Topology-controlled thermopower oscillations in multiterminal Andreev interferometers

TL;DR

This paper theoretically explores how the thermopower oscillates with magnetic flux in six-terminal Andreev interferometers, highlighting the influence of system topology and various quantum effects on these oscillations.

Contribution

It introduces a comprehensive theoretical analysis of thermopower oscillations in multiterminal Andreev interferometers, emphasizing the impact of topology and multiple quantum effects.

Findings

Thermopower oscillates with magnetic flux due to Josephson-like and Aharonov-Bohm-like effects.

System topology significantly influences the behavior of thermopower oscillations.

The relative contributions depend on temperature, voltage bias, and Thouless energy.

Abstract

We theoretically investigate coherent oscillations of the thermopower $\mathcal{S}$ as a function of the magnetic flux $\Phi$ in six-terminal Andreev interferometers. We demonstrate that the thermopower behavior is determined by a number of contributions originating from the Josephson-like and Aharonov-Bohm-like effects as well as from electron-hole asymmetry. The relative weight of these contributions depends on the relation between temperature, voltage bias and an effective Thouless energy of our setup. We particularly emphasize the role of the system topology that may have a dramatic impact on the behavior of $\mathcal{S}(\Phi)$.