Transport of bound quasiparticle states in a two-dimensional boundary superfluid
arXiv:2303.16518 · doi:10.1038/s41467-023-42520-y
Abstract
The B phase of superfluid 3He can be cooled into the pure superfluid regime, where the thermal quasiparticle density is negligible. The bulk superfluid is surrounded by a quantum well at the boundaries of the container, confining a sea of quasiparticles with energies below that of those in the bulk. We can create a non-equilibrium distribution of these states within the quantum well and observe the dynamics of their motion indirectly. Here we show that the induced quasiparticle currents flow diffusively in the two-dimensional system. Combining this with a direct measurement of energy conservation, we conclude that the bulk superfluid 3He is effectively surrounded by an independent two-dimensional superfluid, which is isolated from the bulk superfluid but which readily interacts with mechanical probes. Our work shows that this two-dimensional quantum condensate and the dynamics of the surface bound states are experimentally accessible, opening the possibility of engineering two-dimensional quantum condensates of arbitrary topology.
arXiv comment11 pages, 9 figures
References in corpus (38)
- Classification of topological insulators and superconductors in three spatial dimensions
- Observation of time quasicrystal and its transition to superfluid time crystal
- Detecting the Majorana fermion surface state of He-B through spin relaxation
- Symmetry Protected Topological Superfluids and Superconductors --- From the Basics to He ---
- Observation of half-quantum vortices in topological superfluid 3He
- Polar phase of superfluid 3He in anisotropic aerogel
- Thermodynamic properties of thin films of superfluid 3He-A
- Fermion zero modes at the boundary of superfluid 3He-B
- AC Josephson effect between two superfluid time crystals
- Surface Majorana Cone of the Superfluid He B Phase
- Evidence for a Spatially-Modulated Superfluid Phase of He under Confinement
- Stabilized Pair Density Wave via Nanoscale Confinement of Superfluid He
- Surface Specific Heat of He and Andreev Bound States
- Majorana Excitations, Spin- and Mass Currents on the Surface of Topological Superfluid He-B
- The A-B transition in superfluid 3He under confinement in a thin slab geometry
- Exceeding the Landau superflow speed limit with topological Bogoliubov Fermi surfaces
- Breaking the superfluid speed limit
- Anomalous Attenuation of Transverse Sound in 3He
- Andreev-Majorana bound states in superfluids
- Nonlinear two-level dynamics of quantum time crystals
- Anomalous Damping of a Micro-electro-mechanical Oscillator in Superfluid He-B
- Fragility of surface states in topological superfluid He
- Bose-Einstein condensation of magnons and spin superfluidity in the polar phase of He
- Enhanced vortex heat conductance in mesoscopic superconductors
- Propagation of self-localised Q-ball solitons in the He universe
- Bolometric calibration of a superfluid He detector for Dark Matter search: direct measurement of the scintillated energy fraction for neutron, electron and muon events
- Fundamental dissipation due to bound fermions in the zero-temperature limit
- Study of superfluid He under nanoscale confinement. A new approach to the investigation of superfluid He films
- A Method for Driving an Oscillator at a Quasi-Uniform Velocity
- Review: Observation of Majorana Bound States at a Free Surface of He-B
- Thermal transport of helium-3 in a strongly confining channel
- Scattering theory on surface Majorana fermions by an impurity in 3He-B
- NMR properties of the polar phase of superfluid He-3 in anisotropic aerogel under rotation
- Effect of boundary condition on Kapitza resistance between superfluid He-B and sintered metal
- Design of a system for controlling a levitating sphere in superfluid He at extremely low temperatures
- Magnetic Susceptibility of Andreev Bound States in Superfluid He-B
- Progress on levitating a sphere in cryogenic fluids
- Overcritical Fermi Superfluids
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- Drag on Cylinders Moving in Superfluid 3He-B as the Dimension Spans the Coherence Length