Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-08-26
Europhysics Letters 84, 67001 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 2 figures
Scientific paper
10.1209/0295-5075/84/67001
We study time-dependent quantum transport in a correlated model system by means of time-propagation of the Kadanoff-Baym equations for the nonequilibrium many-body Green function. We consider an initially contacted equilibrium system of a correlated central region coupled to tight-binding leads. Subsequently a time-dependent bias is switched on after which we follow in detail the time-evolution of the system. Important features of the Kadanoff-Baym approach are 1) the possibility of studying the ultrafast dynamics of transients and other time-dependent regimes and 2) the inclusion of exchange and correlation effects in a conserving approximation scheme. We find that initial correlation and memory terms due to many-body interactions have a large effect on the transient currents. Furthermore the value of the steady state current is found to be strongly dependent on the approximation used to treat the electronic interactions.
Leeuwen Robert van
Myöhänen Petri
Stan Adrian
Stefanucci Gianluca
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