Ultracold quantum matter

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Time-averaged adiabatic ring potential for ultracold atoms

(2011)

Authors:

BE Sherlock, M Gildemeister, E Owen, E Nugent, CJ Foot

Time-averaged adiabatic ring potential for ultracold atoms (vol 83, 043408, 2011)

PHYSICAL REVIEW A 83:5 (2011) ARTN 059904

Authors:

BE Sherlock, M Gildemeister, E Owen, E Nugent, CJ Foot

Ultracold atoms in an optical lattice with dynamically variable periodicity

Physical Review A - Atomic, Molecular, and Optical Physics 82:2 (2010)

Authors:

S Al-Assam, RA Williams, CJ Foot

Abstract:

The use of a dynamic "accordion" lattice with ultracold atoms is demonstrated. Ultracold atoms of Rb87 are trapped in a two-dimensional optical lattice, and the spacing of the lattice is then increased in both directions from 2.2 to 5.5 渭m. Atoms remain bound for expansion times as short as a few milliseconds, and the experimentally measured minimum ramp time is found to agree well with numerical calculations. This technique allows an experiment such as quantum simulations to be performed with a lattice spacing smaller than the resolution limit of the imaging system, while allowing imaging of the atoms at individual lattice sites by subsequent expansion of the optical lattice. 漏 2010 The American Physical Society.

Ultracold atoms in an optical lattice with dynamically variable periodicity

(2010)

Authors:

S Al-Assam, RA Williams, CJ Foot

Trapping ultracold atoms in a time-averaged adiabatic potential

Physical Review A - Atomic, Molecular, and Optical Physics 81:3 (2010)

Authors:

M Gildemeister, E Nugent, BE Sherlock, M Kubasik, BT Sheard, CJ Foot

Abstract:

We report an experimental realization of ultracold atoms confined in a time-averaged, adiabatic potential (TAAP). This trapping technique involves using a slowly oscillating (鈭糼Hz) bias field to time-average the instantaneous potential given by dressing a bare magnetic potential with a high-frequency (~MHz) magnetic field. The resultant potentials provide a convenient route to a variety of trapping geometries with tunable parameters. We demonstrate the TAAP trap in a standard time-averaged orbiting potential trap with additional Helmholtz coils for the introduction of the radio frequency dressing field. We have evaporatively cooled 5脳104 atoms of Rb87 to quantum degeneracy and observed condensate lifetimes of longer than 3 s. 漏 2010 The American Physical Society.