Radio-frequency spectroscopy of weakly bound molecules in ultracold Fermi gas

Huang, Lianghui; Wang, Pengjun; Fu, Zhengkun; Zhang, Jing

doi:10.1088/1674-1056/23/1/013402

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…[9] The phase separation was studied by the mean-field theory due to the imbalanced mixture, paring symmetries, and antiferromagnetic order, [10] by the density-functional theory in a continuous system, [11] by the density-matrix renormalization group (DMRG) method [12] in a lattice system due to the component-dependent external potentials and the repulsive interactions, [13,14] and the polarizations. [15] We focus here on the optical lattice system of attractive interactions, [16][17][18] where the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase is one of the fascinating phenomena interested by both the experimentists [19] and theorists. [20,21,[23][24][25][26] In this paper, we study the interplay between the trapping potential imbalance and the attractive interactions in a twocomponent Fermi gas loaded in the one-dimensional (1D) optical lattices, [22,27] described by a Fermi-Hubbard model under the component-dependent external potentials.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

et al. 2015

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We investigate a one-dimensional two-component system in an optical lattice of attractive interactions under a spin-dependent external potential. Based on the density-matrix renormalization group methods, we obtain its phase diagram as a function of the external potential imbalance and the strength of the attractive interaction through the analysis on the density profiles and the momentum pair correlation functions. We find that there are three different phases in the system, a coexisted fully polarized and Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase, a normal polarized phase, and a Bardeen–Cooper–Schrieffer (BCS) phase. Different from the systems of spin-independent external potential, where the FFLO phase is normally favored by the attractive interactions, in the present situation, the FFLO phases are easily destroyed by the attractive interactions, leading to the normal polarized or the BCS phase.

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Section: Introductionmentioning

confidence: 99%

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

et al. 2015

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“…The alkali-metal binary atomic Bose-Fermi mixtures with 87 Rb and 40 K exhibit intriguing properties, which have rich Feshbach resonances, and have attracted enormous attention, [38,39] such as the Bose-Fermi Hubbard model, [40] few-body and mean-field many-body, [41] realization of mixed bright solitons, [42] and creation of polar molecules. [43] However, many problems still need to be overcome to achieve the degeneracy of Bose-Fermi gas mixtures in experiments, such as increasing the number and lifetime of the atomic mixtures via reducing the light-assisted hetero-nuclear collision losses, [44] avoiding the space competition induced by the over-lap high densities of the two atomic clouds during the stage for capturing atoms in three-dimensional magnetic-optical trap (3D MOT), and finding the right spin state to form atomic mixtures and to achieve better sympathetically evaporative cooling effect in the optical dipole trap (ODT).…”

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confidence: 99%

Optimal preparation of Bose and Fermi atomic gas mixtures of ⁸⁷Rb and ⁴⁰K in a crossed optical dipole trap

Ding 丁,

Shan 单,

Zhao 赵

et al. 2024

Chinese Phys. B

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We report on the optimal production of the Bose and Fermi mixtures with $^{87}$Rb and $^{40}$K in a crossed optical dipole trap (ODT). We measure the atomic number and lifetime of the mixtures at the combination of the spin state $|F=9/2, m_{F}=9/2\rangle$ of $^{40}$K and $|1, 1\rangle$ of $^{87}$Rb in the ODT, which is larger and longer compared with the combination of the spin state $|9/2, 9/2\rangle$ of $^{40}$K and $|2, 2\rangle$ of $^{87}$Rb in the ODT. We observe the atomic numbers of $^{87}$Rb and $^{40}$K shown in each stage of the sympathetic cooling process while gradually reducing the depth of the optical trap. By optimizing the relative loading time of atomic mixtures in the MOT, we can obtain the large atomic number of $^{40}$K ($\sim$6$\times$10$^{6}$) or the mixtures of atoms with an equal number ($\sim$1.6$\times$10$^{6}$) at the end of evaporative cooling in ODT. We have experimentally investigated the evaporative cooling in an enlarged volume of ODT via adding a third laser beam to the crossed ODT and found that more atoms (8$\times$10$^{6}$) and higher degeneracy ($T/T_F$=0.25) of Fermi gases are obtained. The ultracold atomic gas mixtures pave the way to explore phenomena such as few-body collisions and the Bose-Fermi Hubbard model, as well as for creating ground-state molecules of $^{87}$Rb$^{40}$K.

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Production of ⁸⁷Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method*

Fazal

Chen

et al. 2020

Chinese Phys. Lett.

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A Bose–Einstein condensate with a large atom number is an important experimental platform for quantum simulation and quantum information research. An optical dipole trap is the a conventional way to hold the ultracold atoms, where an atomic cloud is evaporatively cooled down before reaching the Bose–Einstein condensate. A carefully designed trap depth controlling curve is typically required to realize the optimal evaporation cooling. We present and demonstrate a simple way to optimize the evaporation cooling in a crossed optical dipole trap. A polyline shape optical power control profile is easily obtained with our method, by which a pure Bose–Einstein condensate with atom number 1.73 × 105 is produced. Theoretically, we numerically simulate the optimal evaporation cooling using the parameters of our apparatus based on a kinetic theory. Compared to the simulation results, our evaporation cooling shows a good performance. We believe that our simple method can be used to quickly realize evaporation cooling in optical dipole traps.

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Radio-frequency spectroscopy of weakly bound molecules in ultracold Fermi gas

Cited by 5 publications

References 27 publications

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

Optimal preparation of Bose and Fermi atomic gas mixtures of ⁸⁷Rb and ⁴⁰K in a crossed optical dipole trap

Production of ⁸⁷Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method*

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Radio-frequency spectroscopy of weakly bound molecules in ultracold Fermi gas

Cited by 5 publications

References 27 publications

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

Phase diagram of the Fermi–Hubbard model with spin-dependent external potentials: A DMRG study

Optimal preparation of Bose and Fermi atomic gas mixtures of 87Rb and 40K in a crossed optical dipole trap

Production of 87Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method*

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Product

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Optimal preparation of Bose and Fermi atomic gas mixtures of ⁸⁷Rb and ⁴⁰K in a crossed optical dipole trap

Production of ⁸⁷Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method*