Effective theory for ultracold strongly interacting fermionic atoms in two dimensions
Effective theory for ultracold strongly interacting fermionic atoms in two dimensions
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二维超冷强相互作用费米子原子的有效理论
DOI:
10.1103/physreva.101.043607
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发表时间:
2019-06
影响因子:
2.9
通讯作者:
Hui Hu
中科院分区:
文献类型:
--
作者:
Fan Wu;Jianshen Hu;Lianyi He;Xia-Ji Liu;Hui Hu
We propose a minimal theoretical model for the description of a two-dimensional (2D) strongly interacting Fermi gas confined transversely in a tight harmonic potential, and present accurate predictions for its equation of state and breathing mode frequency. We show that the minimal model Hamiltonian needs at least two independent interaction parameters, the 2D scattering length and effective range of interactions, in order to quantitatively explain recent experimental measurements at nonzero filling factor $N/N_{2D}$, where $N$ is the total number of atoms and $N_{2D}$ is the threshold number to reach the 2D limit. We therefore resolve in a satisfactory way the puzzling experimental observations of reduced equations of state and reduced quantum anomaly in breathing mode frequency, due to small yet non-negligible $N/N_{2D}$. We argue that a conclusive demonstration of the much-anticipated quantum anomaly is possible at a filling factor of a few percent. Our establishment of the minimal model for 2D ultracold atoms could be crucial to understanding the fermionic Berezinskii-Kosterlitz-Thouless transition in the strongly correlated regime.
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DOI:
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发表时间:
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期刊:
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影响因子:
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影响因子:
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影响因子:
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通讯作者:
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DOI:
--
发表时间:
2013
期刊:
--
影响因子:
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