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Stable Skyrmions in SU(2) gauged Bose-Einstein condensates
Takuto Kawakami1, Takeshi Mizushima, Muneto Nitta
1Department of Physics, Okayama University, Okayama 700-8530, Japan.
Physical Review Letters
|October 4, 2012
Summary
Three-dimensional Skyrmions, elusive topological objects, spontaneously form in Bose-Einstein condensates with non-Abelian gauge fields. These findings offer a unified understanding and potential experimental realization of novel quantum states.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Bose-Einstein Condensates
Background:
- Topological objects like Skyrmions are crucial in condensed matter physics.
- Three-dimensional Skyrmions have remained experimentally elusive.
- Bose-Einstein condensates (BECs) offer a versatile platform for studying quantum phenomena.
Purpose of the Study:
- To demonstrate the spontaneous emergence of three-dimensional Skyrmions.
- To investigate the behavior of Skyrmions in SU(2) symmetric BECs coupled with non-Abelian gauge fields.
- To explore the transition between different dimensional Skyrmions.
Main Methods:
- Theoretical modeling of SU(2) symmetric Bose-Einstein condensates.
- Inclusion of a three-dimensional non-Abelian gauge field, analogous to Rashba spin-orbit coupling.
- Analysis of winding numbers and helicity to identify topological structures.
Main Results:
- Spontaneous formation of three-dimensional Skyrmions as the ground state was demonstrated.
- A continuous transition from 3D to 1D/2D Skyrmions was observed upon modifying the gauge field's symmetry.
- All observed Skyrmions were unified under the concept of helical modulation.
Conclusions:
- The study theoretically establishes the existence of three-dimensional Skyrmions in BECs.
- The findings provide a unified framework for understanding various dimensional Skyrmions.
- These topological objects may be experimentally achievable in two-component BECs.
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