Role of geometry in the superfluid flow of nonlocal photon fluids
Wright, Ewan M.
Anderson, Brian P.
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationRole of geometry in the superfluid flow of nonlocal photon fluids 2016, 94 (1) Physical Review A
JournalPhysical Review A
Rights©2016 American Physical Society
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractRecent work has unveiled a new class of optical systems that can exhibit the characteristic features of superfluidity. One such system relies on the repulsive photon-photon interaction that is mediated by a thermal optical nonlinearity and is therefore inherently nonlocal due to thermal diffusion. Here we investigate how such a nonlocal interaction, which at a first inspection would not be expected to lead to superfluid behavior, may be tailored by acting upon the geometry of the photon fluid itself. Our models and measurements show that restricting the laser profile and hence the photon fluid to a strongly elliptical geometry modifies thermal diffusion along the major beam axis and reduces the effective nonlocal interaction length by two orders of magnitude. This in turn enables the system to display a characteristic trait of superfluid flow: the nucleation of quantized vortices in the flow past an extended physical obstacle. These results are general and apply to other nonlocal fluids, such as dipolar Bose-Einstein condensates, and show that "thermal" photon superfluids provide an exciting and novel experimental environment for probing the nature of superfluidity, with applications to the study of quantum turbulence and analog gravity.
VersionFinal published version
SponsorsEuropean Research Council under the European Unions Seventh Framework Programme (FP)/ERC [GA 306559]; EPSRC (UK) [EP/J00443X/1]; ERC through the QGBE grant; EU-FET Proactive grant AQuS ; Autonomous Province of Trento, through the SiQuro project ("On Silicon Chip Quantum Optics for Quantum Computing and Secure Communications")