Programme

P.1 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Impact of Channel Asymmetry on Thermoelectric Transport in a Two-Channel Charge Kondo System

H. Q. Nguyen (1), T. K. T. Nguyen (1), T. B. Cao (1), T. A. Chu (1), T. L. H. Nguyen (1), and M. N. Kiselev (2)

(1) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam (2) The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, I-34151, Trieste, Italy

We theoretically revisit an asymmetric two-channel charge Kondo model, previously studied in Phys. Rev. B 82, 113306 (2010), in the context of its experimental realization reported in Z. Iftikhar et al., Nature (London) 526, 233 (2015). The nano-device under consideration consists of a large metallic quantum dot embedded in a two-dimensional electron gas (2DEG), strongly coupled to two electrodes via nearly transparent single-mode quantum point contacts (QPCs). The 2DEG is in the integer quantum Hall regime, with asymmetric reflection amplitudes at the QPCs. We find that the thermopower and figure of merit are reduced by the channel asymmetry, while the Kondo resonance width and the Lorenz number near the Coulomb peak are enhanced. Finally, we propose a method to improve the thermoelectric efficiency of the device.

Presenter: Nguyen Hong Quang