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

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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• Cavity-coupled double-quantum dot at finite bias: analogy with lasers and beyond
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Cited by in corpus (7)

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• Differentiable master equation solver for quantum device characterisation
• Equivalence between the second order steady state for the spin-Boson model and its quantum mean force Gibbs state
• Two-quanta processes in coupled double-quantum-dot cavity systems
• Nonclassical radiation from a nonlinear oscillator driven solely by classical $1/f$ noise
• Phonon-assisted transport and hole-phonon coupling in GaAs double quantum dots