Finite-size effects in the dynamics of few bosons in a ring potential

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We study the temporal evolution of a small number N of ultra-cold bosonic atoms confined in a ring potential. Assuming that initially the system is in a solitary-wave solution of the corresponding mean-field problem, we identify significant differences in the time evolution of the density distribution of the atoms when it instead is evaluated with the many-body Schrödinger equation. Three characteristic timescales are derived: the first is the period of rotation of the wave around the ring, the second is associated with a 'decay' of the density variation, and the third is associated with periodic 'collapses' and 'revivals' of the density variations, with a factor of separating each of them. The last two timescales tend to infinity in the appropriate limit of large N, in agreement with the mean-field approximation. These findings are based on the assumption of the initial state being a mean-field state. We confirm this behavior by comparison to the exact solutions for a few-body system stirred by an external potential. We find that the exact solutions of the driven system exhibit similar dynamical features.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Selcuk University
  • Technological Educational Institute of Crete
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik

Nyckelord

Originalspråkengelska
Artikelnummer035504
TidskriftJournal of Physics B: Atomic, Molecular and Optical Physics
Volym51
Utgåva nummer3
StatusPublished - 2018 jan 16
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Gunnar Eriksson, 2020 mar 26, Lund: Department of Physics, Lund University. 170 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

Visa alla (1)