Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 5, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.053703
Keywords
Z(2) topological insulator; HgTe; disorder; phase diagram; density of states; transfer matrix; self-consistent Born approximation
Categories
Funding
- JSPS [08J56061]
- [20740167]
- [19740189]
- Grants-in-Aid for Scientific Research [20102008, 20340084, 08J56061] Funding Source: KAKEN
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Effects of disorder on two-dimensional Z(2) topological insulator are studied numerically by the transfer matrix method. Based on the scaling analysis, the phase diagram is derived for a model of HgTe quantum well as a function of disorder strength and magnitude of the energy gap. In the presence of s(z) non-conserving spin-orbit coupling, a finite metallic region is found that partitions the two topologically distinct insulating phases. As disorder increases, a narrow-gap topologically trivial insulator undergoes a series of transitions; first to metal, second to topological insulator, third to metal, and finally back to trivial insulator. We show that this multiple transition is a consequence of two disorder effects; renormalization of the band gap, and Anderson localization. The metallic region found in the scaling analysis corresponds roughly to the region of finite density of states at the Fermi level evaluated in the self-consistent Born approximation.
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