Dicke-Type Energy Level Crossings in Cavity-Induced Atom Cooling: Another Superradiant Cooling

TL;DR

This paper analyzes energy level crossings in a cavity-atom system and proposes a new superradiant cooling mechanism based on these crossings, independent of atomic photon absorption or emission.

Contribution

It introduces a mathematical foundation for a novel superradiant cooling method utilizing Dicke-type energy level crossings in cavity-atom systems.

Findings

Energy level crossings occur between weak and strong coupling regimes.

A new superradiant cooling mechanism is theoretically feasible.

Cooling can be achieved via cavity decay and atom position control without atomic photon absorption or emission.

Abstract

This paper is devoted to energy-spectral analysis for the system of a two-level atom coupled with photons in a cavity. It is shown that the Dicke-type energy level crossings take place when the atom-cavity interaction of the system undergoes changes between the weak coupling regime and the strong one. Using the phenomenon of the crossings we develop the idea of cavity-induced atom cooling proposed by the group of Ritsch, and we lay mathematical foundations of a possible mechanism for another superradiant cooling in addition to that proposed by Domokos and Ritsch. The process of our superradiant cooling can function well by cavity decay and by control of the position of the atom, at least in (mathematical) theory, even if there is neither atomic absorption nor atomic emission of photons.