Proposal for an ac spin current source
arXiv:1403.6674 · doi:10.1209/0295-5075/107/27003
Abstract
We propose an ac current source that can be tuned from a pure charge to a pure spin current source. The device consists of two mesoscopic capacitors attached to a two-dimensional strip of a topological insulator. The change from charge to spin current is controlled by an offset in the top gate potentials that drive the capacitors. In addition to this setup, which anticipates the experimental realisation of quantum point contacts in topological insulators, we propose an analogous source in the quantum Hall regime which only relies on presently available building blocks. To this end, we calculate the band structure of a topological insulator in a magnetic field. The intrinsic spin-orbit coupling, together with a split gate, allows for an analogous source, where charge and spin current can be manipulated. The realisation of the device as well as the detection of the ac spin current are within reach of present experimental technology.
6 Pages, 4 Figures, published version
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Cited by in corpus (9)
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- Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
- Shaping charge excitations in chiral edge states with a time-dependent gate voltage
- Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurements
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- All-electric spin transistor based on a side-gate-modulated two-dimensional topological insulator
- Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
- Characterization of helical Luttinger liquids in microwave stepped-impedance edge resonators
- Emission of entangled Kramers pairs from a helical mesoscopic capacitor