Seminars & Lectures
| * TITLE | Kondo Transport in a Mesoscopic System under Steady-state Nonequilbrium | ||||||
|---|---|---|---|---|---|---|---|
| * SPEAKERS | |||||||
|
|||||||
| * HOST(Applicant) | |||||||
|
|||||||
| * DATE / TIME | 2010-08-03, 04:30PM | ||||||
| * PLACE | Seminar room 512, APCTP Headquarters, POSTECH, Pohang, Korea | ||||||
| * ABSTRACT | |||||||
| Kondo transport in a two-electrode mesoscopic system under bias has unique properties because of two electron reservoirs and applied bias. The former yields two resonant tunneling levels in addition to the Kondo peak at the Fermi level if it exists and the latter assigns spectral weights to these resonant tunneling levels, which I call the steady-state resonant tunneling level (SSRTL) peaks. I explain various lineshapes of nonlinear conductance observed in a quantum point contact, a single-electron transistor with a quantum dot, and scanning tunneling microscopy on a magnetic atom adsorbed on a metallic substrate. The lineshapes comprise the Kondo-originated zero-bias anomaly and the SSRTL peaks. The latter has not been mentioned in previous studies. I present a novel Green’s function technique for obtaining the spectral function for a given bias, which is the key quantity to explain the nonlinear conductance under steady-state nonequilibrium conditions | |||||||
