Coherent Single Spin Source based on topological insulator

Abstract

We report on the injection of quantized pure spin current into quantum conductors. In particular, we propose an on demand single spin source generated by periodically varying the gate voltages of two quantum dots that are connected to a two dimensional topological insulator via tunneling barriers. Due to the nature of the helical states of the topological insulator, one or several {\it spin pair}s can be pumped out per cycle giving rise to a pure quantized alternating spin current. Depending on the phase difference between two gate voltages, this device can serve as an on demand single spin emitter or single charge emitter. Again due to the helicity of the topological insulator, the single spin emitter or charge emitter is dissipationless and immune to disorders. The proposed single spin emitter can be an important building block of future spintronic devices.

5 pages, 4 figures, append one co-author that has been missed

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Cited by in corpus (6)

• Electron quantum optics as quantum signal processing
• Shaping charge excitations in chiral edge states with a time-dependent gate voltage
• Gauge freedom in observables and Landsbergs nonadiabatic geometric phase: pumping spectroscopy of interacting open quantum systems
• Single-electron coherence: finite temperature versus pure dephasing
• Spin-resolved electron waiting times in a quantum dot spin valve
• Emission of entangled Kramers pairs from a helical mesoscopic capacitor