2009/12/28 by Ulrich Hohenester · 4 citations
Computer Science · Physics and Astronomy · #Biexciton #Cavity quantum electrodynamics #Condensed matter physics #Exciton #Fermi Gamma-ray Space Telescope #Fermi's golden rule #Hamiltonian (control theory) #Open quantum system #Phonon #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Scattering #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.81.155303
published as Phys. Rev. B 81, 155303 (2010) · 15 pages, 10 figures
arxiv created 2009/12/28 · openalex publication_date 2010/04/02 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
For a semiconductor quantum dot strongly coupled to a microcavity, we theoretically investigate phonon-assisted transitions from the exciton to a cavity photon, where the energy mismatch is compensated by phonon emission or absorption. By means of a Schrieffer-Wolff transformation we derive an effective Hamiltonian, which describes the combined effect of exciton-cavity and exciton-phonon couplings, and compute the scattering rates within a Fermi-golden-rule approach. The results of this approach are compared with those of a recently reported description scheme based on the independent boson model [U. Hohenester et al., Phys. Rev. B 80, 201311(R) (2009)] and a numerical density-matrix approach. All description schemes are shown to give very similar results. This demonstrates that phonon-assisted cavity feeding can be described in terms of a simple scattering process and does not require a non-Markovian treatment as suggested elsewhere. We present results for the spontaneous emission lifetime of a quantum dot initially populated with a single exciton or biexciton and for the spectral properties of an optically driven dot-cavity system operating in the strong-coupling regime. Our results demonstrate that phonon-assisted feeding plays a dominant role for strongly coupled dot-cavity systems when the detuning is of the order of a few millielectron volts.