Evidence for Roton Pair Creation in Superfluid
- 31 May 1976
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 36 (22), 1313-1316
- https://doi.org/10.1103/physrevlett.36.1313
Abstract
We have measured the drift velocity of negative ions through superfluid for temperatures K, under a pressure of 25 bar, for electric fields V . From the observed form of , we deduce that roton emission from an ion traveling faster than the Landau critical velocity is governed by hitherto unrecognized selection rules whereby the rotons can be created only in pairs.
Keywords
This publication has 3 references indexed in Scilit:
- Breaking the Roton Barrier: An Experimental Study of Motion Faster than the Landau Critical Velocity for Roton Creation in He IIPhysical Review Letters, 1974
- Pressure Dependence of Charge Carrier Mobilities in Superfluid HeliumPhysical Review A, 1973
- The Landau parameters in helium IIPhysics Letters A, 1972