Transport signatures of surface potentials on three-dimensional topological insulators
arXiv:1509.05432 · doi:10.1103/PhysRevB.93.085422
Abstract
The spin-momentum locked nature of the robust surface states of three dimensional topological insulators (3D TI) make them promising candidates for spintronics applications. Surface potentials which respect time reversal symmetry can exist at the surface between a 3D TI and the trivial vacuum. These potentials can distort the spin texture of the surface states while retaining their gapless nature. In this work, the effect of all such surface potentials on the spin textures is studied. Since, a tunnel magnetoresistance signal carries the information of the spin texture, it is proposed that spin-polarized tunneling of electrons to a 3D TI surface can be used to uniquely identify the surface potentials and quantitatively characterize them.
9 pages, 4 figures, version published in Physical Review B
References in corpus (11)
- 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
- A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
- Topological Field Theory of Time-Reversal Invariant Insulators
- Topological Surface States Protected From Backscattering by Chiral Spin Texture
- Three dimensional topological invariants for time reversal invariant Hamiltonians and the three dimensional quantum spin Hall effect
- Room Temperature Electrical Detection of Spin Polarized Currents in Topological Insulators
- Spin-Polarized Tunneling Study on Spin-Momentum Locking in the Topological Insulators
- Tunnel Magnetoresistance scan of a pristine three-dimensional topological insulator
- Probing surface states exposed by crystal terminations at arbitrary orientations of three-dimensional topological insulators