Imperial College London
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DrRyanBarnett

Faculty of Natural Sciences, Department of Mathematics

Reader in Condensed Matter Theory
 
 
 
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Contact

 

+44 (0)20 7594 8536r.barnett Website

 
 
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Location

 

6M49Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Payrits:2014:10.1103/PhysRevA.90.013608,
author = {Payrits, M and Barnett, R},
doi = {10.1103/PhysRevA.90.013608},
journal = {Physical Review A},
title = {Order-by-disorder degeneracy lifting of interacting bosons on the dice lattice},
url = {http://dx.doi.org/10.1103/PhysRevA.90.013608},
volume = {90},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Motivated by recent experimental progress in the realization of synthetic gauge fields in systems of ultracold atoms, we consider interacting bosons on the dice lattice with half flux per plaquette. All bands of thenoninteracting spectrum of this system were previously found to have the remarkable property of being completely dispersionless. We show that degeneracies remain when interactions are treated at the level of mean-field theory, and the ground state exhibits vortex lattice configurations already established in the simpler XY model in thesame geometry. We argue that including quantum and thermal fluctuations will select a unique vortex lattice up to overall symmetries based on the order-by-disorder mechanism. We verify the stability of the selected state by analyzing the condensate depletion. The latter is shown to exhibit an unusual nonmonotonic behavior as afunction of the interaction parameters which can be understood as a consequence of the dispersionless nature of the noninteracting spectrum. Finally, we comment on the role of domain walls which have interactions mediated through fluctuations.
AU  - Payrits,M
AU  - Barnett,R
DO  - 10.1103/PhysRevA.90.013608
PY  - 2014///
SN  - 1094-1622
TI  - Order-by-disorder degeneracy lifting of interacting bosons on the dice lattice
T2  - Physical Review A
UR  - http://dx.doi.org/10.1103/PhysRevA.90.013608
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000339443300016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/38725
VL  - 90
ER  -
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