Faculty of Engineering and Natural Sciences
Steady State Kondo Phenomena in Mesoscopic Systems
Prof. Dr. Jongbae Hong
Department of Physics and Astronomy,
Max Planck Institute for Physics of Complex Systems,
The 0.7 conductance anomaly in a quantum point contact, various differential conductance line shapes in STM-Kondo systems, and the peak splitting under a magnetic field in a single- electron transistor with a quantum dot are long-standing problems in the area of mesoscopic physics. These Kondo-related transport phenomena are classified as the steady state Kondo phenomena. They have not been explained due to lack of relevant theory for the Kondo problem in a steady state. In this talk, I briefly review experimental results and discuss the key issue in the steady-state Kondo phenomena. Then, I will explain the basic ideas of my theoretical scheme that gives us a different point of view for Kondo physics. I show that the new physics in electron transport in a mesoscopic system under a steady state is the transport through the resonant tunneling levels (RTLs), which occur only when a bias is applied. That is the reason why the theory based on equilibrium state cannot explain these steady state phenomena. I explain all the features of the abovementioned experiments in terms of the RTLs.
January 20, 2010, 13:40,