Phonon Laser Effect and Dicke-Hepp-Lieb Superradiant Phase Transition in Magnetic Cantilever Coupled to a Bose Einstein Condensate

TL;DR

This paper explores a novel phonon laser mechanism using a Bose-Einstein condensate coupled to a magnetic cantilever, demonstrating controllable lasing and a superradiant phase transition influenced by atom interactions.

Contribution

It introduces a new phonon laser scheme based on magnetic coupling and analyzes the superradiant phase transition in this hybrid quantum system.

Findings

Phonon laser can be achieved via magnetic coupling-induced cantilever motion.

System exhibits controllable continuous wave or transient lasing.

Strong coupling leads to Dicke-Hepp-Lieb superradiant phase transition.

Abstract

We propose a possibility of a phonon laser by coupling a Bose-Einstein condensate to a nanomechanical cantilever with a magnetic tip. Due to the magnetic coupling, atomic spin flips induce cantilever motion which can be used to produce a phonon laser. The system is described by the equivalent of the Jaynes-Cummings Hamiltonian. By controlling the number of atoms and the population inversion, one can obtain either a continuous wave (cw) or transient lasing. The two-body atom-atom interaction is also shown to coherently manipulate the lasing process. We also show that in the strong coupling limit, the same system can undergo a Dicke-Hepp-Lieb superradiant phase transition. Exotic phase diagrams can be obtained by tuning the two body atom-atom interaction.