Nonequilibrium transport through coupled quantum dots with electron phonon interaction

Details Nonequilibrium transport through coupled quantum dots with electron phonon interaction Nonequilibrium transport through coupled quantum dots with electron phonon interaction

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9..119u&link_type=abstract

New Journal of Physics, Volume 9, Issue 5, pp. 119 (2007).

Physics

7

Scientific paper

We theoretically study transport properties of coupled quantum dots in parallel in the presence of electron phonon (e ph) interaction. Nonequilibrium transport under finite bias is calculated using the Keldysh Green function method. Firstly, we examine a double-dot interferometer with a penetrating magnetic flux (Aharonov Bohm phase phiv) between the two quantum dots. The differential conductance shows a sharp dip between double resonant peaks, as a function of energy levels in the quantum dots, when the two dots are equivalently coupled to external leads and 0 < phiv < π. The e ph interaction significantly decreases the dip, reflecting an emission of phonons from one of the quantum dots. This dephasing effect is more prominent under larger bias voltage. Secondly, we study a T-shaped double-dot system in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). The differential conductance shows a dip between two resonant peaks, as in the double-dot interferometer. The dip is weakly reduced by an emission of phonons from dot 2. Phonon emission from dot 1 does not result in dephasing and hence does not influence the dip. Therefore the dip of the conductance is more robust against the e ph interaction in the T-shaped double-dot system than in the double-dot interferometer.

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