Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Transport: Quantum dots, quantum wires, point contacts II (organized by TT)

HL 25.6: Vortrag

Montag, 31. März 2014, 17:30–17:45, HSZ 204

Detection of the decay rates in interacting quantum dots — •Jens Schulenborg1,2, L. Debora Contreras- Pulido3, Michele Governale4, and Janine Splettstoesser1,21Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Göteborg, Sweden — 2Institut für Theorie der Statistischen Physik, RWTH Aachen University, Germany — 3Institut für Theoretische Physik, Universität Ulm, Germany — 4School of Physical and Chemical Sciences, Victoria University of Wellington, New Zealand

Over the past years, potential applications in nanoelectronics, metrology and quantum information sparked great interest in studying the dynamics of time-dependently driven quantum dots. Recently, the relaxation rates in the dynamical response of an interacting single-level quantum dot, weakly tunnel coupled to an electronic reservoir and brought out of equilibrium by a step pulse, have been investigated [1].

This theoretical work focuses on the readout of these relaxation rates with a capacitively coupled sensor quantum dot (SQD). Using a generalized master equation approach for the combined system of dot and SQD, we investigate the measurability of the dot relaxation behavior via the SQD current, especially accounting for back-action effects.

Our results reveal parameter regimes in which back-action leads to a decrease of the dot decay rates and to a mixing of relaxation modes that decay independently in the absence of a measurement. However, avoiding these regimes, we show that the original dot rates can still be extracted from the SQD current.
L. D. Contreras-Pulido et al., Phys. Rev. B 85, 075301 (2012).

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