Journal
PHYSICAL REVIEW B
Volume 81, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.041307
Keywords
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Funding
- NSF of China
- National Basic Research Program of China [2007CB925000]
- International Science and Technology Cooperation Program of China
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- Alexander von Humboldt Foundation of Germany
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We investigate the crossover regime from three-dimensional topological insulators Bi2Te3 and Bi2Se3 to two-dimensional topological insulators with quantum spin Hall effect when the layer thickness is reduced. Using both analytical models and first-principles calculations, we find that the crossover occurs in an oscillatory fashion as a function of the layer thickness, alternating between topologically trivial and nontrivial two-dimensional behavior.
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