Sound propagation and quantum limited damping in a two-dimensional Fermi gas
| Autor: | Niclas Luick, Lennart Sobirey, Tilman Enss, Henning Moritz, Thomas Lompe, Hauke Biss, Markus Bohlen |
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| Přispěvatelé: | Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases etc Condensed matter physics General Physics: Statistical and Quantum Mechanics General Physics and Astronomy FOS: Physical sciences Perfect fluid Thermal diffusivity 01 natural sciences [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] Thermal conductivity Quantum Gases (cond-mat.quant-gas) Speed of sound 0103 physical sciences Quantum Information Quantum information Condensed Matter - Quantum Gases 010306 general physics Fermi gas Quantum Fermi Gamma-ray Space Telescope |
| Zdroj: | Phys.Rev.Lett. Phys.Rev.Lett., 2020, 124 (24), pp.240403. ⟨10.1103/PhysRevLett.124.240403⟩ |
| DOI: | 10.1103/PhysRevLett.124.240403⟩ |
| Popis: | International audience; Strongly interacting two-dimensional Fermi systems are one of the great remaining challenges in many-body physics due to the interplay of strong local correlations and enhanced long-range fluctuations. Here, we probe the thermodynamic and transport properties of a 2D Fermi gas across the BEC-BCS crossover by studying the propagation and damping of sound modes. We excite particle currents by imprinting a phase step onto homogeneous Fermi gases trapped in a box potential and extract the speed of sound from the frequency of the resulting density oscillations. We measure the speed of sound across the BEC-BCS crossover and compare the resulting dynamic measurement of the equation of state both to a static measurement based on recording density profiles and to quantum Monte Carlo calculations and find reasonable agreement between all three. We also measure the damping of the sound mode, which is determined by the shear and bulk viscosities as well as the thermal conductivity of the gas. We find that the damping is minimal in the strongly interacting regime and the diffusivity approaches the universal quantum bound ℏ/m of a perfect fluid. |
| Databáze: | OpenAIRE |
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