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quantum phases of Bose gases on a lattice with pair-tunneling

Chinese Physics B 2012年第6期21卷 48-56页

作者：王月明梁九卿 Department of Physics Institute of Theoretical PhysicsShanxi University

We investigate the strongly interacting lattice Bose gases on a lattice with two-body interaction of nearest neighbors characterized by pair tunneling. The excitation spectrum and the depletion of the condensate of lattice Bose gases are investigated using the Bogoliubov transformation method and the results show that there is a pair condensate as well as a single particle condensate. The various possible quantum phases, such as the Mott-insulator phase （MI）, the superfluid phase （SF） of an individual atom, the charge density wave phase （CDW）, the supersolid phase （SS）, the pair-superfluid （PSF） phase, and the pair-supersolid phase （PSS） are discussed in different parametric regions within our extended Bose-Hubbard model using perturbation theory.

关键词： Bose-Einstein condensate quantum phase optical lattice superfluidity

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quantum phases of Cold Bosonic Atoms in an Optical Lattice with Inhomogeneous Atomic Interactions and Coexistence of Multi phases

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Communications in Theoretical Physics 2017年第4期67卷 421-424页

作者：李艳英侯净敏 Department of Physics Southeast UniversityNanjing 211189China

We study cold bosonic atoms on a two-dimensional inhomogeneous optical lattice with site-dependent atomic interactions. With the tight-binding approximation, we derive the extended Bose–Hubbard model. Base on the mean-field approximation, the ground states are solved by the exact diagonalization method. We calculate the mean-field order parameter and particle number density for the ground states. We find the coexistence of superfluid phase and Mott-insulator phase on the two-dimensional inhomogeneous optical lattice in appropriate parameter ranges.

关键词： optical lattice quantum phase Bose–Hubbard model

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Efect of atmospheric turbulence on the orbital angular momentum of hollow vortex beams

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Science China(Information Sciences) 2013年第12期 186-194页

作者： KE XiZheng CHEN Juan LV Hong The Faculty of Automation & Information Engineering Xi’an University of Technology

The phase fluctuation of Laguerre-Gaussian(LG)vortex beams induced by atmospheric turbulence afects the quantum phase associated with azimuth coordinates and afects the orbital angular momentum of the vortex *** measurement of orbital angular momentum is afected by the change in the classical phase and the quantum phase in the Hilbert *** paper analyzes the additional random complex phase of the vortex beam generated by the atmospheric turbulence and discusses the efect of atmospheric turbulence on the orbital angular momentum of an LG vortex beam using the photon state-vector *** distributions of the classical phase of vortex beams afected by turbulence of diferent strengths are calculated and compared with the case for LG vortex beams transmitted through free *** show that the atmospheric turbulence afects the phase value of LG vortex beams transmitted in the external feld and signifcantly afects the beam phase structure in the near ***,the efect of turbulence on the phase of vortex beams is insignifcant for a transmission range z>2000 m while the phase values vary slowly and gradually become constant.

关键词： turbulence efect vortex beam orbital angular momentum phase fluctuation quantum phase

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