Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 70: Quantum Dots and Wires: Theory

HL 70.1: Talk

Thursday, March 17, 2011, 10:15–10:30, POT 151

Lasing and transport properties in a coupled dot-resonator system — •Peiqing Jin, Michael Marthaler, Jared Cole, and Gerd Schön — Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany

The study of the interaction between light and matter at the quantum level is of great interest for quantum information. We investigate a system consisting of double quantum dots coupled to an electrical resonator. A pumping scheme induced by the incoherent tunneling between electrodes and dots is considered. For small tunneling rates, the system reaches the non-classical regime where the radiation field exhibits sub-Poissonian statistics. In this regime, the peak of the current through the double dots, which appears at resonance, is almost the same at charge resonance.

The spin degree of freedom is involved when an external magnetic field is present. The difference between the effective magnetic fields provided by nuclear spins in each dot leads to an asymmetry between the two spin channels. Different behavior of the radiation field at the resonance of each spin channel is discussed.