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Title: Helical edge and surface states in HgTe quantum wells and bulk insulators

Abstract

The quantum spin Hall (QSH) effect is the property of a new state of matter which preserves time reversal, has an energy gap in the bulk, but has topologically robust gapless states at the edge. Recently, the QSH state has been theoretically predicted and experimentally observed in HgTe quantum wells [B. A. Bernevig et al., Science 34, 1757 (2006); M. Konig et al., ibid. 318, 766 (2007)]. In this work, we start from realistic tight-binding models and demonstrate the existence of the helical edge states in HgTe quantum wells and calculate their physical properties. We also show that three-dimensional HgTe is a topological insulator under uniaxial strain and show that the surface states are described by single-component massless relativistic Dirac fermions in 2+1 dimensions. Experimental predictions are made based on the quantitative results obtained from realistic calculations.

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
973048
Report Number(s):
SLAC-REPRINT-2010-060
Journal ID: ISSN 1098-0121; TRN: US1001690
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 77; Journal Issue: 12; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DIMENSIONS; ENERGY GAP; FERMIONS; PHYSICAL PROPERTIES; QUANTUM WELLS; SPIN; STRAINS; MATSCI

Citation Formats

Dai, X. Helical edge and surface states in HgTe quantum wells and bulk insulators. United States: N. p., 2010. Web.
Dai, X. Helical edge and surface states in HgTe quantum wells and bulk insulators. United States.
Dai, X. Tue . "Helical edge and surface states in HgTe quantum wells and bulk insulators". United States.
@article{osti_973048,
title = {Helical edge and surface states in HgTe quantum wells and bulk insulators},
author = {Dai, X},
abstractNote = {The quantum spin Hall (QSH) effect is the property of a new state of matter which preserves time reversal, has an energy gap in the bulk, but has topologically robust gapless states at the edge. Recently, the QSH state has been theoretically predicted and experimentally observed in HgTe quantum wells [B. A. Bernevig et al., Science 34, 1757 (2006); M. Konig et al., ibid. 318, 766 (2007)]. In this work, we start from realistic tight-binding models and demonstrate the existence of the helical edge states in HgTe quantum wells and calculate their physical properties. We also show that three-dimensional HgTe is a topological insulator under uniaxial strain and show that the surface states are described by single-component massless relativistic Dirac fermions in 2+1 dimensions. Experimental predictions are made based on the quantitative results obtained from realistic calculations.},
doi = {},
url = {https://www.osti.gov/biblio/973048}, journal = {Physical Review B},
issn = {1098-0121},
number = 12,
volume = 77,
place = {United States},
year = {2010},
month = {3}
}