[APCTP JRG Seminar] Nonequilibrium Transport in the Anderson Model of a Biased Quantum Dot
* SPEAKERS
Name
Affiliation
E-mail
Mr. Sung Po Chao
Rutgers University, USA
Prof. Xin Wan (APCTP) xinwan(at)apctp.org
* HOST(Applicant)
Name
Affiliation
E-mail
-
* DATE / TIME
2010-01-12, 4:00pm
* PLACE
Seminar room 512, APCTP Headquarters, POSTECH, Pohang, Korea
* ABSTRACT
We derive the transport properties of a quantum dot subject to a source-drain bias at zero temperature and magnetic field. Using the Scattering Bethe Anstaz, a generalization of the traditional Thermodynamic Bethe Ansatz to open systems out of equilibrium, we derive exact results for the quantum dot occupation out of equilibrium and, by introducing phenomenological distribution function in current expectation value, obtain the differential conductance for large U/Γ. The Hamiltonian to describe the quantum dot system is the Anderson impurity Hamiltonian and the solutions of the equations are obtained numerically. We also vary the gate voltage and study the transition from the mixed valence to the Kondo regime in the presence of a nonequilibrium current. We conclude with the difficulty we encounter in this model and possible way to solve them without introducing phenomenological method.
