68,545 research outputs found
Superpositions in Atomic Quantum Rings
Ultracold atoms are trapped circumferentially on a ring that is pierced at
its center by a flux tube arising from a light-induced gauge potential due to
applied Laguerre-Gaussian fields. We show that by using optical coherent state
superpositions to produce light-induced gauge potentials, we can create a
situation in which the trapped atoms are simultaneously exposed to two distinct
flux tubes, thereby creating superpositions in atomic quantum rings. We
consider the examples of both a ring geometry and harmonic trapping, and in
both cases the ground state of the quantum system is shown to be a
superposition of counter-rotating states of the atom trapped on the two
distinct flux tubes.Comment: 11 pages, 6 figure
Atomic-phase interference devices based on ring-shaped Bose-Einstein condensates: Two ring case
We theoretically investigate the ground-state properties and quantum dynamics
of a pair of adjacent ring-shaped Bose-Einstein condensates that are coupled
via tunneling. This device, which is the analogue of a symmetric
superconducting quantum interference device, is the simplest version of what we
term an Atomic-Phase Interference Device (APHID). The two-ring APHID is shown
to be sensitive to rotation.Comment: 8 page
A measurable effect of general relativity in satellite orbits
Relativistic corrections calculated for one way Doppler system used in calculating orbital velocit
Experimental Observation of Modulation Instability and Optical Spatial Soliton Arrays in Soft Condensed Matter
In this Letter we report observations of optically induced self-organization
of colloidal arrays in the presence of un-patterned counter-propagating
evanescent waves. The colloidal arrays formed along the laser propagation-axis
are shown to be linked to the break-up of the incident field into optical
spatial solitons, the lateral spacing of the arrays being related to modulation
instability of the soft condensed matter system.Comment: 16 pages, 3 figure
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