Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials
Nagler B, Jaegering K, Sheikhan A, Barbosa S, Koch J, Eggert S, Schneider I, Widera A (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 101
Article Number: 053633
Journal Issue: 5
DOI: 10.1103/PhysRevA.101.053633
Abstract
We investigate dipole oscillations of ultracold Fermi gases along the BEC-BCS crossover through disordered potentials. We observe a disorder-induced damping of oscillations as well as a change of the fundamental Kohn-mode frequency. The measurement results are compared to numerical density matrix renormalization group calculations as well as to a three-dimensional simulation of noninteracting fermions. Experimentally, we find a disorder-dependent damping, which grows approximately with the second power of the disorder strength. Moreover, we observe experimentally a change of oscillation frequency which deviates from the expected behavior of a damped harmonic oscillator on a percent level. While this behavior is qualitatively expected from the theoretical models used, quantitatively the experimental observations show a significantly stronger effect than predicted by theory. Furthermore, while the frequency shift seems to scale differently with interaction strength in the BEC versus BCS regime, the damping coefficient apparently decreases with the strength of interaction, but not with the sign, which changes for BEC- A nd BCS-type Fermi gases. This is surprising, as the dominant damping mechanisms are expected to be different in the two regimes.
Involved external institutions
Technische Universität Kaiserslautern
Germany (DE)
Rheinische Friedrich-Wilhelms-Universität Bonn
Germany (DE)
Germany (DE)
Rheinische Friedrich-Wilhelms-Universität Bonn
Germany (DE)
How to cite
APA:
Nagler, B., Jaegering, K., Sheikhan, A., Barbosa, S., Koch, J., Eggert, S.,... Widera, A. (2020). Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials. Physical Review A, 101(5). https://dx.doi.org/10.1103/PhysRevA.101.053633
MLA:
Nagler, Benjamin, et al. "Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials." Physical Review A 101.5 (2020).
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