Realization of Rb-87 Bose-Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice

Liu, Jin-Yu1,2; Wang, Xiao-Qiong3; Xu, Zhi-Fang2,3

2023-07-01

10.1088/0256-307X/40/8/086701

CHINESE PHYSICS LETTERS   影响因子和分区

0256-307X

1741-3540

Ultracold neutral atoms in higher bands of an optical lattice provide a natural avenue to emulate orbital physics in solid state materials. Here, we report the realization of Rb-87 Bose-Einstein condensates in the fourth and seventh Bloch bands of a hexagonal boron-nitride optical lattice, exhibiting remarkably long coherence time through active cooling. Using band mapping spectroscopy, we observe that atoms condensed at the energy minimum of & UGamma; point (K (1) and K (2) points) in the fourth (seventh) band as sharp Bragg peaks. The lifetime for the condensate in the fourth (seventh) band is about 57.6 (4.8) ms, and the phase coherence of atoms in the fourth band persists for a long time larger than 110 ms. Our work thus offers great promise for studying unconventional bosonic superfluidity of neutral atoms in higher bands of optical lattices.

SCI ; EI

英语

通讯

National Key Ramp;D Program of China["2022YFA1404103","2018YFA0307200"] ; Key-Area Research and Development Program of Guangdong Province[2019B030330001] ; National Natural Science Foundation of China[12274196] ; Funds from Guangdong Province["2019QN01X087","2019ZT08X324"]

Physics

Physics, Multidisciplinary

WOS:001036264500001

IOP Publishing Ltd

20233114472408

Atoms ; Boron nitride ; Bose-Einstein condensation ; Crystal lattices ; III-V semiconductors ; Nitrides ; Optical materials ; Statistical mechanics

Semiconducting Materials:712.1 ; Optical Devices and Systems:741.3 ; Laser Beam Interactions:744.8 ; Inorganic Compounds:804.2 ; Mathematical Statistics:922.2 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China

Liu, Jin-Yu,Wang, Xiao-Qiong,Xu, Zhi-Fang. Realization of Rb-87 Bose-Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice[J]. CHINESE PHYSICS LETTERS,2023,40(8).

Liu, Jin-Yu,Wang, Xiao-Qiong,&Xu, Zhi-Fang.(2023).Realization of Rb-87 Bose-Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice.CHINESE PHYSICS LETTERS,40(8).

Liu, Jin-Yu,et al."Realization of Rb-87 Bose-Einstein Condensates in Higher Bands of a Hexagonal Boron-Nitride Optical Lattice".CHINESE PHYSICS LETTERS 40.8(2023).