A cost-effective high-flux source of cold ytterbium atoms

Song, Bo; Zou, Yueyang; Zhang, Shanchao; Cho, Chang-woo

doi:10.1007/s00340-016-6523-8

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…A degenerate equal mixture of N ↑,↓ = 5 × 10 3 173 Yb atoms at T / T F = 0.4 was prepared after forced-evaporative cooling in an ODT ( 28 , 47 ), where T F is the Fermi temperature of the trapped fermions with a trapping frequency of

. A quantized axis was fixed by the bias magnetic field of 5 G applied along the

direction.…”

Section: Methodsmentioning

confidence: 99%

Observation of symmetry-protected topological band with ultracold fermions

et al. 2018

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. A quantized axis was fixed by the bias magnetic field of 5 G applied along the

direction.…”

Section: Methodsmentioning

confidence: 99%

Observation of symmetry-protected topological band with ultracold fermions

et al. 2018

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“…The experiment begins with a laser cooled Fermi gas of 173 Yb loaded into a crossed optical dipole trap (ODT) [23]. The crossed ODT is formed with a 1064 nm laser beam along one axis and counter-propagating 532 nm beams with two separately controllable polarizations along the other axis.…”

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confidence: 99%

Collective excitations in two-dimensional SU( N ) Fermi gases with tunable spin

Ren

Song

et al. 2020

Phys. Rev. Research

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We measure collective excitations of a harmonically trapped two-dimensional (2D) SU(N ) Fermi gas of 173 Yb confined to a stack of layers formed by a one-dimensional optical lattice. Quadrupole and breathing modes are excited and monitored in the collisionless regime |ln(kF a2D)| 1 with tunable spin. We observe that the quadrupole mode frequency decreases with increasing number of spin component N due to the amplification of the interaction effect by N in agreement with theoretical prediction based on 2D kinetic equations. The breathing mode frequency, however, is twice the dipole oscillation frequency. We also follow the evolution of collective excitations in the dimensional crossover from two to three dimensions and characterize the damping rate of quadrupole and breathing modes for tunable SU(N ) fermions, both of which reveal the enhanced inter-particle collisions for large spin. Our result paves the way to investigate the collective property of 2D SU(N ) Fermi liquid with high spin. * Electronic address: gbjo@ust.hk * Electronic address: gbjo@ust.hk[1] D. Guéry-Odelin, Phys. Rev. A 66 033613 (2002).

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“…We begin experiments with a degenerate Fermi gas of 173 Yb atoms by loading cold atoms pre-cooled in the intercombination magneto-optical trap into a crossed optical dipole trap (ODT). The crossed ODT, generated by 1064 nm lights, consists of a tight ODT (tODT) in the horizontal plane and a shallow ODT (sODT), the latter of which is tilted by 15 degree from the horizontal plane 15,28 . In the middle of the forced evaporative cooling, we optically pump more than 70% atoms into the state of the 1 S 0 ground state by applying a weak nearly resonant 556 nm light with σ + polarization.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Collective dipole oscillations of a spin-orbit coupled Fermi gas

Zhang

Hajiyev

et al. 2018

Sci Rep

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The collective dipole mode is induced and measured in a spin-orbit (SO) coupled degenerate Fermi gas of 173Yb atoms. Using a differential optical Stark shift, we split the degeneracy of three hyperfine states in the ground manifold, and independently couple consecutive spin states with the equal Raman transitions. A relatively long-lived spin-orbit-coupled Fermi gas, readily being realized with a narrow optical transition, allows to explore a single-minimum dispersion where three minima of spin-1 system merge into and to monitor collective dipole modes of fermions in the strong coupling regime. The measured oscillation frequency of the dipole mode is compared with the semi-classical calculation in the single-particle regime. Our work should pave the way towards the characterization of spin-orbit-coupled fermions with large spin s > in the strong coupling regime.

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A cost-effective high-flux source of cold ytterbium atoms

Cited by 11 publications

References 34 publications

Observation of symmetry-protected topological band with ultracold fermions

Observation of symmetry-protected topological band with ultracold fermions

Collective excitations in two-dimensional SU( N ) Fermi gases with tunable spin

Collective dipole oscillations of a spin-orbit coupled Fermi gas

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