Journal
PHYSICAL REVIEW B
Volume 93, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.214206
Keywords
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Funding
- NSFC of China [11374249]
- Hong Kong RGC Grants [163011151, 605413]
- Israel Science Foundation [400/2012]
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Occurrence of the topological Anderson insulator (TAI) in a HgTe quantum well suggests that when time-reversal symmetry (TRS) is maintained, the pertinent topological phase transition, marked by re-entrant 2e(2)/h quantized conductance contributed by helical edge states, is driven by disorder. Here we show that when TRS is broken, the physics of the TAI becomes even richer. The pattern of longitudinal conductance and nonequilibrium local current distribution displays novel TAI phases characterized by nonzero Chern numbers, indicating the occurrence of multiple chiral edge modes. Tuning either disorder or Fermi energy (in both topologically trivial and nontrivial phases), drives transitions between these distinct TAI phases, characterized by jumps of the quantized conductance from 0 to e(2)/h and from e(2)/h to 2e(2)/h. An effective medium theory based on the Born approximation yields an accurate description of different TAI phases in parameter space.
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