標題: Robust level coincidences in the subband structure of quasi-2D systems
作者: Winkler, R.
Wang, L. Y.
Lin, Y. H.
Chu, C. S.
電子物理學系
Department of Electrophysics
關鍵字: Semiconductors;Topological insulators
公開日期: 1-十二月-2012
摘要: 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. (c) 2012 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ssc.2012.09.002
http://hdl.handle.net/11536/20866
ISSN: 0038-1098
DOI: 10.1016/j.ssc.2012.09.002
期刊: SOLID STATE COMMUNICATIONS
Volume: 152
Issue: 23
起始頁: 2096
結束頁: 2099
顯示於類別:期刊論文


文件中的檔案:

  1. 000312233600007.pdf