Title:	Nonequilibrium Green's function formalism and the problem of bound states
Authors:	Dhar, Abhishek Sen, Diptiman
Issue Date:	28-Feb-2006
Publisher:	The American Physical Society
Citation:	Physical Review B, 2006, Vol.73, 085119
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.
URI:	http://hdl.handle.net/2289/1211
ISSN:	1098-0121 1550-235X (online)
Alternative Location:	http://link.aps.org/abstract/PRB/v73/e085119 http://arxiv.org/abs/cond-mat/0510303
Copyright:	(2006) by the American Physical Society
Appears in Collections:	Research Papers (TP)

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