Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.3: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Time-domain interferometry with single quantum dots — •Alexander Croy and Ulf Saalmann — Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany

Coherent control of nanoscale devices is one of the main topics of current research on electron transport in systems on the nanometer scale. A very successful method for the coherent manipulation of charge and spin qubits in double quantum dots consists in using nearly rectangular voltage pulses. Moreover, recent experiments demonstrate that the creation of high-frequency pulse trains is feasible, which paves the way for observing new coherent transport phenomena.
Here we present numerical and analytical results demonstrating the influence of such pulse trains on the time-averaged occupation of a single quantum dot and the currents through the system. For very high and low frequencies coherent destruction of tunneling and adiabatic transport can be observed, respectively. Additionally, we consider random voltage pulse-trains given by a random telegraph process. In this case the coherent features cannot be observed.