Strong cavity-pseudospin coupling in monolayer transition metal dichalcogenides

Amrit De and Roger K. Lake
Phys. Rev. B 96, 035436 – Published 25 July 2017

Abstract

Strong coupling between the electronic states of monolayer transition metal dichalcogenides (TMDCs) such as MoS2,MoSe2,WS2, or WSe2, and a single in-plane optical cavity mode gives rise to valley- and spin-dependent cavity-QED effects. The Dirac Hamiltonian for this two-dimensional gapped semiconductor with large spin-orbit coupling facilitates pure Jaynes-Cummings-type coupling with spin-valley locking—providing an additional handle for spintronics using circularly polarized light. Besides being an on-chip light source, the strong cavity coupling causes the TMDC monolayer to act as a spontaneous spin oscillator. In addition, this system can be a sensitive magnetic field sensor for an in-plane magnetic field. It also displays unusual persistent Rabi oscillations between different conduction-band states that are insensitive to small magnetic field variations. Our analysis for dissipation due to finite exciton relaxation times and cavity losses suggests that these effects are observable.

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  • Received 5 January 2016
  • Revised 26 April 2017

DOI:https://doi.org/10.1103/PhysRevB.96.035436

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Amrit De* and Roger K. Lake

  • Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, USA

  • *amritde@gmail.com
  • rlake@ece.ucr.edu

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Issue

Vol. 96, Iss. 3 — 15 July 2017

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