Spin-helical detection in a semiconductor quantum device with ferromagnetic contacts

Abstract

Spin-helical states, which arise in quasi-one-dimensional (1D) channels with spin-orbital (SO) coupling, underpin efforts to realize topologically-protected quantum bits based on Majorana modes in semiconductor nanowires. Detecting helical states is challenging due to non-idealities present in real devices. Here we show by means of tight-binding calculations that by using ferromagnetic contacts it is possible to detect helical modes with high sensitivity even in the presence of realistic device effects, such as quantum interference. This is possible because of the spin-selective transmission properties of helical modes. In addition, we show that spin-polarized contacts provide a unique path to investigate the spin texture and spin-momentum locking properties of helical states. Our results are of interest not only for the ongoing development of Majorana qubits, but also as for realizing possible spin-based quantum devices, such as quantum spin modulators and interconnects based on spin-helical channels.

7 pages, 5 figures

References in corpus (12)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• Tunneling Spin Injection into Single Layer Graphene
• Tunneling Spin Injection into Single Layer Graphene (Supplementary Information)
• All-electric all-semiconductor spin field effect transistors
• Multi-mode Fabry-Pérot conductance oscillations in suspended stacking-faults-free InAs nanowires
• Conductance behavior in nanowires with spin-orbit interaction -- A numerical study
• Integrating micromagnets and hybrid nanowires for topological quantum computing
• Spin filtering in germanium/silicon core/shell nanowires with pseudo-helical gap

Cited by in corpus (2)

• Diffusive and Ballistic Transport in Ultra-thin InSb Nanowire Devices Using a Few-layer-Graphene-AlOx Gate
• Zero-bias conductance peaks at zero applied magnetic field due to stray fields from integrated micromagnets in hybrid nanowire quantum dots