Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 84: Quantum Dots and Wires: Transport Properties III (mainly Thermal Gradients)

HL 84.1: Vortrag

Donnerstag, 29. März 2012, 15:00–15:15, EW 202

Nanocaloritronics of thermoelectric transport across interacting quantum dots. — •Bhaskaran Muralidharan and Milena Grifoni — Institut I - Theoretische Physik Universität Regensburg D-93040 Regensburg

By subjecting a weakly coupled quantum dot system to an applied voltage and temperature gradient, we present notable subtleties involved in its thermoelectric energy conversion efficiency. First, is the well known, but non-intuitive aspect in the non-interacting case, of achieving a reversible operation with Carnot efficiency. Second, is the rather surprising result in the presence of Coulomb interactions that similar operating conditions lead to zero efficiency [1]. It is then shown that even in this case, operating efficiencies close to the Carnot value may be attained, but, under non-equilibrium conditions [1]. Consequently, the inadequacies of traditionally employed performance metric zT in capturing the aforementioned non-equilibrium conditions are pointed out.

Reference:

[1]"Nanocaloritronic performance analysis of an interacting quantum dot thermoelectric", B. Muralidharan and M. Grifoni, cond-mat/1110.4357 (2011).