October 1, 2013 at 11:00 am

CMSS Colloquium: Transport Spectroscopy of Kondo Dynamics in Single-Electron Transistor, Oct. 31

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.

CMSS Colloquia“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.”

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