Probing electron-phonon interactions in the charge-photon dynamics of cavity-coupled double quantum dots

M. J. Gullans, J. M. Taylor, and J. R. Petta
Phys. Rev. B 97, 035305 – Published 16 January 2018; Erratum Phys. Rev. B 98, 159902 (2018)

Abstract

Electron-phonon coupling is known to play an important role in the charge dynamics of semiconductor quantum dots. Here we explore its role in the combined charge-photon dynamics of cavity-coupled double quantum dots. Previous work on these systems has shown that strong electron-phonon coupling leads to a large contribution to photoemission and gain from phonon-assisted emission and absorption processes. We compare the effects of this phonon sideband in three commonly investigated gate-defined quantum dot material systems: InAs nanowires and GaAs and Si two-dimensional electron gases (2DEGs). We compare our theory with existing experimental data from cavity-coupled InAs nanowire and GaAs 2DEG double quantum dots and find quantitative agreement only when the phonon sideband and photoemission processes during lead tunneling are taken into account. Finally, we show that the phonon sideband also leads to a sizable renormalization of the cavity frequency, which allows for direct spectroscopic probes of the electron-phonon coupling in these systems.

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  • Received 3 November 2017
  • Revised 26 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.035305

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Erratum

Authors & Affiliations

M. J. Gullans1,2, J. M. Taylor2, and J. R. Petta1

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
  • 2Joint Quantum Institute and Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland 20742, USA

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Issue

Vol. 97, Iss. 3 — 15 January 2018

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