Author:
Loktev V.M.,Tomchenko M.D.
Abstract
We calculate the probability of the creation of a circular phonon (c-phonon) in He II by a c-photon of the resonator. It is shown that this probability has sharp maxima at frequencies, where the effective group velocity of the c-phonon is equal to zero; the density of states of c-phonons strongly grows at such frequencies. For He II, these frequencies correspond to a roton and a maxon. From theprobability of the c-roton creation, we calculate the roton line width which is found to approximately agree with the experimental one. We conclude that the roton line observed in the super-high-frequency (SHF) absorption spectrum of helium is related to the creation of c-rotons. A possible interpretation of the Stark effect observed for the roton line is also proposed.
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
Subject
General Physics and Astronomy
Reference21 articles.
1. 1. A. Rybalko, S. Rubets, E. Rudavskii, V. Tikhiy, S. Tarapov, R. Golovashchenko, and V. Derkach, Phys. Rev. B 76, 140503(R) (2007).
2. 2. A.S. Rybalko, S.P. Rubets, E.Ya. Rudavskii, V.A. Tikhiy, Yu.M. Poluektov, R.V. Golovashchenko, V.N. Derkach, S.I. Tarapov, and O.V. Usatenko, Low Temp. Phys. 35, 837 (2009).
3. 3. V.M. Loktev and M.D. Tomchenko, Ukr. J. Phys. 55, 901 (2010).
4. 4. V.M. Loktev and M.D. Tomchenko, Phys. Rev. B 82, 172501 (2010).
5. 5. L.D. Landau, E.M. Lifshitz, Quantum Mechanics. Non-Relativistic Theory (Pergamon, New York, 1980).