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Proposal for an ac spin current source

Author:
  • Patrick P. Hofer
  • Hugo Aramberri
  • Christoph Schenke
  • Pierre A.L. Delplace
Publishing year: 2014-07-01
Language: English
Publication/Series: EPL
Volume: 107
Issue: 2
Document type: Journal article
Publisher: EDP Sciences

Abstract english

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 the present experimental technology.

Other

Published
  • ISSN: 0295-5075
Portrait of Patrick Potts
E-mail: patrick [dot] potts [at] teorfys [dot] lu [dot] se

Postdoctoral fellow

Mathematical Physics

14

Postdoctoral fellow

NanoLund

14