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Title: | Excitations of a supersolid annular stripe phase in a spin-orbital-angular-momentum-coupled spin-1 Bose-Einstein condensate |
Authors: | PARAMJEET BANGER Rajat Sandeep Gautam Dept. of Physics |
Keywords: | Cold atoms & matter waves Collective effects in atomic physics Spin-orbit coupling Spinor Bose-Einstein condensates 2025-MAR-WEEK4 TOC-MAR-2025 2025 |
Issue Date: | Feb-2025 |
Publisher: | American Physical Society |
Citation: | Physical Review A,111, 023311. |
Abstract: | We present a theoretical study of the collective excitations of the supersolid annular stripe phase of a spin-orbital-angular-momentum-coupled (SOAM-coupled) spin-1 Bose-Einstein condensate. The annular stripe phase simultaneously breaks two continuous symmetries, namely rotational and 𝑈(1) gauge symmetry, and is more probable in the condensates with a larger orbital angular momentum transfer imparted by a pair of Laguerre-Gaussian beams than what has been considered in the recent experiments. Accordingly, we consider a SOAM-coupled spin-1 condensate with a 4ℏ orbital angular momentum transferred by the lasers. Depending on the values of the Raman coupling strength and quadratic Zeeman term, the condensate with realistic antiferromagnetic interactions supports three ground-state phases: the annular stripe, the vortex necklace, and the zero angular momentum phase. We numerically calculate the collective excitations of the condensate as a function of coupling and quadratic Zeeman field strengths for a fixed ratio of spin-dependent and spin-independent interaction strengths. At low Raman coupling strengths, we observe a direct transition from the zero angular momentum to the annular stripe phase, characterized by the softening of a double symmetric roton mode, which serves as a precursor to supersolidity. |
URI: | https://doi.org/10.1103/PhysRevA.111.023311 http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9420 |
ISSN: | 2469-9934 2469-9926 |
Appears in Collections: | JOURNAL ARTICLES |
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