Calendario Attività

Casimir force fluctuations on impurities immersed in coherent fermionic fluids

Categoria
Seminario
Data
28 Febbraio 2018 15:30 - 17:00
Luogo
14 - 15 IV piano St. 9
Email
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Affiliation
Dipartimento di Fisica ``E. R. Caianiello``
Area di Ricerca
Transizioni di fase, Sistemi condensati e a molti corpi, Fisica Statistica e loro applicazioni

Per celebrare 10 anni di attivit? scientifica post-dottorato il Dr F. Romeo terr? un ultimo seminario su un tema di recente interesse. Si allega l`abstract dell`intervento. We study the mechanical actions affecting close scatterers immersed in a coherent fermionic fluid. Using a scattering field theory, we theoretically analyze the single-scatterer and the two-scatterer case. Concerning the single-scatterer case, we find that a net force affects the scatterer dynamics only in non-equilibrium condition, i.e. imposing the presence of a non-vanishing particle current flowing through the system. The force fluctuation (variance) is instead not negligible both in equilibrium and in non-equilibrium conditions. Concerning the two-scatterer case, an attractive fluid-mediated Casimir force is experienced by the scatterers at small spatial separation, while a decaying attractive/repulsive behavior as a function of the scatterer separation is found. Furthermore, the Casimir force fluctuations acting on a given scatterer in close vicinity of the other present an oscillating behavior reaching a long distance limit comparable to the noise level of the single-scatterer case. The relevance of these findings is discussed in connection with fluctuation phenomena in low-dimensional nanostructures and cold atoms systems. [1] Romeo, F. Eur. Phys. J. B (2016) 89: 242. https://doi.org/10.1140/epjb/e2016-70379-8

 
 

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