Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.28: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Finite-Frequency Noise of a Time-Dependently Driven and Interacting Quantum Dot — •Niklas Dittmann1,2,3 and Janine Splettstoesser3 — 1Institute for Theory of Statistical Physics, RWTH Aachen University, Germany — 2Peter-Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, Germany — 3Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Gothenburg, Sweden
We derive the current-noise spectrum stemming from a quantum dot weakly tunnel-coupled to a nearby electronic reservoir and driven by a time-dependent gate voltage. This experimentally relevant setup is frequently applied as an on-demand emitter of single electrons into a mesoscopic conductor. The presence of Coulomb interaction poses an additional challenge for a theoretical description. In this work, we extend a real-time diagrammatic technique to obtain the symmetric finite-frequency current noise. The derived noise spectrum reveals a rich interplay between different energy scales of this system, defined by the interaction strength, the tunnel-coupling strength, the temperature and the driving frequency. We discuss how the noise frequency probes features related to these energy scales.