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DTSTART:20180325T030000
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DTSTART:20171029T020000
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DTSTAMP:20260424T073706Z
UID:593e7ce54d87a149088287@ist.ac.at
DTSTART:20171128T110000
DTEND:20171128T123000
DESCRIPTION:Speaker: Giulia De Rosi\nhosted by Mikhail Lemeshko\nAbstract: 
 Ultracold atoms are exceptional tools to explore the physics of quantum ma
 tter. In fact\, the high degree of tunability of ultracold Bose and Fermi 
 gases makes them ideal systems for quantum simulation and for investigatin
 g macroscopic manifestations of quantum effects\, such as superfluidity. I
 n ultracold gas research\, a central role is played by collective oscillat
 ions. They can be used to study different dynamical regimes\, such as supe
 rfluid\, collisional\, or collisionless limits or to test the equation of 
 state of the system. In this talk\, I will present a unified description o
 f collective oscillations in low dimensions covering both Bose and Fermi s
 tatistics\, different trap geometries and zero as well as finite temperatu
 re\, based on the formalism of hydrodynamics and sum rules. I will discuss
  the different behaviour exhibited by the second excited breathing mode in
  the collisional regime at low temperature and in the collisionless limit 
 at high temperature in a one-dimensional (1D) trapped Bose gas with repuls
 ive contact interaction. I will show how this mode exhibits a single-value
 d excitation spectrum in the collisional regime and two different frequenc
 ies in the collisionless limit. Our predictions could be important for fut
 ure research related to the thermalization and damping phenomena in this l
 ow-dimensional system. I will show that 1D uniform Bose gases exhibit a no
 n-monotonic temperature dependence of the chemical potential characterized
  by an increasing-with-temperature behaviour at low temperature. This is d
 ue to the thermal excitation of phonons and reveals an interesting analogy
  with the behaviour of superfluids. Finally\, I will discuss our research 
 on a gas with a finite number N of atoms in a ring geometry at zero temper
 ature. I will discuss explicitly the deviations of the thermodynamic behav
 iour in the ring from the one in the large N limit.
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Giulia De Rosi: Collective oscillations of a trapped atomic gas in 
 low dimensions & thermodynamics of one-dimensional Bose gas
URL:https://talks-calendar.ista.ac.at/events/887
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