Symmetry breaking and phase transitions in Bose-Einstein condensates with spin–orbital-angular-momentum coupling
| Autor: | Y. Duan, Andrey Surzhykov, Y. M. Bidasyuk |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Phase transition FOS: Physical sciences Quantum phases 01 natural sciences 010305 fluids & plasmas law.invention symbols.namesake Quantum Gases (cond-mat.quant-gas) law Quantum mechanics 0103 physical sciences Angular momentum coupling symbols Symmetry breaking Condensed Matter - Quantum Gases 010306 general physics Ground state Hamiltonian (quantum mechanics) Wave function Bose–Einstein condensate |
| Zdroj: | Physical Review A. 102 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | Theoretical study is presented for a spinor Bose-Einstein condensate, whose two components are coupled by copropagating Raman beams with different orbital angular momenta. The investigation is focused on the behavior of the ground state of this condensate, depending on the atom-light coupling strength. By analyzing the ground state, we have identified a number of quantum phases, which reflect the symmetries of the effective Hamiltonian and are characterized by the specific structure of the wave function. In addition to the well-known stripe, polarized, and zero-momentum phases, our results show that the system can support phases whose wave functions contain a complex vortex molecule. Such a molecule plays an important role in the continuous phase transitions of the system. The predicted behavior of vortex-molecule phases can be examined in cold-atom experiments using currently existing techniques. |
| Databáze: | OpenAIRE |
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