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Phases of atom-molecule vortex matter.

S J Woo¹, Q-Han Park, N P Bigelow

¹Department of Physics and Astronomy, University of Rochester, Rochester, New York, USA.

Physical Review Letters

|June 4, 2008

Summary

We discovered that atomic and molecular Bose-Einstein condensates can form composite vortices resembling carbon dioxide molecules. These structures exhibit phase transitions influenced by system rotation and physical parameters.

Area of Science:

Quantum physics
Condensed matter physics
Atomic physics

Background:

Bose-Einstein condensates (BECs) are quantum states of matter formed by cooling atoms to near absolute zero.
Vortices in BECs are quantized rotational excitations with unique topological properties.
Atom-molecule BECs offer a platform to study the interplay between different quantum species.

Purpose of the Study:

To investigate ground state vortex configurations in rotating atom-molecule Bose-Einstein condensates.
To explore the formation of composite vortex structures due to coherent coupling.
To analyze structural phase transitions of vortex lattices under varying physical parameters.

Main Methods:

Theoretical modeling of a two-component Bose-Einstein condensate.

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Numerical simulations to determine ground state vortex configurations.

Analysis of vortex lattice structures and their stability.

Main Results:

Coherent coupling between atomic and molecular condensates leads to paired vortices.
These paired vortices form composite structures analogous to carbon dioxide molecules.
Vortex lattice structures undergo phase transitions with changes in rotational frequency and other physical parameters.

Conclusions:

Atom-molecule BECs provide a novel system for creating complex quantum structures.
The observed composite vortices demonstrate a unique pairing mechanism driven by inter-species coupling.
Understanding these vortex phase transitions is crucial for controlling quantum states in multi-component condensates.