Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 4: Transport: Quantum Dots, Quantum Wires, Point Contacts I (TT jointly with O)

O 4.11: 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 Jin^1,2,3, Michael Marthaler^2,4, Andreas Heimes^2,4, and Gerd Schön^2,4 — 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>ℏω_r with V the applied bias voltage and ℏω_r 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.