Velocity selective trapping of atoms in a frequency-modulated standing laser wave

TL;DR

This paper demonstrates that frequency modulation of a standing laser wave can selectively trap atoms with specific velocities, reducing their wave packet splitting and potentially narrowing atomic velocity distributions in experiments.

Contribution

It introduces a novel method of velocity-selective atomic trapping using frequency-modulated standing waves, enhancing control over atomic motion.

Findings

Frequency modulation suppresses wave packet splitting for certain velocities.

Atoms with specific velocities remain localized longer.

The method can narrow atomic velocity distributions in experiments.

Abstract

The wave function of a moderately cold atom in a stationary near-resonant standing light wave delocalizes very fast due to wave packet splitting. However, we show that frequency modulation of the field may suppress packet splitting for some atoms having specific velocities in a narrow range. These atoms remain localized in a small space for a long time. We propose that in a real experiment with cold atomic gas this effect may decrease the velocity distribution of atoms (the field traps the atoms with such specific velocities while all other atoms leave the field)