Light emission properties in a double quantum dot molecule immersed in a cavity: Phonon-assisted tunneling

• Published in: Physics letters. A 2020-01, Vol.384 (3), p.126076, Article 126076
• Main Authors: Vargas-Calderón, Vladimir, Vinck-Posada, Herbert
• Format: Article
• Language: English
• Subjects: Double quantum dot; Light-matter interaction; Phonon-assisted tunneling; Second-order coherence function
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2019.126076

•Regimes of low and high tunneling are characterized by mean excitation numbers.•Phonon-assisted tunneling acts as order parameter of a dynamical phase transition.•High phonon-assisted tunneling rates destroy PL spectroscopic resolution.•Second order-coherence function shows anti-bunched light for low coherent tunneling and PhAT rates. Two main mechanisms dictate the tunneling process in a double quantum dot: overlap of excited wave functions, effectively described as a tunneling rate, and phonon-assisted tunneling. In this paper, we study different regimes of tunneling that arise from the competition between these two mechanisms in a double quantum dot molecule immersed in a unimodal optical cavity. We show how such regimes affect the mean number of excitations in each quantum dot and in the cavity, the spectroscopic resolution and emission peaks of the photoluminescence spectrum, and the second-order coherence function which is an indicator of the quantumness of emitted light from the cavity.