Physics – Condensed Matter
Scientific paper
1996-03-11
J. Low Temp. Phys. 104 (1996) 367
Physics
Condensed Matter
Uuencoded file including: REVTEX (35 pages) and 7 figures, also available at http://anubis.science.unitn.it/~dalfovo/papers/pa
Scientific paper
10.1007/BF00751863
The scattering of atoms and rotons at the free surface of superfluid 4He is studied in the framework of linearised time dependent mean field theory. The phenomenological Orsay-Trento density functional is used to solve numerically the equations of motion for the elementary excitations in presence of a free surface and to calculate the flux of rotons and atoms in the reflection, condensation, and evaporation processes. The probability associated with each process is evaluated as a function of energy, for incident angles such that only rotons and atoms are involved in the scattering. The evaporation probability for R+ rotons is predicted to increase quite rapidly from zero, near the roton minimum, to 1 as the energy increases. Conversely the evaporation from R- rotons remains smaller than 0.25 for all energies. Close to the energy of the roton minimum the mode-change process is the dominant one. The consistency of the results with general properties of the scattering matrix, such as unitarity and time reversal, is explicitly discussed. The condensation of atoms into bulk excitations is also investigated.
Dalfovo Franco
Fracchetti A.
Lastri Andrea
Pitaevskii Lev
Stringari Sandro
No associations
LandOfFree
Quantum Evaporation from the Free Surface of Superfluid 4He does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quantum Evaporation from the Free Surface of Superfluid 4He, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum Evaporation from the Free Surface of Superfluid 4He will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1601