Three-Body Recombination near a Narrow Feshbach Resonance in 6 Li

We experimentally measure and theoretically analyze the three-atom recombination rate, L3, around a narrow s-wave magnetic Feshbach resonance of 6Li−6Li at 543.3 G. By examining both the magnetic field dependence and, especially, the temperature dependence of L3 over a wide range of temperatures from a few μK to above 200 μK, we show that three-atom recombination through a narrow resonance follows a universal behavior determined by the long-range van der Waals potential and can be described by a set of rate equations in which three-body recombination proceeds via successive pairwise interactions. We expect the underlying physical picture to be applicable not only to narrow s wave resonances, but also to resonances in nonzero partial waves, and not only at ultracold temperatures, but also at much higher temperatures

Quantum discord amplification induced by quantum phase transition via a cavity-Bose-Einstein-condensate system

We propose a theoretical scheme to realize a sensitive amplification of quantum discord (QD) between two atomic qubits via a cavity-Bose-Einstein condensate (BEC) system which was used to firstly realize the Dicke quantum phase transition (QPT) [Nature 464, 1301 (2010)]. It is shown that the influence of the cavity-BEC system upon the two qubits is equivalent to a phase decoherence environment. It is found that QPT in the cavity-BEC system is the physical mechanism of the sensitive QD amplification.Comment: 5 pages, 3 figure

Parametric cooling of a degenerate Fermi gas in an optical trap

We demonstrate a novel technique for cooling a degenerate Fermi gas in a crossed-beam optical dipole trap, where high-energy atoms can be selectively removed from the trap by modulating the stiffness of the trapping potential with anharmonic trapping frequencies. We measure the dependence of the cooling effect on the frequency and amplitude of the parametric modulations. It is found that the large anharmonicity along the axial trapping potential allows to generate a degenerate Fermi gas with anisotropic energy distribution, in which the cloud energy in the axial direction can be reduced to the ground state value

Colonial Rule and Industrialization in Esan, Benin Province, Nigeria: A Case Study of Institutional Adaptation

This paper examines the operation of British economic policy in Esan specifically as it relates to industrialization. Before the emergence of the British colonizers, the people of Esan were engaged in cottage industries which included cloth weaving (textile), basket and rope weaving, wood carving (art and craft), blacksmithing, pottery, soap and palm oil processing, palm wine tapping and food processing. The paper argues that a traditional industrial structure and practice in Esan had attained a level of sophistication prior to the emergence of British who sought to impose new demands on society. The people as well as their institutions were not receptive to the new demands. Rather, there was a conscious effort to meet colonial expectations while at the same time formulating strategies that would accommodate the traditional practices. There was thus a continuous process of adjustments and search for relevance in the new economy that was imposed on the people of Esan by the British Colonial authorities.Key words: Cottage Industries, Colonial rule, Institutional Adaptatio