Fri, January 1, 2010

Probing quantum phase transitions at the single-atom level

Physicists Get an Up–Close Look at Synthetic Quantum Materials

Fri, January 1, 2010

Probing the Superfluid?to?Mott Insulator Transition at the Single-Atom Level

Fri, January 1, 2010

Rare-earth Atom Collisional Anisotropy

Fri, January 1, 2010

Thermometry and Refrigeration in a Two-Component Mott Insulator of Ultracold Atoms

In this work [1], we describe and analyze theoretically the two techniques of spin-gradient thermometry and spin gradient demagnetization cooling developed earlier by our group [2, 3].

Thu, January 1, 2009

Hybrid 2D surface trap for quantum simulation

J. I. Gillen, W. S. Bakr, A. Peng, P. Unterwaditzer, S. Foelling, M. Greiner, Hybrid 2D surface trap for quantum simulation, arXiv:0812.363v1 (2008)

Thu, January 1, 2009

Realization of high selectivity ion qubit addressing scheme

Selectively addressing individual qubits in an array of ions is a vital task for scalable quantum computation with trapped ions.  Traditionally, this is accomplished using complex optics for laser beam steering, but such schemes are not easily scalable.  We have realized a scalable alternative which employs the advantages of microfabrication and cryogenic operation, and applies...

Thu, January 1, 2009

Cold Trapped Molecules: Collisional Limitations and Mechanisms

Wesley Campbell, Timur Rscherbul, Hsin-I Lu, Edem Tsikata, Roman Krems, John Doyle, Physical Review Letters 102 013003 (2009)

Thu, January 1, 2009

Near Field Electrical Detection of Optical Plasmons and Single Plasmon Sources

A. Falk, F. L. Koppens, C. L. Yu, K. Kang, N. d. L. Snapp, A. V. Akimov, M. Jo, M. D. Lukin, and H. Park, Near Field Electrical Detection of Optical Plasmons and Single Plasmon Sources, Nature Physics 5, 475-479 doi:10.1038/nphys1284 (2009).

Thu, January 1, 2009

Observartion of itinerant ferromagnetism in a strongly interacting Fermi gas of ultracold atoms

Ferromagnetism of delocalized (itinerant) fermions occurs due to repulsive interactions and the exchange energy which reduces the interaction energy for spin polarized domains due to the Pauli exclusion principle.  At a critical interaction, given by the so-called Stoner criterion [1], they system spontaneously develops domains and becomes ferromagnetic.  This, together with a suitable band structure...

Thu, January 1, 2009

Buffer-gas Cooled Bose-Einstein Condensate

Now well into its second decade, the experimental realization of Bose-Einstein condensation (BEC) in dilute gases has led to revolutionary advances in physics. Since this achievement the field has moved quickly, with innumerable new developments in coherent atom and molecular optics and nonlinear atom optics, the observation of superfluidity in atomic gases, the study of novel quantum systems, and most recently the study of the BEC-BCS crossover. Despite the breadth of new research, however, the basic recipe for BEC is unchanged from its first realization in alkali atoms: pre-cool a hot sample utilizing laser cooling to permit trapping and provide high densities, followed by evaporative cooling to reach quantum degeneracy.