Helical edge states in multiple topological mass domains
arXiv:1209.2313 · doi:10.1088/0268-1242/27/12/124007
Abstract
The two-dimensional topological insulating phase has been experimentally discovered in HgTe quantum wells (QWs). The low-energy physics of two-dimensional topological insulators (TIs) is described by the Bernevig-Hughes-Zhang (BHZ) model, where the realization of a topological or a normal insulating phase depends on the Dirac mass being negative or positive, respectively. We solve the BHZ model for a mass domain configuration, analyzing the effects on the edge modes of a finite Dirac mass in the normal insulating region (soft-wall boundary condition). We show that at a boundary between a TI and a normal insulator (NI), the Dirac point of the edge states appearing at the interface strongly depends on the ratio between the Dirac masses in the two regions. We also consider the case of multiple boundaries such as NI/TI/NI, TI/NI/TI and NI/TI/NI/TI.
11 pages, 15 figures
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Cited by in corpus (14)
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- Hyperfine interactions in two-dimensional HgTe topological insulators
- Light-induced phase crossovers in a quantum spin Hall system
- Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator
- Confinement and Fermion Doubling Problem in Dirac-like Hamiltonians
- Chiral Majorana edge states in HgTe quantum wells
- Modeling Near-Surface Bound Electron States in Three-Dimensional Topological Insulator: Analytical and Numerical Approaches
- Blurring the boundaries between topological and non-topological phenomena in dots
- Phase diagram of two interacting helical states
- Zitterbewegung and bulk-edge Landau-Zener tunneling in topological insulators
- An all electron topological insulator in InAs double wells
- Dual topological insulator with mirror symmetry protected helical edge states
- Transport signatures of a quantum spin Hall - chiral topological superconductor junction
- Hard wall edge confinement in 2D topological insulators and the energy of the Dirac Point