We present a theoretical procedure with numerical demonstration of a workable and efficient method to evaluate the surface Green’s function of semi-infinite leads connected to a device. Such a problem always occurs in quantum transport calculations but also in the study of surfaces and heterojunctions. We show here that these semi-infinite leads can be properly described by real-energy Green’s functions obtained analytically by a smart solution of the Riccatimatrix equation. The performance of our method is demonstrated in the case of a multichain two-dimensional electron-gas system, composed of a central ribbon connected to two semi-infinite leads, pierced by two opposite magnetic fields.
|Autori interni:||GROSSO, GIUSEPPE|
|Autori:||M. Bravi;R. Farchioni;G. Grosso;G. Pastori Parravicini|
|Titolo:||Riccati equation for simulation of leads in quantum transport|
|Anno del prodotto:||2014|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.90.155445|
|Appare nelle tipologie:||1.1 Articolo in rivista|