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  • Letter
  • Open Access

Eliminating the confined dark-exciton qubit precession using an externally applied magnetic field

Zu-En Su1,2, Dan Cogan1, Ido Schwartz1, Ayal Beck1, and David Gershoni1,3,2

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Phys. Rev. B 111, L161302 – Published 21 April, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L161302

Abstract

We investigate experimentally and theoretically the behavior of the confined dark exciton in an InAs/GaAs semiconductor quantum dot, under the application of an external magnetic field in a Voigt configuration. We show that by varying the magnitude and direction of the external field one can accurately control the dark-exciton fine-structure splitting. In addition, we show that the dark-exciton spin state is approximately polarized along the cubic crystallographic directions [100] or equivalents. By comparing our experimental results with a model for the exchange and Zeeman interactions, we find the conditions for nullifying the fine-structure splitting between the two eigenstates of the dark exciton, thereby stopping its qubit precession.

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Phys. Rev. B 111, L161302– Published 21 April, 2025
  • Received 9 January 2025
  • Accepted 1 April 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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