Investigation of Feshbach resonances in ultracold 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="bold">K</mml:mi><mml:mprescripts /><mml:none /><mml:mn>40</mml:mn></mml:mmultiscripts></mml:math>
 spin mixtures

Krauser, J.; Heinze, Jannes; Götze, Sören; Langbecker, Maria; Fläschner, Nick; Cook, L.G.; Hanna, Thomas M.; Tiesinga, Eite; Sengstock, K.; Becker, Christoph

doi:10.1103/physreva.95.042701

Cited by 10 publications

(8 citation statements)

References 51 publications

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“…The magnetic field (or in alternative the light shift) inducing the Feshbach resonance has to be then tuned spatially on the lattice spacing scale such to provide the desired V -shape interaction profile. In alternative, at the price of doubling the number of Dirac points, we can consider two spin states of fermionic atoms with Feshbach resonance like potassium [126] loaded in a spin-independent π-flux square lattice and perceiving the same laser-induced tunneling term. The interactions are now on site.…”

Section: Experimental Realization and Detection Of Unruh Effectmentioning

confidence: 99%

Unruh effect for interacting particles with ultracold atoms

2018

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Section: Experimental Realization and Detection Of Unruh Effectmentioning

confidence: 99%

Unruh effect for interacting particles with ultracold atoms

2018

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“…To demonstrate the feasibility of our protocol, we prepare the two-state spin-mixture in both the strongly and weakly interacting regimes. [29,30] We apply a variable number N p of resonant RF π-pulses (square shaped in time domain) during each measurement cycle prior to the time of flight imaging (TOF). We define the total measurement cycle duration T t as (T π + T f ) × N p , where T f is the separation between the neighboring π-pulses, as depicted in Fig.…”

Section: Results and Analysismentioning

confidence: 99%

Preparation of a two-state mixture of ultracold fermionic atoms with balanced population subject to the unstable magnetic field*

Li¹,

Huang²,

Bian³

et al. 2021

Chinese Phys. B

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We report a novel method to prepare a mixture of 40K Fermi gas having an equal population of the two ground magnetic spin states confined in an optical dipole trap, in the presence of an noisy quantization (magnetic) field. We realize the equal population mixture by applying a series of RF pulses. We observe the dependence of the population distribution between two spin states on the number of the applied RF pulses and find that the decoherence effects leading to the population fluctuations are overcome by the high number of RF pules. Our demonstrated technique can be potentially used in the precision measurement experiments with ultracold gases in noisy environments.

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“…Large-spin ( f > 1 2 ) [1][2][3][4] and multi-component [5][6][7][8][9] cold Fermi atoms provide a good simulation platform for studying many-body physics. The former system usually satisfies the SP(N) or SU(N) symmetries, while the latter can be mapped into more general pseudo-spin models with lower symmetries by precisely controlling interaction parameters, atomic species, and particle numbers.…”

Section: Introductionmentioning

confidence: 99%

Collective excitations of a general spin-3/2 Fermi gas

Xu¹,

Guo²,

Gu³

2022

J. Phys. B: At. Mol. Opt. Phys.

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Collective excitation modes in a general spin-3/2 Fermi gas with spin-dependent contact interactions are investigated by two-particle Green's functions and diagram techniques. Energy spectra for two branches of charge-density waves and three branches of transverse spin-density waves are obtained within the random-phase approximation. All spectra are gapless and linear in the small wave vector $q$, with their slopes dependant on the interaction parameters. It is also found that the spin-mixing interaction has effects on the transverse spin-density waves, but not on the charge-density modes. When the system satisfies SU(4) symmetry, the two charge-density modes become degenerate and two of the three transverse spin-density modes are degenerate, too. Furthermore, static spin susceptibilities are discussed in detail. It is found that susceptibilities are increasing with the enhancement of all interaction parameters, and become divergent at certain points. This phenomenon is analogous to the Stoner transition in spin-1/2 fermion gas.

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Investigation of Feshbach resonances in ultracold K40 spin mixtures

Cited by 10 publications

References 51 publications

Unruh effect for interacting particles with ultracold atoms

Unruh effect for interacting particles with ultracold atoms

Preparation of a two-state mixture of ultracold fermionic atoms with balanced population subject to the unstable magnetic field*

Collective excitations of a general spin-3/2 Fermi gas

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