Three-dimensional phase diagram of disordered HgTe/CdTe Quantum spin-Hall wells

Details Three-dimensional phase diagram of disordered HgTe/CdTe Quantum spin-Hall wells Three-dimensional phase diagram of disordered HgTe/CdTe Quantum spin-Hall wells

2011-02-22

arxiv.org/abs/1102.4535v2

Phys. Rev. B 83, 195119 (2011)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Final form

Scientific paper

10.1103/PhysRevB.83.195119

We compute the phase diagram of the HgTe/CdTe quantum wells in the 3 dimensional (3D) parameter space of Dirac mass, Fermi level and disorder strength. The phase diagram reveals the Quantum spin-Hall, the metallic and the normal insulating phases. The phase boundary of the Quantum spin-Hall state is shown to be strongly deformed by the disorder. Taking specific cuts into this 3D phase diagram, we recover the so called topological Anderson insulator (TAI) phase, but now we can demonstrate explicitly that TAI is not a distinct phase and instead it is part of the Quantum spin-Hall phase. The calculations are performed with $S_z$-conserving and $S_z$-nonconserving Hamiltonians.

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