Abstract
Various causes for negative differential conductance in transport through an interacting double quantum dot
are investigated. Particular focus is given to the interplay between the renormalization of the energy levels due
to the coupling to the leads and the decoherence of the states. The calculations are performed within a basis of
many-particle eigenstates and we consider the dynamics given by the von Neumann equation taking into
account also processes beyond sequential tunneling. A systematic comparison between the levels of approximation
and also with different formalisms is performed. It is found that the current is qualitatively well
described by sequential processes as long as the temperature is larger than the level broadening induced by the
contacts.
Original language | English |
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Journal | Physical Review B Condensed Matter |
Volume | 75 |
Pages (from-to) | 235314 |
ISSN | 0163-1829 |
DOIs | |
Publication status | Published - 2007 |
Externally published | Yes |