Activities

Seminars
Seminar on Theoretical and Computational Physics:
 Title  Thermoelectrics of a Quantum Impurity


Speaker  Prof. Mikhail Kiselev


Affiliation  The Abdus Salam International Centre for Theoretical Physics


Date  Thursday, 14112019


Time  10:00 AM


Location  Room 62, 6th floor, 2H building, 18 Hoang Quoc Viet, Cau Giay, Ha Noi


Abstract  We investigate thermoelectric transport through a SU(N) quantum impurity in the Kondo regime. The strongcoupling fixedpoint theory is described by the local Fermiliquid paradigm. Using Keldysh technique we analyze the electric current through the quantum impurity at both finite bias voltage and finite temperature drop across it. The theory of a steady state at zero current provides a complete description of the Seebeck effect. We find pronounced nonlinear effects in temperature drop at low temperatures. We illustrate the significance of the nonlinearities for enhancement of thermopower by two examples of SU(4) symmetric regimes characterized by a filling factor m:
(i) particlehole symmetric at m=2 and
(ii) particlehole nonsymmetric at m=1. We analyze the effects of potential scattering and coupling asymmetry on the transport coefficients. We discuss connections between the theory and transport experiments with coupled quantum dots and carbon nanotubes.


Host person  Nguyễn Thị Kim Thanh


