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Observation of vortices in a dipolar supersolid.
Nature
November 2024
Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria.
Supersolids are states of matter that spontaneously break two continuous symmetries: translational invariance owing to the appearance of a crystal structure and phase invariance owing to phase locking of single-particle wavefunctions, responsible for superfluid phenomena. Although originally predicted to be present in solid helium, ultracold quantum gases provided a first platform to observe supersolids, with particular success coming from dipolar atoms. Phase locking in dipolar supersolids has been investigated through, for example, measurements of the phase coherence and gapless Goldstone modes, but quantized vortices, a hydrodynamic fingerprint of superfluidity, have not yet been observed.
View Article and Find Full Text PDFQubit analog with polariton superfluid in an annular trap.
Sci Adv
October 2024
Key Laboratory for Quantum Materials of Zhejiang Province, Physics Department, Westlake University, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, China.
We report on the experimental realization and characterization of a qubit analog with semiconductor exciton-polaritons. In our system, a polaritonic condensate is confined by a spatially patterned pump laser in an annular trap that supports energy-degenerate vortex states of the polariton superfluid. Using temporal interference measurements, we observe coherent oscillations between a pair of counter-circulating vortex states coupled by elastic scattering of polaritons off the laser-imprinted potential.
View Article and Find Full Text PDFPredicting Bubble Fragmentation in Superfluids.
Phys Rev Lett
August 2024
Joint Quantum Centre (JQC) Durham-Newcastle, School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.
In classical fluids, the Weber number is a dimensionless parameter that characterizes the flow of a multiphase fluid. The superfluid analogy of a classical multiphase fluid can be realized in a system of two or more immiscible Bose-Einstein condensates. These superfluid mixtures have been shown to display a wider variety of exotic dynamics than their single component counterparts.
View Article and Find Full Text PDFTheory of topological exciton insulators and condensates in flat Chern bands.
Proc Natl Acad Sci U S A
August 2024
Department of Physics and Astronomy, Center for Quantum Research and Technology, University of Oklahoma, Norman, OK 73069.
Excitons are the neutral quasiparticles that form when Coulomb interactions create bound states between electrons and holes. Due to their bosonic nature, excitons are expected to condense and exhibit superfluidity at sufficiently low temperatures. In interacting Chern insulators, excitons may inherit the nontrivial topology and quantum geometry from the underlying electron wavefunctions.
View Article and Find Full Text PDFSuperconductivity of Co-Doped CaKFeAs Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements.
Nanomaterials (Basel)
August 2024
Department of Applied Science and Technology, Politecnico di Torino, I-10129 Torino, Italy.
The iron-based superconductors (IBSs) of the recently discovered 1144 class, unlike many other IBSs, display superconductivity in their stoichiometric form and are intrinsically hole doped. The effects of chemical substitutions with electron donors are thus particularly interesting to investigate. Here, we study the effect of Co substitution in the Fe site of CaKFe4As4 single crystals on the critical temperature, on the energy gaps, and on the superfluid density by using transport, point-contact Andreev-reflection spectroscopy (PCARS), and London penetration depth measurements.
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