Generating and controlling spin-polarized currents induced by a quantum spin Hall antidot

Abstract

We study an electrically controlled quantum spin Hall antidot embedded in a two-dimensional topological insulating bar. Helical edge states around the antidot and along the edges of the bar are tunnel coupled. The close connection between spin and chirality, typical of helical systems, allows to generate a spin-polarized current flowing across the bar. This current is studied as a function of the external voltages, by varying the asymmetry between the barriers. For asymmetric setups, a switching behavior of the spin current is observed as the bias is increased, both in the absence and in the presence of electron interactions. This device allows to generate and control the spin-polarized current by simple electrical means.

7 pages, 6 figures

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Cited by in corpus (33)

• Chiral thermoelectrics with quantum Hall edge states
• Heat diode and engine based on quantum Hall edge states
• Nonlinear phenomena in quantum thermoelectrics and heat
• Proposal for an on-demand source of polarized electrons into the edges of a topological insulator
• Hong-Ou-Mandel characterization of multiply charged Levitons
• Electronic Hong-Ou-Mandel interferometry in two-dimensional topological insulators
• Coulomb blockade microscopy of spin density oscillations and fractional charge in quantum spin Hall dots
• Single quasiparticle and electron nano-emitter in the fractional quantum Hall regime
• Nonlinear spin-thermoelectric transport in two-dimensional topological insulators
• Tunnel junction of helical edge states: Determining and controlling spin-preserving and spin-flipping processes through transconductance
• Spin current pumping in helical Luttinger liquids
• Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices
• Optimal thermoelectricity with quantum spin-Hall edge states
• Polarized heat current generated by quantum pumping in two-dimensional topological insulators
• Temperature-induced emergence of Wigner correlations in a STM-probed one-dimensional quantum dot
• Spin textures of strongly correlated spin Hall quantum dots
• Helical spin thermoelectrics controlled by a side-coupled magnetic quantum dot in the quantum spin Hall state
• Theory of the STM detection of Wigner molecules in spin incoherent CNTs
• Noise and current correlations in tunnel junctions of Quantum Spin Hall edge states
• Magnetic AC control of the spin textures in a helical Luttinger liquid
• Measuring the Kondo Cloud by Current Cross Correlations in Helical Liquids
• Proposal for an ac spin current source
• All-electric spin transistor based on a side-gate-modulated two-dimensional topological insulator
• Effects of disorder on electron tunneling through helical edge states
• Boosting energy transfer between quantum devices through spectrum engineering in the dissipative ultrastrong coupling regime
• Reconstruction-Induced ${\phi }_0$ Josephson Effect in Quantum Spin Hall Constrictions
• Transport through a quantum spin Hall antidot as a spectroscopic probe of spin textures
• Emission of entangled Kramers pairs from a helical mesoscopic capacitor
• Nonequilibrium transport of helical Luttinger liquids through a quantum dot
• Spin-polarized tunneling into helical edge states: asymmetry and conductances
• Probing Wigner correlations in a suspended carbon nanotube
• Transport in quantum spin Hall edges in contact to a quantum dot
• Network architecture of energy landscapes in mesoscopic quantum systems