Photon-induced tunability of the thermospin current in a Rashba ring

Nzar Rauf Abdullah, Thorsten Arnold, Chi Shung Tang, Andrei Manolescu, Vidar Gudmundsson

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The goal of this work is to show how the thermospin polarization current in a quantum ring changes in the presence of Rashba spin-orbit coupling and a quantized single photon mode of a cavity the ring is placed in. Employing the reduced density operator and a general master equation formalism, we find that both the Rashba interaction and the photon field can significantly modulate the spin polarization and the thermospin polarization current. Tuning the Rashba coupling constant, degenerate energy levels are formed corresponding to the Aharonov-Casher destructive phase interference in the quantum ring system. Our analysis indicates that the maximum spin polarization can be observed at the points of degenerate energy levels due to spin accumulation in the system without the photon field. The thermospin current is thus suppressed. In the presence of the cavity, the photon field leads to an additional kinetic momentum of the electron. As a result the spin polarization can be enhanced by the photon field.

Original languageEnglish
Article number145303
JournalJournal of Physics Condensed Matter
Volume30
Issue number14
DOIs
Publication statusPublished - 15 Mar 2018

Bibliographical note

Funding Information:
This work was financially supported by the Research Fund of the University of Iceland, the Icelandic Research Fund, grant no. 163082-051, and the Icelandic Infrastructure Fund. We acknowledge Sulaimani University—Komar University of Science and Technology—Iraq, and the Ministry of Science and Technology, Taiwan through Contract No. MOST 106-2112-M-239-001-MY3

Publisher Copyright:
© 2018 IOP Publishing Ltd.

Other keywords

  • cavity quantum electrodynamics
  • electro-optical effects
  • electronic transport in mesoscopic systems
  • Spin polarized transport through
  • thermo-optic effects

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