Nonequilibrium dynamics of optical-lattice-loaded Bose-Einstein-condensate atoms: Beyond the Hartree-Fock-Bogoliubov approximation
The nonequilibrium dynamics of a Bose-Einstein condensate selectively loaded into every third site of a one-dimensional optical lattice was discussed. A two-particle irreducible (2PI) closed-time-path (CTP) effective action was used for the purpose. Three different approximations under the 2PI CTP s...
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American Physical Society
2004
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| LEADER | 11599caa a22015617a 4500 | ||
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| 001 | PAPER-21333 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205246.0 | ||
| 008 | 190411s2004 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-2542438025 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a PLRAA | ||
| 100 | 1 | |a Rey, A.M. | |
| 245 | 1 | 0 | |a Nonequilibrium dynamics of optical-lattice-loaded Bose-Einstein-condensate atoms: Beyond the Hartree-Fock-Bogoliubov approximation |
| 260 | |b American Physical Society |c 2004 | ||
| 270 | 1 | 0 | |m Rey, A.M.; Department of Physics, University of Maryland, College Park, MD 20742, United States |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a note | ||
| 520 | 3 | |a The nonequilibrium dynamics of a Bose-Einstein condensate selectively loaded into every third site of a one-dimensional optical lattice was discussed. A two-particle irreducible (2PI) closed-time-path (CTP) effective action was used for the purpose. Three different approximations under the 2PI CTP scheme were considered. The comparisons between these approximations were presented and their range of validity by contrasting them with the exact many-body solution for a moderate number of atoms and wells was determined. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Agricultural Research Development Agency | ||
| 536 | |a Detalles de la financiación: National Institute of Standards and Technology | ||
| 536 | |a Detalles de la financiación: National Science Foundation | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: PLRAAN 1050-2947 10.1103/PhysRevA.56.1414 56 , 1414 ( 1997 ). The HFB approximation can be seen as a quadratic approximation of the Hamiltonian in which third and quadric terms are reduced to linear and quadratic forms by factorizing them in a self-consistent Gaussian approximation. Any quadratic Hamiltonian can be diagonalized exactly and this is achieved by transforming to a quassiparticle basic, { α ̂ q } . The requirement of the transformation to be cononical means that it preserves communication relation and leads to bosonic quassiparticles. A.M.R. acknowledges correspondence with Dr. Berges on his recent large N numerical results and discussions with Ted Kirkpatrick. A.M.R. and C.C. were supported in part by an Advanced Research and Development Activity contract and by the U.S. National Science Foundation under Grant No. PHY-0100767. B.L.H. and the visits of E.C. were supported in part by a NSF grant, a NIST grant, and an ARDA contract. E.C. was supported by the University of Buenos Aires, CONICET, Fundacion Antorchas, and ANPCyT under Project No. PICT 99 03-05229. A.R. was supported by NSF under Grant No. PHY-0300710. | ||
| 593 | |a Department of Physics, University of Maryland, College Park, MD 20742, United States | ||
| 593 | |a U. S. Department of Commerce, Natl. Inst. of Std. and Technology, Technology Administration, Gaithersburg, MD 20899-8410, United States | ||
| 593 | |a Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a APPROXIMATION THEORY |
| 690 | 1 | 0 | |a ATOMS |
| 690 | 1 | 0 | |a CORRELATION METHODS |
| 690 | 1 | 0 | |a EIGENVALUES AND EIGENFUNCTIONS |
| 690 | 1 | 0 | |a HAMILTONIANS |
| 690 | 1 | 0 | |a LIGHT SCATTERING |
| 690 | 1 | 0 | |a MATHEMATICAL OPERATORS |
| 690 | 1 | 0 | |a PARAMETER ESTIMATION |
| 690 | 1 | 0 | |a PERTURBATION TECHNIQUES |
| 690 | 1 | 0 | |a PROBLEM SOLVING |
| 690 | 1 | 0 | |a BOSE-EINSTEIN CONDENSATES |
| 690 | 1 | 0 | |a CLOSED-TIME-PATH (CTP) |
| 690 | 1 | 0 | |a OPTICAL LATTICES |
| 690 | 1 | 0 | |a TRAPPED ATOMS |
| 690 | 1 | 0 | |a QUANTUM THEORY |
| 700 | 1 | |a Hu, B.L. | |
| 700 | 1 | |a Calzetta, E. | |
| 700 | 1 | |a Roura, A. | |
| 700 | 1 | |a Clark, C.W. | |
| 773 | 0 | |d American Physical Society, 2004 |g v. 69 |h pp. 033610-1-033610-21 |k n. 3 |p Phys Rev A |x 10502947 |t Physical Review A - Atomic, Molecular, and Optical Physics | |
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