Critical Trap Aspect Ratios For Dipolar BEC

TL;DR

This paper identifies critical trap aspect ratios in dipolar Bose-Einstein condensates that influence vortex stability, precession, and can be manipulated by anharmonic potentials, revealing key factors for controlling dipolar BEC behavior.

Contribution

It introduces the concept of critical trap aspect ratios affecting vortex dynamics and stability in dipolar BECs, highlighting their dependence on trap geometry and anharmonic potentials.

Findings

Existence of critical trap aspect ratios for dipolar BEC stability.

Critical aspect ratios influence vortex energetics and precession.

Stability diagrams depend crucially on these aspect ratios.

Abstract

We show that there exists critical trap aspect ratios for a trapped Bose-Einstein condensate with dipole-dipole interactions. We discuss the role of critical trap aspect ratios on both the critical angular velocity above which a vortex is energetically favorable and the precession velocity of an off-axis vortex in TF regime. We show that the stability diagram for a purely dipolar gas depends crucially on the critical trap aspect ratios both for positive and negative strength of dipolar interaction. We prove that the critical points can be changed by an anharmonic potential.