Dynamic Evolution Of Ultracold Atoms In The D Band Of Triangular Optical Lattice

Ultracold atoms in optical lattice have good coherence and play an important role in the study of cold atomic physics.Various quantum phase transitions in solid state physics can be simulated by loading ultracold atoms into optical lattices.In recent years,the study of ultracold atoms in the high excited energy band of optical lattice has attracted extensive attention and many interesting multi-body physical phenomena have been discovered.For example,the supersolid quantum phase of the ultracold atom in the cubic lattice in the high-excited energy band,the quantum band orbital in the triangular lattice and so on.Multi-component ultracold atoms can realize multi-spin systems and are widely used in spin-independent optical lattices and non-spin-independent optical lattices.They can be used to simulate the ferromagnetic and anti-ferromagnetic states in solid materials and study the quantum phase and dynamics of spin mixtures.The quantum effect of gravity can also be studied by using a spin entangled interferometer.The main work of this paper is as follows:1.The preparation of multicomponent ultra-cold atoms is realized.In the experiment,by the method of non-adiabatic Majorana transition,BEC was prepared to different magneton levels,and the proportion of different components could be precisely controlled,so that a multi-spin condensate was realized,which provided a technical basis for further realization of quantum bits in the optical lattice.2.Realize the rapid loading of ultracold atoms on the D band in the triangular optical lattice.We use a new method of rapid loading,which reduces the loading time of ultra-cold atoms from a few tens of milliseconds of adiabatic loading to less than 100 microseconds,at least two orders of magnitude,while maintaining extremely high loading efficiency.This fast and efficient method of loading atoms into highly excited energy bands paves the way for novel quantum states such as supersolids.3.The lifetime of ultracold atoms at different well depths in the D band of triangular optical lattice is investigated.The lifetime of atoms in the D band of triangular optical lattice can reach more than ten milliseconds,which is an order of magnitude longer than that in the D band of one-dimensional optical lattice.We can study atoms in optical lattice dynamics of evolution in the longer time scale,and it can realize more complex quantum manipulation of the simulation of highly excited the bizarre quantum phase.The relationship between the well depth of optical lattice and the lifetime of atoms is also investigated.In this paper,a rapid method for high excited energy band loading of two-dimensional optical lattice is presented.The experimental results have important reference significance for the study of high-excited energy bands of triangular optical lattice and other two-dimensional optical lattice.