Competing bosonic condensates in optical lattice with a mixture of single and pair hoppings

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• 作者：V.M. Travin ^{v.travin@int.pan.wroc.pl} ; T.K. Kopeć ; ^{t.kopec@int.pan.wroc.pl}
• 关键词：Optical lattice ; Condensation ; Pair hopping ; Competing orders
• 刊名：Physica B: Condensed Matter
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：505
• 期：Complete
• 页码：22-32
• 全文大小：1242 K
• 卷排序：505

文摘

A system of ultra-cold atoms with single boson and pair tunneling of bosonic atoms is considered in an optical lattice at arbitrary temperature. A mean-field theory was applied to the extended Bose-Hubbard Hamiltonian describing the system in order to investigate the competition between superfluid and pair superfluid as a function of the chemical potential and the temperature. To this end we have applied a method based on the Laplace transform method for the efficient calculation of the statistical sum for the quantum Hamiltonian. These results may be of interest for experiments on cold atom systems in optical lattices.