ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

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.

[img] PDF
5.pdf - Published Version
Restricted to Registered users only

Download (440kB) | Request a copy
Official URL: http://scitation.aip.org/getpdf/servlet/GetPDFServ...


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
Publication: Physical Review B
Publisher: American Physical Society
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.ac.in/id/eprint/17990

Actions (login required)

View Item View Item