Work

Vortex phases and domain walls in trapped spinor Bose-Einstein condensates with inhomogeneous spin-orbital-angular-momentum coupling

Year: 2025

Type: article

Abstract: We investigate the ground-state structures and vortex configurations in a two-component Bose-Einstein condensate under the influence of spin-orbital-angular-momentum coupling (SOAMC) with a high spatial inhomogeneity and high characteristic orbital angular momentum. By modulating the coupling strength, we uncover two distinct quantum phases: a stripe phase at low coupling strengths and a new vortex-necklace phase at higher coupling intensities. The latter is characterized by vortices forming a ring-shaped structure that acts as a domain wall, a unique phase boundary between a central stripe phase and an outer single-momentum phase. For a better understanding of this new mixed phase of the system, we develop an analytical model to describe the domain-wall radius as a function of coupling strength, which aligns well with numerical simulations. Our findings contribute to the understanding of SOAMC-driven quantum phase transitions and domain-wall formation, offering new insights into topological phenomena in ultracold atomic systems.

Source: Physical Review A

DOI: 10.1103/physreva.111.053303

Authors: O. O. Prykhodko, L. V. Zadorozhna

Institution: Taras Shevchenko National University of Kyiv

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,675

Funders: National Research Foundation of Ukraine, National Research Foundation, Taras Shevchenko National University of Kyiv, High Energy Physics