• Overview of Chinese core journals
  • Chinese Science Citation Database(CSCD)
  • Chinese Scientific and Technological Paper and Citation Database (CSTPCD)
  • China National Knowledge Infrastructure(CNKI)
  • Chinese Science Abstracts Database(CSAD)
  • JST China
  • SCOPUS
Superfluidity in bose-einstein condensates[J]. PHYSICS, 2002, 31(01).
Citation: Superfluidity in bose-einstein condensates[J]. PHYSICS, 2002, 31(01).

Superfluidity in bose-einstein condensates

More Information
  • Published Date: January 19, 2002
  • In general,the mean-field-approximation(MFA) is adopted to solve the Gross-Pitaevskii equation in studies of superfluidity in Bose-Einstein condensates. However, we use the more rigorous exact diagonalizatio method(EDM) to investigate the state of a condensate with weak repulsive inter action in a two-dimensional N-boson system under rotation. The results show that the ground state is a fragmented condensate state instead of a single condensate state, contrary to what one might expect. By comparing the energy spectrm of the fragmented state in EDM with that given by the mean-field-approximation and calculating the conditional probability distribution, we find that the fragmented state is intrinsically unstable and tends to decay spontaneously to a single condensate state. The conditional probability distribution reveals the state after symmetry breaking, and vortex pictures similar to those under MFA are obtained. Moreover, on the basis of previous works on superfluidity which mainly considered the two extreme limits of weak interaction and strong Thomas-Fermi interaction we further study the ground-state properties of the system with medium interaction strength.
  • Related Articles

    [1]LI Xin-Yang, JIN Yu-Liang. Symmetry in disorder——on the 2021 Nobel Prize in Physics[J]. PHYSICS, 2022, 51(1): 29-34. DOI: 10.7693/wl20220105
    [2]Christopher Gutiérrez. Shining a light on chiral symmetry breaking in graphene[J]. PHYSICS, 2021, 50(8): 547-547.
    [3]TANG Feng, WAN Xian-Gang. Efficient topological materials discovery using symmetry indicators[J]. PHYSICS, 2019, 48(6): 341-356. DOI: 10.7693/wl20190601
    [4]CHEN Yong-Shou. Tetrahedral symmetry in atomic nuclei[J]. PHYSICS, 2015, 44(05): 298-303. DOI: 10.7693/wl20150503
    [5]Emergent phenomena in physics[J]. PHYSICS, 2010, 39(08): 543-549.
    [6]The origin of mass revisited[J]. PHYSICS, 2009, 38(10): 699-706.

Catalog

    Article views (194) PDF downloads (1709) Cited by()

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return