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TT: Fachverband Tiefe Temperaturen
TT 89: Transport: Quantum Dots, Quantum Wires, Point Contacts 1 (jointly with HL)
TT 89.2: Vortrag
Donnerstag, 19. März 2015, 11:15–11:30, A 053
Photon creation of a double quantum dot strongly coupled to the environment — •Michael Marthaler1, Yasuhiro Utsumi2, and Dmitri Golubev3 — 1Institut für Theoretische Festkörperphysik , Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — 2Department of Physics Engineering, Faculty of Engineering, Mie University, Japan — 3O.V. Lounasmaa Laboratory, Aalto University School of Science, Finnland
We study a model which can describe a double quantum dot coupled to a transmission-line resonator. The charge eigenstates of the double dot couple strongly to the electromagnetic environment or phonons. We consider a situation where a transport voltage is applied and photons are created in the transmission-line resonator. Here we study the dependence of the average photon number in the resonator on the spectral function of the electromagnetic environment. We focus on three important cases, a strongly coupled environment with a small cut-off frequency, a structured environment peaked at a specific frequency and 1/f noise. We find that the electromagnetic environment can have a substantial impact on the photon creation. Resonance peaks are in general broadened and additional resonances can appear.