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Vortex-bound solitons in topological superfluidHe.
J Phys Condens Matter
March 2023
Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.
The different superfluid phases ofHe are described by-wave order parameters that include anisotropy axes both in the orbital and spin spaces. The anisotropy axes characterize the broken symmetries in these macroscopically coherent quantum many-body systems. The systems' free energy has several degenerate minima for certain orientations of the anisotropy axes.
View Article and Find Full Text PDFTriangular Pair Density Wave in Confined Superfluid ^{3}He.
Phys Rev Lett
January 2022
Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.
Recent advances in experiment and theory suggest that superfluid ^{3}He under planar confinement may form a pair density wave (PDW) whereby superfluid and crystalline orders coexist. While a natural candidate for this phase is a unidirectional stripe phase predicted by Vorontsov and Sauls in 2007, recent nuclear magnetic resonance measurements of the superfluid order parameter rather suggest a two-dimensional PDW with noncollinear wave vectors, of possibly square or hexagonal symmetry. In this Letter, we present a general mechanism by which a PDW with the symmetry of a triangular lattice can be stabilized, based on a superfluid generalization of Landau's theory of the liquid-solid transition.
View Article and Find Full Text PDFAngular Momentum in Rotating Superfluid Droplets.
Phys Rev Lett
May 2020
Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA.
The angular momentum of rotating superfluid droplets originates from quantized vortices and capillary waves, the interplay between which remains to be uncovered. Here, the rotation of isolated submicrometer superfluid ^{4}He droplets is studied by ultrafast x-ray diffraction using a free electron laser. The diffraction patterns provide simultaneous access to the morphology of the droplets and the vortex arrays they host.
View Article and Find Full Text PDFHigh-pressure transitions are thought to modify hydrogen molecules to a molecular metallic solid and finally to an atomic metal, which is predicted to have exotic physical properties and the topology of a two-component (electron and proton) superconducting superfluid condensate. Therefore, understanding such transitions remains an important objective in condensed matter physics. However, measurements of the crystal structure of solid hydrogen, which provides crucial information about the metallization of hydrogen under compression, are lacking for most high-pressure phases, owing to the considerable technical challenges involved in X-ray and neutron diffraction measurements under extreme conditions.
View Article and Find Full Text PDFEvidence for a Spatially Modulated Superfluid Phase of ^{3}He under Confinement.
Phys Rev Lett
March 2019
Department of Physics, Cornell University, Ithaca, New York 14853, USA.
In superfluid ^{3}He-B confined in a slab geometry, domain walls between regions of different order parameter orientation are predicted to be energetically stable. Formation of the spatially modulated superfluid stripe phase has been proposed. We confined ^{3}He in a 1.
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