Dipole oscillations of fermionic quantum gases along the BEC-BCS crossover in disordered potentials
| Autor: | Kevin Jägering, Benjamin Nagler, Jennifer Koch, Sian Barbosa, Ameneh Sheikhan, Imke Schneider, Artur Widera, Sebastian Eggert |
|---|---|
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review A. 101 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.101.053633 |
| Popis: | 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- and BCS-type Fermi gases. This is surprising, as the dominant damping mechanisms are expected to be different in the two regimes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|