Transmission of heat modes across a potential barrier

TL;DR

This paper investigates how neutral heat-carrying modes transmit across quantum point contacts in fractional quantum Hall states, revealing universal heat flow structures and enabling advanced thermal management in quantum devices.

Contribution

It demonstrates the transmission behavior of upstream neutral modes in fractional quantum Hall states and maps their spatial distribution relative to charged modes, confirming theoretical predictions.

Findings

Upstream neutral modes flow with the inner charge mode.

Neutral modes are transmitted through quantum point contacts in fractional states.

Results reveal a universal structure of upstream heat currents.

Abstract

Controlling the transmission of electrical current using a quantum point contact constriction paved a way to a large variety of experiments in mesoscopic physics. The increasing interest in heat transfer in such systems fosters questions about possible manipulations of quantum heat modes that do not carry net charge(neutral modes). Here, we study the transmission of upstream neutral modes through a quantum point contact in fractional hole-conjugate quantum Hall states. Employing two different measurement techniques, we were able to render the relative spatial distribution of these chargeless modes with their charged counter-parts. In these states, which were found to harbor more than one downstream charge mode, the upstream neutral modes are found to flow with the inner charge mode - as theoretically predicted. These results unveil a universal upstream heat current structure and open the path for more complex engineering of heat flows and cooling mechanisms in quantum nano-electronic devices.