Related Experiment Video
Updated: Jun 12, 2026

Comparative Study of Simulation of Temperature Rise in Ring Main Unit
Published on: July 5, 2024
Berry-phase-induced heat pumping and its impact on the fluctuation theorem
Jie Ren1, Peter Hänggi, Baowen Li
1NUS Graduate School for Integrative Sciences and Engineering, Singapore 117456, Republic of Singapore. renjie@nus.edu.sg
Abstract:
Applying adiabatic, cyclic two-parameter modulations we investigate quantum heat transfer across an anharmonic molecular junction contacted with two heat baths. We demonstrate that the pumped heat typically exhibits a Berry-phase effect in providing an additional geometric contribution to heat flux. Remarkably, a robust fractional quantized geometric phonon response is identified as well. The presence of this geometric phase contribution in turn causes a breakdown of the fluctuation theorem of the Gallavotti-Cohen type for quantum heat transfer. This can be restored only if (i) the geometric phase contribution vanishes and if (ii) the cyclic protocol preserves the detailed balance symmetry.
Related Concept Videos
Phase Changes
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
The Phase Rule
Phase Transitions
Phase Transitions
Heating and Cooling Curves
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
Entropy Changes Accompanying Specific Processes

