Specular and diffuse scattering of quasiparticles by a macroscopic object moving through superfluid3He-B
| Autor: | M. P. Enrico, R. J. Watts-Tobin |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Physics
Surface (mathematics) Condensed matter physics Scattering Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Andreev reflection Superfluidity Drag Quasiparticle General Materials Science Specular reflection Isotopes of helium |
| Zdroj: | Journal of Low Temperature Physics. 102:103-116 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/bf00755112 |
| Popis: | When a wire resonator is moving in superfluid3He-B at low temperature, there is a drag force due to scattering of thermally excited quasiparticles. The form of the graph of the drag force against the wire velocity depends strongly on the type of scattering at the wire surface. The force always rises linearly at zero velocity, and it tends to a limiting value at high wire velocity. However the graph is much more sharply curved if the scattering is diffuse than if it is specular. Here we present an analytic study of the form of the graph, by making estimates of the effect of Andreev reflection of scattered quasiparticles in the superflow round the wire. We show that the differences between diffuse and specular scattering can be understood intuitively, by considering the geometrical restrictions imposed by Andreev reflection on the scattering at the wire surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink