Open AccessDensity fluctuations and sub-Poisson distribution in the ultracold Fermi gas of <sup>6</sup>Li
Author(s) -
王娟,
张笑天,
武泽茂,
邓书金,
武海斌
Publication year - 2020
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.69.20200603
Subject(s) - physics , fermi gas , fermi–dirac statistics , pauli exclusion principle , fermion , noise (video) , quantum noise , condensed matter physics , fermi gamma ray space telescope , atomic physics , quantum oscillations , quantum mechanics , quantum , electron , artificial intelligence , computer science , image (mathematics)
In this paper, we study the spatial noise fluctuations of the density distribution of non-interacting 6 Li ultracold Fermi gases. For ideal ultracold Fermi gases, the Fermi-Dirac statistics governs its quantum distribution. The suppression of density fluctuations at low temperature, due to Pauli exclusion principle, is observed in a large cloud of fermions. To clearly reveal the density noise fluctuations of the ideal Fermi gases, other noises, such as the background noise, imaging laser noise, CCD photon counting noise, are greatly suppressed. The noise fluctuation shows a sub-Poissonian statistics in excess of 10,000 atoms per spin state. The dependence of the spatial atom noise fluctuation on the quantum degeneracy is also investigated by changing the temperature of the degenerated Fermi gases. The Fermi gases with lower temperature exhibit larger suppression of the noise fluctuations. The results may have great applications in measuring the temperature of strongly correlated many-body physics and observing the phase transition of incompressible quantum phases.