Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.6: Poster
Thursday, March 14, 2013, 15:00–19:00, Poster D
Measurement back-action on the dynamics of an interacting quantum dot — •Jens Schulenborg1, L.Debora Contreras-Pulido2, Janine Splettstoesser1, and Michele Governale3 — 1Institut für Theorie der Statistischen Physik, RWTH Aachen University, Germany — 2Institute of Theoretical Physics, Ulm University, Germany — 3School of Physical and Chemical Sciences, Victoria University of Wellington, New Zealand
Due to potential applications in nanoelectronics, metrology and quantum information, the study of the dynamics of quantum dots has attracted great interest over the past years. Recently, the relaxation rates in the dynamical response of an interacting single-level quantum dot, weakly tunnel coupled to an electronic reservoir and initially brought out of equilibrium, have been investigated [1].
The theoretical study presented on this poster focuses on the readout of the dynamic response of the quantum dot, capacitively coupled to a measuring device. In particular, the influence of measurement back-action effects on the dot’s time-evolution is addressed. Starting from a master equation approach for the quantum dot coupled to the measuring device, the relaxation behavior of the dot (influenced by the measurement) is extracted.
The result shows that the back-action of the measurement leads to a significant modification of the dot’s relaxation rate for gate voltages close to the electron-hole symmetric point. On top of that, an additional rate governs the time-evolution of the quantum dot, which is closely related to the characteristics of the measuring device.
[1] L. D. Contreras-Pulido et al., Phys. Rev. B 85, 075301 (2012).