Edge accumulation and currents of moment in 2D topological insulators

Abstract

The Letter is analyzing bulk spin (moment) currents and spin (moment) accumulation at edges of a 2D topological insulator taking into account reflection from edges. Accumulation occurs only at edge states, which distinguish topological insulators from conventional ones. The band continuum can support the transverse bulk spin (moment) current, but it does not governed by the topological Chern number and may exist in a conventional insulator. There is no edge accumulation related with bulk currents.

4 pages, 2 figures, the introductory and the concluding parts of the paper revised, new references added

References in corpus (8)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Direct electronic measurement of the spin Hall effect
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• The Quantum Spin Hall Effect: Theory and Experiment
• Finite size effects of helical edge states in HgTe/CdTe quantum wells
• Mechanical measurement of equilibrium spin currents in the Rashba medium

Cited by in corpus (14)

• Interaction effects and quantum phase transitions in topological insulators
• Helical Quantum States in HgTe Quantum Dots with Inverted Band Structures
• Chern-Simons-Matter Theory
• Magnetic field effects on edge and bulk states in topological insulators based on HgTe/CdHgTe quantum wells with strong natural interface inversion asymmetry
• Hyperfine interactions in two-dimensional HgTe topological insulators
• Analytic Theory of Edge Modes in Topological Insulators
• High-frequency nonlinear transport and photogalvanic effects in two-dimensional topological insulators
• Effective Hamiltonian for protected edge states in graphene
• Dirac electrons in quantum rings
• Electrically controlled crossing of energy levels in quantum dots in two-dimensional topological insulators
• A k.p treatment of edge states in narrow 2D topological insulators, with standard boundary conditions for the wave function and its derivative
• Effects of electron-hole asymmetry on electronic structure of helical edge states in HgTe/HgCdTe quantum wells
• Hard wall edge confinement in 2D topological insulators and the energy of the Dirac Point
• Effect of extended confinement on the structure of edge channels in the quantum anomalous Hall effect