[Phys-seminars] 2017-04-24 Condensed Matter Seminar

manassen manassen at bgu.ac.il
Sat Apr 15 12:00:25 IDT 2017

Condensed Matter Seminar

 DATE: 24-04-17

 TIME: 11:30

 PLACE: Physics building (#54) room 207

Thermoelectric Transport through SU(N) Kondo Impurity

Mikhail Kiselev, The Abdus Salam International Center for Theoretical Physics, Trieste, Italy

We investigate thermoelectric transport through a SU(N) quantum impurity in the Kondo regime. The strong coupling fixed point theory is described by the local Fermi-liquid 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 non-linear effects in temperature drop at low temperatures. We illustrate the significance of the non-linearities for enhancement of thermopower by two examples of SU(4) symmetric regimes characterized by a filling factor m: i) particle-hole symmetric at m=2 and ii) particle-hole non-symmetric 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.

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