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A quantum of rotational motion in a liquid, such as superfluid helium.



an elementary excitation (quasiparticle) in superfluid 4He with comparatively high energy & and momentum p. The dependence of the energy of the quasiparticles on the momentum ρ (dispersion relation) in superfluid 4He is shown in Figure 1.

Figure 1. Dependence on momentum of the energy of quasj-particles in superfluid helium

I. E. Tamm suggested the name “roton” for quasiparticles with momentum close to p0 In the linear region of (p) the quasiparticles are called phonons; quasiparticles in 4He with any value of ρ are sometimes called phonons. Roton spectra have been determined with high accuracy by means of inelastic neutron scattering in superfluid 4He.

Rotons play an important role in the properties of superfluid helium at T ≳ 0.6°K. They are responsible for the existence of components of heat capacity, entropy, normal density, and other properties that vary exponentially with temperature. The kinetic properties of superfluid 4He—for example, viscosity and sound absorption—have been explained on the basis of collisions and interconversion of rotons and phonons.


Khalatnikov, I. M. Teoriia sverkhtekuchesti. Moscow, 1971.


References in periodicals archive ?
1984), Dendroctonus frontalis (Strom and Roton 2009), and Xyleborus glabratus (Carrillo et al.
Chin and four associates describe how they can create roton structure in a new system: atomic superfluid of cesium-133 in the laboratory.
The Rood moved out from the abbey church into the market place, exposed as puppet theatre when prised from the wall by reformers and 'discovered' to have within it 'certen ingynes and olde wyer, wyth olde roton stykkes'.
Roton Middle School is a 98,000 s/f facility that currently serves 520 students in grades 6-8.
In fact, now, more than ever, space access and recovery systems remain in the low/zero speed realm, for example, the Roton [6] uses a helicopter reentry and the space lifeboat [7] uses a paraglider concept.
On its return, Roton would extend helicopter-style rotary blades to slow itself down and land.
DEBUT of the Roton, a reusable launch vehicle costing only pounds 1400 per kilogram of payload sent into low-Earth orbit (compared with about pounds 6,250 by Nasa's Shuttle) kicks off affordable space travel.
The Roton Rocket, built in the Mojave Desert, is designed to be the world's first one-stage, reusable space vehicle.
The brainchild of founders Martine van Hamel, Kevin McKenzie, Bentley Roton, and Gregory Cary, Kaatsbaan (which means "playing field" in Dutch) is a newly formed international dance center dedicated to providing a place to create new work in a beautiful, healthy environment.
A seat next to the pilot to orbit the Earth will cost pounds 15,000 on the Roton spacecraft.
He was at his winter home in Boca Roton on the Florida coast when he collapsed and was rushed to North Ridge Medical Centre in Forte Lauderdale.
Roton Middle School has run a Saturday Academy for seven years; the other three middle schools only have had sporadic funding to run the program.