Robust Level Coincidences in the Subband Structure of Quasi 2D Systems

Details Robust Level Coincidences in the Subband Structure of Quasi 2D Systems Robust Level Coincidences in the Subband Structure of Quasi 2D Systems

2010-11-19

arxiv.org/abs/1011.4504v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

conclusions extended

Scientific paper

Recently, level crossings in the energy bands of crystals have been identified as a key signature for topological phase transitions. Using realistic models we show that the parameter space controlling the occurrence of level coincidences in energy bands has a much richer structure than anticipated previously. In particular, we identify robust level coincidences that cannot be removed by a small perturbation of the Hamiltonian compatible with the crystal symmetry. Different topological phases that are insulating in the bulk are then separated by a gapless (metallic) phase. We consider HgTe/CdTe quantum wells as a specific example.

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