The Condensed Matter & Surface Sciences Colloquium series presents Dr. Andrei Kogan of the University of Cincinnati on “Transport spectroscopy of Kondo dynamics in a single-electron transistor” on Thursday, Oct. 31, at 4:10 p.m. in Walter 245.
Kogan is Assistant Professor of Physics at the University of Cincinnati.
“Kondo states are coherent many-body singlets formed by an electron confined to a site surrounded by free electrons in a metal,” he says in his abstract. “A characteristic feature of a Kondo state is a hierarchical set of energies of electrons building up the collective Kondo resonance that leads to a universal dependence of many physical properties on external fields and the intrinsic many body energy scale, the so called Kondo temperature.
“Using a Single-Electron transistor, a voltage-controllable electron trap, we explore the behavior of the Kondo state under a time-dependent perturbation. We show that at frequencies of order of the Kondo temperature divided by Planck’s constant, current flow across a Kondo-correlated transistor becomes non-adiabatic which suggests that the Kondo temperature may define a universal many-body frequency scale, as has been theoretically proposed.”
Comments