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You searched on: Topic Area: Cold Atoms Sorted by: date

Displaying records 1 to 10 of 15 records.
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1. Bright focused ion beam sources based on laser-cooled atoms
Topic: Cold Atoms
Published: 3/24/2016
Authors: Jabez J McClelland, Adam V Steele, Brenton John Knuffman, Kevin A. Twedt, Andrew David Schwarzkopf, Truman M. Wilson
Abstract: Nanoscale focused ion beams (FIBs) represent one of the most useful tools in nanotechnology, enabling nanofabrication via milling and gas-assisted deposition, microscopy and microanalysis, and selective, spatially resolved doping of materials. R ...

2. Position-dependent spin-orbit coupling for ultracold atoms
Topic: Cold Atoms
Published: 2/18/2015
Authors: Ian B Spielman, Shih Wei Su, Shih-Chuan Gou, Ihe-Kau Liu, Luis Santos, Arturas Acus, Algirdas Mekys, Gediminas Juzeliunas
Abstract: We theoretically explore atomic Bose-Einstein condensates (BECs) subject to position-dependent spin-orbit coupling (SOC). This SOC can be produced by cyclically Raman coupling four internal atomic ground (or metastable) states in an environment wh ...

3. Optimally Focused Cold Atom Systems Obtained Using Density-Density Correlations
Topic: Cold Atoms
Published: 1/23/2014
Authors: Ian B Spielman, Andika Putra, Daniel Campbell, Ryan Price, Subhadeep De
Abstract: Resonant absorption imaging is a common technique for detecting the two-dimensional column density of ultracold atom systems. In many cases, the system‰s thickness along the imaging direction greatly exceeds the imaging system‰s depth of field, makin ...

4. Direct Observation of Zitterbewegung in a Bose-Einstein condensate
Topic: Cold Atoms
Published: 7/3/2013
Authors: Lindsay J. LeBlanc, Matthew Beeler, Karina Jimenez-Garcia, Abigail Reiko Perry, Seiji Sugawa, Ross Williams, Ian B Spielman
Abstract: Zitterbewegung, a force-free trembling motion first predicted for relativistic fermions like electrons, was an unexpected consequence of the Dirac equation's unification of quantum mechanics and special relativity. Though the oscillatory motion's lar ...

5. Dynamically Slowed Collapse of a Bose-Einstein Condensate with Negative Scattering Length
Topic: Cold Atoms
Published: 12/3/2012
Authors: Karina K. Jimenez Garcia, Robert L. Compton, Yu-Ju Lin, James V Porto, Ian B Spielman
Abstract: We rapidly change the scattering length a_s of a ^{87}Rb Bose-Einstein condensate by means of a Feshbach resonance, simultaneously releasing the condensate from its harmonic trapping potential. When a_s is changed from positive to negative, the subs ...

6. Observation of a superfluid Hall effect
Topic: Cold Atoms
Published: 7/3/2012
Authors: Lindsay J. LeBlanc, Karina K. Jimenez Garcia, Ross A. Williams, Matthew C. Beeler, Abigail Reiko Perry, William D Phillips, Ian B Spielman
Abstract: Measurement techniques based upon the Hall effect are essential tools in condensed matter physics. Here, we report the first observation of a Hall effect in an ultracold gas of neutral atoms, revealed by measuring Bose-Einstein condensate's transpo ...

7. The Peierls Substitution in an Engineered Lattice Potential
Topic: Cold Atoms
Published: 5/29/2012
Authors: Karina K. Jimenez Garcia, Lindsay J. LeBlanc, Ross A. Williams, Matthew C. Beeler, Abigail Reiko Perry, Ian B Spielman
Abstract: Artificial gauge fields open new possibilities to realize quantum many-body systems with ultracold atoms, by constructing Hamiltonians usually associated with electronic systems. In the presence of a periodic potential, artificial gauge fields may br ...

8. Beyond s-wave scattering for ultracold atoms
Topic: Cold Atoms
Published: 1/20/2012
Authors: Ross A. Williams, Lindsay J. LeBlanc, Karina K. Jimenez Garcia, Matthew C. Beeler, Abigail Reiko Perry, William D Phillips, Ian B Spielman
Abstract: Interactions between particles can be strongly altered by their environment. Here we demonstrate a technique for modifying interactions between ultracold atoms by dressing the bare atomic states with light, creating a screened interaction of vastly i ...

9. Chern Numbers Hiding in Time-of-Flight Images
Topic: Cold Atoms
Published: 12/21/2011
Authors: Ian B Spielman, Erhai Zhao, Noah Bray-Ali, Carl J Williams, Indubala Satija
Abstract: We present a novel technique for detecting topological invariants -- Chern numbers -- from time-of-flight images of ultra-cold neutral atoms. The Chern number of fermions in a lattice potential depends on magnetic field (for neutral atoms, generated ...

10. Differential Light Shift Cancellation in a B-Field Insensitive Transition of 87Rb
Topic: Cold Atoms
Published: 2/11/2011
Authors: Radu S. Chicireanu, Karl D. Nelson, Steven M Olmschenk, Nathan Lundblad, A. Derevianko, James V Porto
Abstract: We demonstrate substantial cancellation of the differential light shift of a magnetic-field-insensitive microwave hyperfine (clock) transition in 87Rb atoms trapped in an optical lattice. Up to 95.5% of the differential light shift is cancelled while ...

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