A density-matrix approach for the description of quantum-transport phenomena in systems with open boundaries is proposed. We shall show that the application of the conventional Wigner-function formalism within a source-term boundary-condition scheme leads to unphysical results, such as injection of coherent electronic states from the contacts. To overcome such basic limitations, we propose a generalization of the standard Weyl–Wigner formulation. The latter can be regarded as a quantum mechanical derivation of the phenomenological injection model commonly employed in the simulation of open quantum devices.
Generalized Weyl–Wigner formalism for the simulation of open quantum devices: a density-matrix approach / Zaccaria RP.; Rossi F.. - In: SEMICONDUCTOR SCIENCE AND TECHNOLOGY. - ISSN 0268-1242. - 19:4(2004), pp. S257-S259. [10.1088/0268-1242/19/4/086]
|Titolo:||Generalized Weyl–Wigner formalism for the simulation of open quantum devices: a density-matrix approach|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/0268-1242/19/4/086|
|Appare nelle tipologie:||1.1 Articolo in rivista|