Dhar, Abhishek ; Sen, Diptiman (2006) Nonequilibrium Green's function formalism and the problem of bound states Physical Review B: Condensed Matter and Materials Physics, 73 (8). 085119_1-085119_14. ISSN 1098-0121
|
PDF
- Author Version
369kB |
Official URL: http://prb.aps.org/abstract/PRB/v73/i8/e085119
Related URL: http://dx.doi.org/10.1103/PhysRevB.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.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 45554 |
Deposited On: | 28 Jun 2011 05:44 |
Last Modified: | 18 May 2016 01:47 |
Repository Staff Only: item control page