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Electron interaction-driven insulating ground state in Bi2Se3 topological insulators in the two dimensional limit
Minhao Liu, Cui-Zu Chang, Zuocheng Zhang +10
We report a transport study of ultrathin Bi2Se3 topological insulators with thickness from one quintuple layer to six quintuple layers grown by molecular beam epitaxy. At low tempe…
Topological superconductivity and Majorana fermions in half-metal / superconductor heterostructure
Suk Bum Chung, Hai-Jun Zhang, Xiao-Liang Qi +1
As a half-metal is spin-polarized at its Fermi level by definition, it was conventionally thought to have little proximity effect to an s-wave superconductor. Here we show that, wi…
Topological field theory and thermal responses of interacting topological superconductors
Zhong Wang, Xiao-Liang Qi, Shou-Cheng Zhang
We investigate the three-dimensional, time-reversal invariant topological superconductors with generic interaction by their response to external fields. The first description is a…
Electrically controllable surface magnetism on the surface of topological insulator
Jia-Ji Zhu, Dao-Xin Yao, Shou-Cheng Zhang +1
We study theoretically the RKKY interaction between magnetic impurities on the surface of three-dimensional topological insulators, mediated by the helical Dirac electrons. Exact a…
Topological Insulators in Ternary Compounds with a Honeycomb Lattice
Hai-Jun Zhang, Stanislav Chadov, Lukas Müchler +5
One of the most exciting subjects in solid state physics is a single layer of graphite which exhibits a variety of unconventional novel properties. The key feature of its electroni…
Critical theory of the topological quantum phase transition in a spin-2 chain
Hong-Chen Jiang, Stephan Rachel, Zheng-Yu Weng +2
We systematically study the phase diagram of S=2 spin chain, by means of density-matrix renormalization group and exact diagonalization methods and confirm the presence of a dimer…
Topological Magnetic Insulators with Corundum Structure
Jing Wang, Rundong Li, Shou-Cheng Zhang +1
Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap are protected by time-reversal symmetry. When a proper kind of a…
Theoretical prediction of topological insulator in ternary rare earth chalcogenides
Binghai Yan, Hai-Jun Zhang, Chao-Xing Liu +3
A new class of three-dimensional topological insulator, ternary rare earth chalcogenides, is theoretically investigated with ab initio calculations. Based on both bulk band structu…
Topological insulators and superconductors
Xiao-Liang Qi, Shou-Cheng Zhang
Topological insulators are new states of quantum matter which can not be adiabatically connected to conventional insulators and semiconductors. They are characterized by a full ins…
Conductance and noise signatures of Majorana backscattering
Suk Bum Chung, Xiao-Liang Qi, Joseph Maciejko +1
We propose a conductance measurement to detect the backscattering of chiral Majorana edge states. Because normal and Andreev processes have equal probability for backscattering of…
Topological insulator Bi2Se3 thin films grown on double-layer graphene by molecular beam epitaxy
Can-Li Song, Yi-Lin Wang, Ye-Ping Jiang +14
Atomically flat thin films of topological insulator Bi2Se3 have been grown on double-layer graphene formed on 6H-SiC(0001) substrate by molecular beam epitaxy. By a combined study…
Model Hamiltonian for Topological Insulators
Chao-Xing Liu, Xiao-Liang Qi, HaiJun Zhang +3
In this paper we give the full microscopic derivation of the model Hamiltonian for the three dimensional topological insulators in the family of materials (, $…
Topological Order Parameters for Interacting Topological Insulators
Zhong Wang, Xiao-Liang Qi, Shou-Cheng Zhang
We propose a topological order parameter for interacting topological insulators, expressed in terms of the full Green's functions of the interacting system. We show that it is exac…
Fractional topological insulators in three dimensions
Joseph Maciejko, Xiao-Liang Qi, Andreas Karch +1
Topological insulators can be generally defined by a topological field theory with an axion angle theta of 0 or pi. In this work, we introduce the concept of fractional topological…
Topological quantization in units of the fine structure constant
Joseph Maciejko, Xiao-Liang Qi, H. Dennis Drew +1
Fundamental topological phenomena in condensed matter physics are associated with a quantized electromagnetic response in units of fundamental constants. Recently, it has been pred…
Chiral Topological Superconductor From the Quantum Hall State
Xiao-Liang Qi, Taylor L. Hughes, Shou-Cheng Zhang
The chiral topological superconductor in two dimensions has a full pairing gap in the bulk and a single chiral Majorana state at the edge. The vortex of the chiral superconducting…
Landau Quantization of Massless Dirac Fermions in Topological Insulator
Peng Cheng, Canli Song, Tong Zhang +17
The recent theoretical prediction and experimental realization of topological insulators (TI) has generated intense interest in this new state of quantum matter. The surface states…
Tunable Multifunctional Topological Insulators in Ternary Heusler Compounds
S. Chadov, X. -L. Qi, J Kübler +3
Recently the Quantum Spin Hall effect (QSH) was theoretically predicted and experimentally realized in a quantum wells based on binary semiconductor HgTe[1-3]. QSH state and topolo…
Theoretical Prediction of Topological Insulators in Thallium-based III-V-VI Ternary Chalcogenides
Binghai Yan, Chao-Xing Liu, Hai-Jun Zhang +4
We predict a new class of three dimensional topological insulators in thallium-based III-V-VI ternary chalcogenides, including TlBiQ and TlSbQ (Q = Te, Se and S). These…
Fingerprint of Different Spin-Orbit Terms for Spin Transport in HgTe Quantum Wells
D. G. Rothe, R. W. Reinthaler, C. -X. Liu +3
Using theory, we derive an effective four band model describing the physics of the typical two-dimensional topological insulator (HgTe/CdTe quantum well)…
Quantized Anomalous Hall Effect in Magnetic Topological Insulators
Rui Yu, Wei Zhang, H. J. Zhang +3
The Hall effect, the anomalous Hall effect and the spin Hall effect are fundamental transport processes in solids arising from the Lorentz force and the spin-orbit coupling respect…
Topological quantum phase transition in an S=2 spin chain
Jiadong Zang, Hong-Chen Jiang, Zheng-Yu Weng +1
We construct a model Hamiltonian for S = 2 spin chain, where a variable parameter is introduced. The edge spin is S = 1 for , and S = 3/2 for . Due to the topologic…