Thermal effects on density-modulated phases in a dipolar Bose--Einstein condensate

Changjian Yu; Jinbin Li; Kui-Tian Xi

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arXiv · 2510.24419

Thermal effects on density-modulated phases in a dipolar Bose--Einstein condensate

Changjian Yu·Jinbin Li·Kui-Tian Xi

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Abstract

Density-modulated phases in dipolar Bose--Einstein condensates arise from the competition between contact repulsion, long-range dipole--dipole interactions, and beyond-mean-field fluctuations. We examine finite-temperature stationary states of a harmonically trapped dipolar Bose gas using a temperature-dependent extended Gross--Pitaevskii equation within the local-density approximation. In this framework, the thermal correction shifts some structural boundaries toward larger scattering lengths and changes the parameter region in which connected density-modulated states are obtained. The density contrast changes sharply at $T = 0$, whereas at finite temperature it varies more gradually, consistent with a smooth crossover-like evolution in the finite trapped system. We also use Leggett's bound to estimate a geometric upper limit on the possible superfluid response for representative density profiles. These results suggest that finite-temperature corrections can reshape pattern formation in dipolar quantum gases.

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Changjian Yu, Jinbin Li, Kui-Tian Xi. 2025-10-28. Thermal effects on density-modulated phases in a dipolar Bose--Einstein condensate. https://arxiv.org/abs/2510.24419

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