Observation of 2D Mott insulator and $π$ -superfluid quantum phase transition in shaking optical latticeObservation of 2D Mott insulator and $π$-superfluid quantum phase transition in shaking optical lattice

Jingxin Sun, Pengju Zhao, Zhongshu Hu +4 more

The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms. In this work, we report the observation of a novel 2D quantum phase transition between Mott insulator and $π$ superfluid in a shaking optical lattice. In the deep optical lattice regime, the lowest $s$ -band can be tuned to Mott phase, while the higher $p_{x,y}$ bands are itinerant for having larger bandwidth. Through a shaking technique coupling the $s$ orbital to $p_{x,y}$ orbital states, we experimentally observe the transition between the states of the $s$ and $p_{x,y}$ bands, leading to a quantum phase transition from 2D $s$ -orbital Mott phase to the $p_{x,y}$ -orbital superfluid which condensed at $(π,π)$ momentum.The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms. In this work, we report the observation of a novel 2D quantum phase transition between Mott insulator and $π$ superfluid in a shaking optical lattice. In the deep optical lattice regime, the lowest $s$-band can be tuned to Mott phase, while the higher $p_{x,y}$ bands are itinerant for having larger bandwidth. Through a shaking technique coupling the $s$ orbital to $p_{x,y}$ orbital states, we experimentally observe the transition between the states of the $s$ and $p_{x,y}$ bands, leading to a quantum phase transition from 2D $s$-orbital Mott phase to the $p_{x,y}$-orbital superfluid which condensed at $(π,π)$ momentum.

arXiv:2306.04477Jun 7, 20230 citations

Superfluid to Mott-insulator transition of cold atoms in optical lattices

N. Dupuis, K. Sengupta

arXiv:0811.2287Physica B Condensed MatterDec 3, 200810 citations

Energy Spectrum of Two-Component Bose–Einstein Condensates in Optical Lattices

Han Jiu-Rong, Liu Jin-Ming, Jing Hui +1 more

Abstract With the method of Green’s function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We find that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments.Abstract With the method of Green’s function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We find that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments.

Communications in Theoretical PhysicsMay 1, 20051 citation

Mott phases and superfluid-insulator transition of spin-3 bosonic atoms in an optical lattice

Jean-Sébastien Bernier, K. Sengupta, Yong Baek Kim

Bulletin of the American Physical SocietyMar 9, 20070 citations

Energy Spectrum of Two-Component Bose-Einstein Condensates in Optical Lattices

HANJiu-Rong, LIUJin-Ming, Jinghui +1 more

With the method of Green's function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We End that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments.With the method of Green's function, we investigate the energy spectra of two-component ultracold bosonic atoms in optical lattices. We End that there are two energy bands for each component. The critical condition of the superfluid-Mott insulator phase transition is determined by the energy band structure. We also find that the nearest neighboring and on-site interactions fail to change the structure of energy bands, but shift the energy bands only. According to the conditions of the phase transitions, three stable superfluid and Mott insulating phases can be found by adjusting the experiment parameters. We also discuss the possibility of observing these new phases and their transitions in further experiments.

理论物理通讯：英文版Jan 1, 20050 citations

Observation of 2D Mott insulator and

π

-superfluid quantum phase transition in shaking optical lattice

π

superfluid in a shaking optical lattice. In the deep optical lattice regime, the lowest

s

-band can be tuned to Mott phase, while the higher

p_{x,y}

bands are itinerant for having larger bandwidth. Through a shaking technique coupling the

s

orbital to

p_{x,y}

orbital states, we experimentally observe the transition between the states of the

s

and

p_{x,y}

bands, leading to a quantum phase transition from 2D

s

-orbital Mott phase to the

p_{x,y}

-orbital superfluid which condensed at

(π,π)

momentum.