Direct Measurement of the Hole-Nuclear Spin Interaction in Single InP/GaInP Quantum Dots Using Photoluminescence Spectroscopy

E. A. Chekhovich, A. B. Krysa, M. S. Skolnick, and A. I. Tartakovskii
Phys. Rev. Lett. 106, 027402 – Published 10 January 2011

Abstract

We measure the hyperfine interaction of the valence band hole with nuclear spins in single InP/GaInP semiconductor quantum dots. Detection of photoluminescence (PL) of both “bright” and “dark” excitons enables direct measurement of the Overhauser shift of states with the same electron but opposite hole spin projections. We find that the hole hyperfine constant is 11% of that of the electron and has the opposite sign. By measuring the degree of circular polarization of the PL, an upper limit to the contribution of the heavy-light hole mixing to the measured value of the hole hyperfine constant is deduced. Our results imply that environment-independent hole spins are not realizable in III-V semiconductor, a result important for solid-state quantum information processing using hole spin qubits.

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  • Received 7 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.027402

© 2011 The American Physical Society

Authors & Affiliations

E. A. Chekhovich1, A. B. Krysa2, M. S. Skolnick1, and A. I. Tartakovskii1

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
  • 2Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom

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Issue

Vol. 106, Iss. 2 — 14 January 2011

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