Activities
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Seminars
| Seminar on Theoretical and Computational Physics:
| | Title | Thermoelectrics of a Quantum Impurity
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| Speaker | Prof. Mikhail Kiselev
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| Affiliation | The Abdus Salam International Centre for Theoretical Physics
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| Date | Thursday, 14-11-2019
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| Time | 10:00 AM
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| Location | Room 62, 6th floor, 2H building, 18 Hoang Quoc Viet, Cau Giay, Ha Noi
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| Abstract | 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 nonlinear 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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| Host person | Nguyễn Thị Kim Thanh
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