# Adiabatic Thermal Radiation Pumps for Thermal Photonics

## TL;DR

This paper introduces a method to control and enhance thermal radiation directionality and magnitude between bodies at equilibrium using adiabatic pumping and wave interference, with practical circuit validation.

## Contribution

It presents a novel approach employing adiabatic pumping and scattering matrix analysis to manipulate thermal radiation directionality at equilibrium, highlighting the role of wave interference.

## Key findings

- Adiabatic pumping can significantly enhance directional heat transfer.
- Wave interference is critical in controlling thermal radiation.
- Experimental circuit setup confirms theoretical predictions.

## Abstract

We control the direction and magnitude of thermal radiation, between two bodies at equal temperature (in thermal equilibrium), by invoking the concept of adiabatic pumping. Specifically, within a resonant near-field electromagnetic heat transfer framework, we utilize an {\it instantaneous} scattering matrix approach to unveil the critical role of wave interference in radiative heat transfer. We find that appropriately designed adiabatic pumping cycling near diabolic singularities can dramatically enhance the efficiency of the directional energy transfer. We confirm our results using a realistic electronic circuit set-up.