2003/12/19 by E. A. Muljarov, R. Zimmermann · 1 citation
Engineering · Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Dephasing #Materials science #Mechanical and Optical Resonators #Phonon #Physics #Quadratic equation #Quantum #Quantum dot #Quantum mechanics #Semiconductor Lasers and Optical Devices #Semiconductor Quantum Structures and Devices #cond-mat
paper · pdf · doi:10.1103/physrevlett.93.237401
published as Phys. Rev. Lett. 93, 237401 (2004) · 4 pages, 2 figures
arxiv created 2003/12/19 · openalex publication_date 2004/11/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A microscopic theory of optical transitions in quantum dots with a carrier-phonon interaction is developed. Virtual transitions into higher confined states with acoustic phonon assistance add a quadratic phonon coupling to the standard linear one, thus extending the independent boson model. Summing infinitely many diagrams in the cumulant, a numerically exact solution for the interband polarization is found. Its full time dependence and the absorption line shape of the quantum dot are calculated. It is the quadratic interaction which gives rise to a temperature-dependent broadening of the zero-phonon line, calculated here for the first time in a consistent scheme.