CMSP Seminar Series at ICTP Stasi Seminar Rm: Anton RAMSAK Thursday 9 March at 11:30

[Condensed Matter Section]

ICTP Seminar Series in Condensed Matter and Statistical Physics
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Thursday 9 March at 11:30 a.m.

Luigi Stasi Seminar Room, first floor, ICTP Leonardo building
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Speaker:
Anton RAMSAK ( Mathematics & Physics, University of Ljubljana, Slovenia)

Title:
Charge Thermopower and Conductance in Interacting Quantum Dot Structures

Abstract:
Charge thermopower in an interacting quantum dot coupled to the leads via
assisted hopping modifies the coupling to the two-particle state, which 
shifts
the Kondo exchange coupling constant and exponentially reduces or enhances
the Kondo temperature, breaks the particle-hole symmetry, and consequently
strongly affects the thermopower. The gate-voltage and temperature 
dependence
of the transport properties is discussed in various regimes. For a 
particular value
of the assisted hopping parameter a peculiar discontinuous behaviour and 
very
high Seebeck coefficient is found [1]. Similar discontinuous behaviour 
is found
in a triple quantum dot system exhibiting regular and singular Fermi liquid
transitions [2].

References:
(1) Effect of assisted hopping on thermopower in an interacting quantum dot,
S.B.Tooski, A.Ramsak, B.R.Bulka and R. Zitko, New J.Phys. 16, 055001 (2014).
(2) Regular and singular Fermi liquid in triple quantum dots: Coherent 
transport
studies, S.B.Tooski, A.Ramsak and B.R.Bulka, Physica E: Low-dimensional
Systems and Nanostructures 75, 345 (2016).