Controllable optical multi-well trap and its optical lattices using compounded cosine patterns

Abstract

This paper proposes a flexible scheme to form various optical multi-well traps for cold atoms or molecules by using a simple optical system composed of an compounded amplitude cosine-only grating and a single lens illuminated by a plane light wave or a Gaussian beam. Dynamic manipulation and evolution of multi-well trap can be easily implemented by controlling the modulation frequency of the cosine patterns. It also discusses how to expand this multi-well trap to two-dimensional lattices with single-or multi-well trap by using an orthogonally or non-orthogonally modulated grating, as well as using incoherent multi-beam illumination, and these results show that all the symmetric structures of two-dimensional Bravais lattices can be obtained facilely by using proposed scheme.

Reduced one-body density matrix of Tonks–Girardeau gas at finite temperature

“…Based on two-body correlation, the Bose gas can be classified into various physical regimes. [15][16][17] In weak interaction regime, the Bose gas can be described approximated by mean field theory, [18] while in strong interaction regime we must turn to exact non-perturbation methods, such as Bethe ansatz [19][20][21][22][23] and exact diagonalization. [24][25][26] The ground state of Bose gas exhibits the Fermi-like density distribution, although the momentum distribution still behaves like Bose system.…”

Research on Techniques of Reducing the Life Cycle Carbon Emission at Building Design Stage

“…Most carbon emissions are from the city life, mainly from transport, industry and building, accounting for about 75% of global carbon emissions [1]. In the 2007 annual report by the United Nations Environment Program, it is point out that the energy consumption of building construction and maintenance accounts for 30% ~40% of the total global energy consumption [2]. Low carbon building has become the urgent requirement.…”

The dynamics of three coupled dipolar Bose—Einstein condensates

“…[28] In Ref. [29], the matterwave interference was studied in an axial triple-well optical dipole trap and the local field distribution functions of up-spins for systems of dipolar interaction with particular emphasis on Ising-type lattice systems was investigated systematically in Ref. [30].…”