# Seminar on Condensed Matter Theory

Group of Theoretical Physics at the Department of Condensed Matter Physics

of Charles University has a pleasure to invite you to attend the seminar

on 10th October 2024 at 13:10

at Faculty of Mathematics and Physics of Charles University, Ke Karlovu 5, 121 16 Praha 2

Seminar room **F 052**

### Sachin Verma, Ph.D.

#### Department of Condensed Matter Physics, CUNI

## Theoretical study of the thermoelectric transport across superconductor/ normal metal-quantum dot hybrid nanodevices

# Sachin Verma, Ph.D. » Theoretical study of the thermoelectric transport across superconductor/ normal metal-quantum dot hybrid nanodevices

*Department of Condensed Matter Physics, CUNI*

Please note that the seminar has been relocated to room F155KFM and will now begin at 13:10.

Location: seminar room F155KFM, Ke Karlovu 5

Using Keldysh's non-equilibrium Green's function formalism within different decoupling schemes in the equation of motion (EOM), we have analyzed thermoelectric transport properties of a single quantum dot (QD) coupled to Bardeen-Cooper-Schrieffer (BCS) superconductor (S) and/or normal metal (N). At the infinite-U limit, we will first present the linear and non-linear thermoelectric transport properties of the N-QD-N particle exchange heat engine. The infinite-U results in Coulomb blockade and weak coupling regime show a good quantitative agreement with recent experiments. Next, we will briefly highlight our results for a hybrid QD system in which a BCS superconductor replaces the normal metallic drain reservoir. The results show that the N-QD-S system exhibits a finite Seebeck and Peltier cooling effect, thus making it a promising candidate for low-temperature thermal applications such as quantum dot-based power generators, refrigerators, quantum heat valves, and rectifiers.