Heavily Enhanced Dynamic Stark Shift in a System of Bose Einstein Condensation of Photons

TL;DR

This paper investigates how the dynamic Stark shift of an atom is significantly enhanced in a Bose-Einstein condensate of photons, with the shift being temperature-dependent and larger than in free space, revealing new quantum electrodynamics effects.

Contribution

It introduces a theoretical analysis of the dynamic Stark shift in photonic BEC, highlighting the temperature dependence and the enhancement compared to normal photonic fluids.

Findings

Stark shift is increased in photonic BEC compared to free space.

The shift depends on temperature within the BEC system.

Physical explanation for the enhancement is provided.

Abstract

The dynamic Stark shift of a high-lying atom in a system of Bose Einstein condensation (BEC) of photons is discussed within the framework of nonrelativistic quantum electrodynamics (QED) theory. It is found that the Stark shift of an atom in BEC of photons is modified by a temperature dependent factor, compared to that in a normal two-dimensional photonic fluid. In photonic BEC, the value of Stark shift is always greater than that in two-dimensional free space. Physical origin of the phenomenon is presented and potential application is also discussed.