Please use this identifier to cite or link to this item:
|Title:||Nonequilibrium Keldysh formalism for interacting leads-Application to quantum dot transport driven by spin bias|
|Citation:||Li, Y., Jalil, M.B.A., Tan, S.G. (2012-06). Nonequilibrium Keldysh formalism for interacting leads-Application to quantum dot transport driven by spin bias. Annals of Physics 327 (6) : 1484-1493. ScholarBank@NUS Repository. https://doi.org/10.1016/j.aop.2012.01.003|
|Abstract:||The conductance through a mesoscopic system of interacting electrons coupled to two adjacent leads is conventionally derived via the Keldysh nonequilibrium Green's function technique, in the limit of noninteracting leads [Y.Meir, N.S.Wingreen, Phys. Rev. Lett. 68 (1992) 2512]. We extend the standard formalism to cater for a quantum dot system with Coulombic interactions between the quantum dot and the leads. The general current expression is obtained by considering the equation of motion of the time-ordered Green's function of the system. The nonequilibrium effects of the interacting leads are then incorporated by determining the contour-ordered Green's function over the Keldysh loop and applying Langreth's theorem. The dot-lead interactions significantly increase the height of the Kondo peaks in density of states of the quantum dot. This translates into two Kondo peaks in the spin differential conductance when the magnitude of the spin bias equals that of the Zeeman splitting. There also exists a plateau in the charge differential conductance due to the combined effect of spin bias and the Zeeman splitting. The low-bias conductance plateau with sharp edges is also a characteristic of the Kondo effect. The conductance plateau disappears for the case of asymmetric dot-lead interaction. © 2012 Elsevier Inc.|
|Source Title:||Annals of Physics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Aug 14, 2018
WEB OF SCIENCETM
checked on Aug 7, 2018
checked on Mar 12, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.