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Solitary Excitations of Dipolar Bosons in Optical Lattice under Magnetic Fields
Authors:WANG Shi-En YANG Dao-Sheng
Institution:Department of Physics, Honghe University, Mengzi 661100, China; Department of Materials, Tsinghua University, Beijing 100084, China Department of Physics, Wenshang Normal Academy, Wenshang 663000, China;Department of Physics, Beijing Normal University, Beijing 100875, China
Abstract:We obtain the multisolitary solutions of the extended Bose-Hubbard model which describes dipolar BoseEinstein condensates in optical lattices under time-dependent magnetic fields, and indicate that the nonlinearity is due to both on-site short-range interactions and also (long-range) dipole-dipole interactions which can act between neighboring sites. The discrete breathers as nonlinear excitations are always oscillatory in time and can also be spatially localized,while the oscillatory frequencies are determined by an external field. We show that these excitations will be observable and discuss how the parameters can be tuned in future experiments.
Keywords:solitary excitation  extended Bose-Hubbard model  bosons  optical lattice
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