Controlling the dark exciton spin eigenstates by external magnetic field

L. Gantz, E. R. Schmidgall, I. Schwartz, Y. Don, E. Waks, G. Bahir, and D. Gershoni
Phys. Rev. B 94, 045426 – Published 20 July 2016

Abstract

We study the dark exciton's behavior as a coherent physical two-level spin system (qubit) using an external magnetic field in the Faraday configuration. Our studies are based on polarization-sensitive intensity autocorrelation measurements of the optical transition resulting from the recombination of a spin-blockaded biexciton state, which heralds the dark exciton and its spin state. We demonstrate control over the dark exciton eigenstates without degrading its decoherence time. Our observations agree well with computational predictions based on a master equation model.

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  • Received 7 January 2016
  • Revised 30 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.045426

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

L. Gantz1,2, E. R. Schmidgall2,3, I. Schwartz2, Y. Don2, E. Waks4, G. Bahir1,5, and D. Gershoni2,5

  • 1Faculty of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
  • 2The Physics Department and the Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
  • 3Department of Physics, University of Washington, Seattle, Washington 98195, USA
  • 4The Joint Quantum Institute and the Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
  • 5The Solid State Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel

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Issue

Vol. 94, Iss. 4 — 15 July 2016

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