Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Quantum Dots, Quantum Wires, Point Contacts I (organized by TT)
TT 9.11: Vortrag
Montag, 31. März 2014, 12:15–12:30, BEY 81
The electroluminescence of the transmission line driven by a biased quantum point contact — •Jinshuang Jin1,2,3, Michael Marthaler2,4, Andreas Heimes2,4, and Gerd Schön2,4 — 1Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Karlsruhe, Germany — 2Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology(KIT), Karlsruhe, Germany — 3Department of Physics, Hangzhou Normal University, Hangzhou, China — 4DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, Karlsruhe, Germany
A transmission line resonator driven by a biased quantum point contact is investigated. The quantum point contact (QPC) is not only an efficient detector but also a light emission device. We find that the excited photon number in the resonator is monotonically increased with the bias voltage for eV>ℏωr with V the applied bias voltage and ℏωr the frequency of the resonator. The linewidth and the height of the emission spectrum are sensitive to the parameters of the QPC, such as the tunneling rate, the applied bias voltage, and the coupling strength between the QPC and resonator. Moreover, we demonstrate that the noise spectrum of the current through QPC has characteristic features showing peak and dip, which is closely related to the excited photon dynamics of the resonator.