Volume 123, Number 2, July 2018
|Number of page(s)||7|
|Published online||20 August 2018|
Signatures of two-step impurity-mediated vortex lattice melting in Bose-Einstein condensates
1 Department of Physics, SP Pune University - Pune 411007, India
2 Tata Institute of Fundamental Research - Mumbai 400005, India
Received: 18 April 2018
Accepted: 20 July 2018
We simulate a rotating 2D BEC to study the melting of a vortex lattice in the presence of random impurities. Impurities are introduced either through a protocol in which vortex lattice is produced in an impurity potential or first creating the vortex lattice in the absence of random pinning and then cranking up the (co-rotating) impurity potential. We find that for a fixed strength, pinning of vortices at randomly distributed impurities leads to the new states of the vortex lattice. It is unearthed that the vortex lattice follows a two-step melting via loss of positional and orientational order. Also, the comparisons between the states obtained in two protocols show that the vortex lattice states are metastable states when impurities are introduced after the formation of an ordered vortex lattice. We also show that the existence of metastable states depends on the history of how the vortex lattice is created.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 67.85.Hj – Bose-Einstein condensates in optical potentials
© EPLA, 2018
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