Phase and micromotion of Bose-Einstein condensates in a time-averaged ring trap
arXiv:1802.05488 · doi:10.1103/PhysRevA.98.013604
Abstract
Rapidly scanning magnetic and optical dipole traps have been widely utilised to form time-averaged potentials for ultracold quantum gas experiments. Here we theoretically and experimentally characterise the dynamic properties of Bose-Einstein condensates in ring-shaped potentials that are formed by scanning an optical dipole beam in a circular trajectory. We find that unidirectional scanning leads to a non-trivial phase profile of the condensate that can be approximated analytically using the concept of phase imprinting. While the phase profile is not accessible through in-trap imaging, time-of-flight expansion manifests clear density signatures of an in-trap phase step in the condensate, coincident with the instantaneous position of the scanning beam. The phase step remains significant even when scanning the beam at frequencies two orders of magnitude larger than the characteristic frequency of the trap. We map out the phase and density properties of the condensate in the scanning trap, both experimentally and using numerical simulations, and find excellent agreement. Furthermore, we demonstrate that bidirectional scanning eliminated the phase gradient, rendering the system more suitable for coherent matter wave interferometry.
arXiv comment10 pages, 7 figures
References in corpus (25)
- Matter-wave interferometry in a double well on an atom chip
- Experimental demonstration of painting arbitrary and dynamic potentials for Bose-Einstein condensates
- Experimental realization of Josephson junctions for an Atom SQUID
- XMDS2: Fast, scalable simulation of coupled stochastic partial differential equations
- Direct imaging of a digital-micromirror device for configurable microscopic optical potentials
- Rapid production of Rb BECs in a combined magnetic and optical potential
- A ring trap for ultracold atoms
- Dynamic Manipulation of Bose-Einstein Condensates With a Spatial Light Modulator
- Ultracold atoms confined in rf-induced two-dimensional trapping potentials
- Bose-Einstein condensation in large time-averaged optical ring potentials
- High-resolution imaging of ultracold fermions in microscopically tailored optical potentials
- Versatile two-dimensional potentials for ultra-cold atoms
- Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation
- Control and Manipulation of Cold Atoms in Optical Tweezers
- Integrated coherent matter wave circuits
- Precise shaping of laser light by an acousto-optic deflector
- Producing superfluid circulation states using phase imprinting
- Steerable optical tweezers for ultracold atom studies
- Atomic micromotion and geometric forces in a triaxial magnetic trap
- Spin-orbit coupled interferometry with ring-trapped Bose--Einstein condensates
- Bose-Einstein condensation of rubidium atoms in a triaxial TOP-trap
- Phase fluctuations in anisotropic Bose condensates: from cigars to rings
- Optical runaway evaporation for multi-BEC production
- A versatile apparatus for two-dimensional atomtronic quantum simulation
- Solitary-wave description of condensate micro-motion in a time-averaged orbiting potential trap
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- Floquet analysis of time-averaged trapping potentials
- Exotic Quantum States in Spin-1 Bose-Einstein Condensate with Spin-Orbit Coupling in Concentric Annular Traps