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Topological Insulators at Room Temperature
Haijun Zhang, Chao-Xing Liu, Xiao-Liang Qi +3
Topological insulators are new states of quantum matter with surface states protected by the time-reversal symmetry. In this work, we perform first-principle electronic structure c…
Seeing the magnetic monopole through the mirror of topological surface states
Xiao-Liang Qi, Rundong Li, Jiadong Zang +1
Existence of the magnetic monopole is compatible with the fundamental laws of nature, however, this illusive particle has yet to be detected experimentally. In this work, we show t…
Algebraic spin liquid in an exactly solvable spin model
Hong Yao, Shou-Cheng Zhang, Steven A. Kivelson
We have proposed an exactly solvable quantum spin-3/2 model on a square lattice. Its ground state is a quantum spin liquid with a half integer spin per unit cell. The fermionic exc…
Field-induced Gap and Quantized Charge Pumping in Nano-helix
Xiao-Liang Qi, Shou-Cheng Zhang
We propose several novel physical phenomena based on nano-scale helical wires. Applying a static electric field transverse to the helical wire induces a metal to insulator transiti…
Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
Wei-Cheng Lee, Shou-Cheng Zhang, Congjun Wu
We investigate the competition between the extended -wave and -wave pairing order parameters in the iron-based superconductors. Because of the frustrating pai…
Quantum spin Hall effect in a transition metal oxide Na2IrO3
Atsuo Shitade, Hosho Katsura, Jan Kunes +3
We study theoretically the electronic states in a transition metal oxide NaIrO, in which both the spin-orbit interaction and the electron correlation play crucial role…
Magnetic impurities on the surface of a topological insulator
Qin Liu, Chao-Xing Liu, Cenke Xu +2
The surface states of a topological insulator are described by an emergent relativistic massless Dirac equation in 2+1 dimensions. In contrast to graphene, there is an odd number o…
Pairing strengths for a two orbital model of the Fe-pnictides
Xiao-Liang Qi, S. Raghu, Chao-Xing Liu +2
Using an RPA approximation, we have calculated the strengths of the singlet and triplet pairing interactions which arise from the exchange of spin and orbital fluctuations for a 2-…
A minimal two-band model for the superconducting Fe-pnictides
S. Raghu, Xiao-Liang Qi, Chao-Xing Liu +2
Following the discovery of the Fe-pnictide superconductors, LDA band structure calculations showed that the dominant contributions to the spectral weight near the Fermi energy came…
Topological Superconductivity and Superfluidity
Xiao-Liang Qi, Taylor L. Hughes, Srinivas Raghu +1
We construct time reversal invariant topological superconductors and superfluids in two and three dimensions which are analogous to the recently discovered quantum spin Hall and th…
Topological Field Theory of Time-Reversal Invariant Insulators
Xiao-Liang Qi, Taylor Hughes, Shou-Cheng Zhang
We show that the fundamental time reversal invariant (TRI) insulator exists in 4+1 dimensions, where the effective field theory is described by the 4+1 dimensional Chern-Simons the…
Quantum Anomalous Hall Effect in HgMnTe Quantum Wells
Chao-Xing Liu, Xiao-Liang Qi, Xi Dai +2
The quantum Hall effect is usually observed when the two-dimensional electron gas is subjected to an external magnetic field, so that their quantum states form Landau levels. In th…
Spin Charge Separation in the Quantum Spin Hall State
Xiao-Liang Qi, Shou-Cheng Zhang
The quantum spin Hall state is a topologically non-trivial insulator state protected by the time reversal symmetry. We show that such a state always leads to spin-charge separation…
The Quantum Spin Hall Effect: Theory and Experiment
Markus Koenig, Hartmut Buhmann, Laurens W. Molenkamp +4
The search for topologically non-trivial states of matter has become an important goal for condensed matter physics. Recently, a new class of topological insulators has been propos…