Impact of the phonon environment on the nonlinear quantum-dot-cavity QED: Path-integral approach

Sirkina, L. S. and Muljarov, E. A. ORCID: https://orcid.org/0000-0002-2878-4148 2023. Impact of the phonon environment on the nonlinear quantum-dot-cavity QED: Path-integral approach. Physical Review B (condensed matter and materials physics) 108 (11) , 115312. 10.1103/PhysRevB.108.115312

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Abstract

We demonstrate a strong influence of the phonon environment on the coherent dynamics of the quantum dot (QD)-cavity system in the quantum strong coupling regime. This regime is implemented in the nonlinear QD-cavity QED and can be reliably measured by heterodyne spectral interferometry. We present a semianalytic asymptotically exact path integral-based approach to the nonlinear optical response of this system, which includes two key ingredients: Trotter's decomposition and linked-cluster expansion. Applied to the four-wave-mixing optical polarization, this approach provides access to different excitation and measurement channels, as well as to higher-order optical nonlinearities and quantum correlators. Furthermore, it allows us to extract useful analytic approximations and analyze the nonlinear optical response in terms of quantum transitions between phonon-dressed states of the anharmonic Jaynes-Cummings (JC) ladder. Being well described by these approximations at low temperatures and small exciton-cavity coupling, the exact solution deviates from them for stronger couplings and higher temperatures, demonstrating remarkable non-Markovian effects, spectral asymmetry, and strong phonon renormalization of the JC ladder.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2469-9950
Date of First Compliant Deposit:	26 January 2024
Date of Acceptance:	5 September 2023
Last Modified:	30 Jan 2024 17:15
URI:	https://orca.cardiff.ac.uk/id/eprint/165845

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