Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials

Nagler, Benjamin; Jägering, Kevin; Sheikhan, Ameneh; Barbosa, Sian; Koch, Jennifer; Eggert, Sebastian; Schneider, I.; Widera, Artur

doi:10.1103/physreva.101.053633

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…Finally, our approach can be adapted to investigate the transport properties of other kinds of two-particle systems subject to quenched randomness, like Cooper pairs in strongly disordered atomic gases [81] or superconductors [82][83][84]. Investigations of the steady-state and out-of-equilibrium properties of a Fermi gas undergoing the BCS-BEC crossover in the presence of a random potential [85] are already under way [86][87][88][89].…”

Section: Discussionmentioning

confidence: 99%

Two-body mobility edge in the Anderson-Hubbard model in three dimensions: Molecular versus scattering states

Stellin

Orso

2020

Phys. Rev. Research

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Most of our quantitative understanding of disorder-induced metal-insulator transitions comes from numerical studies of simple noninteracting tight-binding models, like the Anderson model in three dimensions. An important outstanding problem is the fate of the Anderson transition in the presence of additional Hubbard interactions of strength U between particles. Based on large-scale numerics, we compute the position of the mobility edge for a system of two identical bosons or two fermions with opposite spin components. The resulting phase diagram in the interaction-energy-disorder space possesses a remarkably rich and counterintuitive structure, with multiple metallic and insulating phases. We show that this phenomenon originates from the molecular or scatteringlike nature of the pair states available at given energy E and disorder strength W. The disorder-averaged density of states of the effective model for the pair is also investigated. Finally, we discuss the implications of our results for ongoing research on many-body localization.

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Section: Discussionmentioning

confidence: 99%

Two-body mobility edge in the Anderson-Hubbard model in three dimensions: Molecular versus scattering states

Stellin

Orso

2020

Phys. Rev. Research

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“…In order to study the influence of the optical speckle potential on a quantum gas, we apply the speckle pattern and adjust it to the position of the molecular BEC as described above; for details, see [55]. Focused onto the molecular cloud in the center of a vacuum system, the speckle pattern cannot be characterized directly but only via its impact onto the ultracold cloud via the dipole force.…”

Section: In-situ Measurement Of the Correlation Anglementioning

confidence: 99%

Characterizing quantum gases in time-controlled disorder realizations using cross-correlations of density distributions

Hiebel,

Nagler,

Barbosa

et al. 2024

New J. Phys.

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The role of disorder on physical systems has been widely studied in the macroscopic and microscopic world. While static disorder is well understood in many cases, the impact of time-dependent disorder on quantum gases is still poorly investigated. In our experimental setup, we introduce and characterize a method capable of producing time-controlled optical-speckle disorder. Experimentally, coherent light illuminates a combination of a static and a rotating diffuser, thereby collecting a spatially varying phase due to the diffusers’ structure and a temporally variable phase due to the relative rotation. Controlling the rotation of the diffuser allows changing the speckle realization or, for future work, the characteristic time scale of the change of the speckle pattern, i.e., the correlation time, matching typical time scales of the quantum gases investigated. We characterize the speckle pattern ex-situ by measuring its intensity distribution cross-correlating different intensity patterns. In- situ, we observe its impact on a molecular Bose-Einstein condensate (BEC) and cross- correlate the density distributions of BECs probed in different speckle realizations. As one diffuser rotates relative to the other around the common optical axis, we trace the optical speckle’s intensity cross-correlations and the quantum gas’ density cross- correlations. Our results show comparable outcomes for both measurement methods. The setup allows us to tune the disorder potential adapted to the characteristics of the quantum gas. These studies pave the way for investigating nonequilibrium physics in interacting quantum gases using controlled dynamical-disorder potentials.

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“…Improving the precision, speed and convenience of trap frequency measurement will allow higher precision investigations of BEC physics including many body physics phenomena (e.g. quantum depletion [7][8][9], thermalization [10], collective excitations [11], and phase transitions [12]) and improve the capability of curvature sensing.…”

Section: Introductionmentioning

confidence: 99%

Trap Frequency Measurement with a Pulsed Atom Laser

Henson,

Thomas,

Mehdi

et al. 2022

Preprint

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We describe a novel method of single-shot trap frequency measurement for a confined Bose-Einstein Condensate, which uses an atom laser to repeatedly sample the mean velocity of trap oscillations as a function of time. In our experiment this approach is able to determine the trap frequency to an accuracy of 39 ppm (16 mHz) in a single experimental realization, improving on the literature by a factor of three. Further, we show that by employing a reconstructive aliasing approach our method can be applied to trap frequencies much higher than the sampling frequency.

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Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials

Cited by 6 publications

References 47 publications

Two-body mobility edge in the Anderson-Hubbard model in three dimensions: Molecular versus scattering states

Two-body mobility edge in the Anderson-Hubbard model in three dimensions: Molecular versus scattering states

Characterizing quantum gases in time-controlled disorder realizations using cross-correlations of density distributions

Trap Frequency Measurement with a Pulsed Atom Laser

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