axion topological field theory of topological superconductors
Xiao-Liang Qi, Edward Witten, Shou-Cheng Zhang
Topological superconductors are gapped superconductors with gapless and topologically robust quasiparticles propagating on the boundary. In this paper, we present a topological fie…
Strongly Correlated Topological Superconductors and Topological Phase Transitions via Green's Function
Zhong Wang, Shou-Cheng Zhang
We propose several topological order parameters expressed in terms of Green's function at zero frequency for topological superconductors, which generalizes the previous work for in…
Fluctuation-induced Topological Quantum Phase Transitions in Quantum Spin Hall and Quantum Anomalous Hall Insulators
Jan Carl Budich, Ronny Thomale, Gang Li +2
We investigate the role of quantum fluctuations in topological quantum phase transitions of quantum spin Hall insulators and quantum anomalous Hall insulators. Employing the variat…
Simplified topological invariants for interacting insulators
Zhong Wang, Shou-Cheng Zhang
We propose general topological order parameters for interacting insulators in terms of the Green's function at zero frequency. They provide an unified description of various intera…
Stationary phase approximation approach to the quasiparticle interference on the surface of a strong topological insulator
Qin Liu, Xiao-Liang Qi, Shou-Cheng Zhang
Topological insulators have surface states with unique spin-orbit coupling. With impurities on the surface, the quasiparticle interference pattern is an effective way to reveal the…
Topological p-n Junction
Jing Wang, Xi Chen, Bang-Fen Zhu +1
We consider a junction between surface -type and surface -type on an ideal topological insulator in which carrier type and density in two adjacent regions are locally control…
Interacting topological phases and modular invariance
Shinsei Ryu, Shou-Cheng Zhang
We discuss a (2+1) dimensional topological superconductor with left- and right-moving Majorana edge modes and a symmetry. In the absence of…
Topological invariants for interacting topological insulators with inversion symmetry
Zhong Wang, Xiao-Liang Qi, Shou-Cheng Zhang
For interacting Z_2 topological insulators with inversion symmetry, we propose a simple topological invariant expressed in terms of the parity eigenvalues of the interacting Green'…