Nonequilibrium Greens function formalism and the problem of bound states

Dhar, Abhishek and Sen, Diptiman (2006) Nonequilibrium Greens function formalism and the problem of bound states. In: Physical Review B, 73 (8). 085119-1-085119-14.

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Abstract

The nonequilibrium Green's function formalism for infinitely extended reservoirs coupled to a finite system can be derived by solving the equations of motion for a tight-binding Hamiltonian. While this approach gives the correct density for the continuum states, we find that it does not lead, in the absence of any additional mechanisms for equilibration, to a unique expression for the density matrix of any bound states which may be present. Introducing some auxiliary reservoirs which are very weakly coupled to the system leads to a density matrix which is unique in the equilibrium situation, but which depends on the details of the auxiliary reservoirs in the nonequilibrium case.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to American Physical Society.
Keywords:	mesoscopic systems;Green's function methods;bound states;tight-binding calculations.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	02 Apr 2009 05:58
Last Modified:	19 Sep 2010 04:59
URI:	http://eprints.iisc.ernet.in/id/eprint/17990

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