68,101 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
A measurable effect of general relativity in satellite orbits
Relativistic corrections calculated for one way Doppler system used in calculating orbital velocit
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
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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