Effects of electron-hole asymmetry on electronic structure of helical edge states in HgTe/HgCdTe quantum wells
arXiv:1912.09177 · doi:10.1134/S1063783420030087
Abstract
We study the effects of electron-hole asymmetry on the electronic structure of helical edge states in HgTe/HgCdTe quantum wells. In the framework of the four-band kp-model, which takes into account the absence of a spatial inversion centre, we obtain analytical expressions for the energy spectrum and wave functions of edge states, as well as the effective g-factor tensor and matrix elements of electro-dipole optical transitions between the spin branches of the edge electrons. We show that when two conditions are simultaneously satisfied -- electron-hole asymmetry and the absence of an inversion centre -- the spectrum of edge electrons deviates from the linear one, in that case we obtain corrections to the linear spectrum.
References in corpus (29)
- Topological insulators and superconductors
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
- Nonlocal edge state transport in the quantum spin Hall state
- The Quantum Spin Hall Effect: Theory and Experiment
- Edge conduction in monolayer WTe2
- Finite size effects of helical edge states in HgTe/CdTe quantum wells
- Helical edge and surface states in HgTe quantum wells and bulk insulators
- Conductance of a helical edge liquid coupled to a magnetic impurity
- Unexpected edge conduction in HgTe quantum wells under broken time reversal symmetry
- Transport in disordered two-dimensional topological insulator
- Resistance of helical edges formed in a semiconductor heterostructure
- Localization at the Edge of 2D Topological Insulator by Kondo Impurities with Random Anisotropies
- Split Dirac cones in HgTe/CdTe quantum wells due to symmetry-enforced level anticrossing at interfaces
- Photogalvanic probing of helical edge channels in 2D HgTe topological insulators
- Magnetic field effects on edge and bulk states in topological insulators based on HgTe/CdHgTe quantum wells with strong natural interface inversion asymmetry
- Helical edge states coupled to a spin bath: Current-induced magnetization
- Spin-orbit splitting of valence and conduction bands in HgTe quantum wells near the Dirac point
- Boundary Conditions and Surface States Spectra in Topological Insulators
- Photogalvanic effect in HgTe/CdTe topological insulator due to edge-bulk optical transitions
- Topological protection brought to light by the time-reversal symmetry breaking
- High-frequency nonlinear transport and photogalvanic effects in two-dimensional topological insulators
- Helical edge transport in the presence of a magnetic impurity
- Robust Level Coincidences in the Subband Structure of Quasi 2D Systems
- Edge accumulation and currents of moment in 2D topological insulators
- Optical properties of helical edge channels in zinc-blende-type topological insulators: Selection rules, circular and linear dichroism, circular and linear photocurrents
- Linearity of the edge states energy spectrum in the 2D topological insulator
- AC Response of the Edge States in a Two-Dimensional Topological Insulator Coupled to a Conducting Puddle