Coherent spin transport through helical edge states of topological insulator
arXiv:1904.12949 · doi:10.1038/s41524-020-00442-z
Abstract
We study coherent spin transport through helical edge states of topological insulator tunnel-coupled to metallic leads. We demonstrate that unpolarized incoming electron beam acquires finite polarization after transmission through such a setup provided that edges contain at least one magnetic impurity. The finite polarization appears even in the fully classical regime and is therefore robust to dephasing. There is also a quantum magnetic field-tunable contribution to the polarization, which shows sharp identical Aharonov-Bohm resonances as a function of magnetic flux - with the period - and survives at relatively high temperature. We demonstrate that this tunneling interferometer can be described in terms of ensemble of flux-tunable qubits giving equal contributions to conductance and spin polarization. The number of active qubits participating in the charge and spin transport is given by the ratio of the temperature and the level spacing. The interferometer can effectively operate at high temperature and can be used for quantum calculations. In particular, the ensemble of qubits can be described by a single Hadamard operator. The obtained results open wide avenue for applications in the area of quantum computing.
arXiv comment15 pages, 9 figures
References in corpus (52)
- Topological Insulators
- Topological insulators and superconductors
- Spintronics: Fundamentals and applications
- Quantum Spin Hall Effect in Graphene
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Basic obstacle for electrical spin-injection from a ferromagnetic metal into a diffusive semiconductor
- Silicon Quantum Electronics
- Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
- Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
- Nonlocal edge state transport in the quantum spin Hall state
- Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
- Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
- Electronic measurement and control of spin transport in Silicon
- Gated Silicene as a tunable source of nearly 100% spin-polarized electrons
- All-electric all-semiconductor spin field effect transistors
- Spin Hall effect transistor
- Spin polarization of the quantum spin Hall edge states
- Voltage-Controlled Spin Selection in a Magnetic Resonant Tunnelling Diode
- Coherent control of single electrons: a review of current progress
- Inelastic electron backscattering in a generic helical edge channel
- Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
- All-Electric Quantum Point Contact Spin Valve
- Spintronic single qubit gate based on a quantum ring with spin-orbit interaction
- Transport in disordered two-dimensional topological insulator
- Tomonaga-Luttinger liquid in the edge channels of a quantum spin Hall insulator
- Conductivity of a generic helical liquid
- Interacting topological edge channels
- A new paradigm for the quantum spin Hall effect at high temperatures
- Bound states and persistent currents in topological insulator rings
- Spin-polarized current induced by a local exchange field in a silicene nanoribbon
- Theoretical, numerical, and experimental study of a flying qubit electronic interferometer
- Spin-thermoelectric transport induced by interactions and spin-flip processes in two dimensional topological insulators
- Ballistic geometric resistance resonances in a single surface of a topological insulator
- Coherent Oscillations and Giant Edge Magnetoresistance in Singly Connected Topological Insulators
- Helical edge transport in the presence of a magnetic impurity
- Spin filtering in all-electrical three-terminal interferometers
- Aharonov-Bohm conductance through a single-channel quantum ring: Persistent-current blockade and zero-mode dephasing
- Polarized heat current generated by quantum pumping in two-dimensional topological insulators
- Aharonov-Bohm conductance of a disordered single-channel quantum ring
- Evidence on the macroscopic length scale spin coherence for the edge currents in a narrow HgTe quantum well
- High-temperature Aharonov-Bohm-Casher interferometer
- Intrinsic oscillations of spin current polarization in a paramagnetic resonant tunneling diode
- Tunneling Aharonov-Bohm interferometer on helical edge states
- Pure spin current in a two-dimensional topological insulator
- Two-electron selective coupling in an edge-state based conditional phase shifter
- Engineering Topological quantum dot through planar magnetization in bismuthene
- Spin field-effect transistor in a quantum spin-Hall device
- Resonance spin transfer torque in ferromagnetic/normal/ferromagnetic spin-valve structure of topological insulators
- Aharonov-Bohm effect in a helical ring with long-range hopping: Effects of Rashba spin-orbit interaction and disorder
- Spin-charge separation in an Aharonov-Bohm interferometer
- Quantum computing through electron propagation in the edge states of quantum spin Hall systems
Cited by in corpus (5)
- Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator
- Spin and charge transport through helical Aharonov-Bohm interferometer with strong magnetic impurity
- Tunable helical crystals
- Fate of gapless edge states in two-dimensional topological insulators with Hatsugai-Kohmoto interaction
- Topological insulator realization induced by fermionic interaction through BF mediators