Bogoliubov-Cherenkov Radiation in an Atom Laser

TL;DR

This paper introduces a technique to observe Bogoliubov-Cherenkov radiation in a pulsed atom laser interacting with a Bose-Einstein condensate, revealing characteristic patterns and enabling studies of relativistic quantum phenomena.

Contribution

It presents a new experimental method to generate and analyze Bogoliubov-Cherenkov radiation in a highly hypersonic atom laser system, supported by theoretical and numerical validation.

Findings

Observation of twin jet and interference patterns in the atom laser

Excellent agreement between experiments, simulations, and theory

Platform for future relativistic quantum electrodynamics analogs

Abstract

We develop a simple yet powerful technique to study Bogoliubov-Cherenkov radiation by producing a pulsed atom laser from a strongly confined Bose-Einstein condensate. Such radiation results when the atom laser pulse falls past a Bose-Einstein condensate at high-hypersonic speeds, modifying the spatial profile to display a characteristic twin jet structure and a complicated interference pattern. The experimental observations are in excellent agreement with mean-field numerical simulations and an analytic theory. Due to the highly hypersonic regime reached in our experiment, this system offers a highly controllable platform for future studies of condensed-matter analogs of quantum electrodynamics at ultrarelativistic speeds.