density wave

density wave

[′den·səd·ē ‚wāv]
(physics)
A sound wave or other type of material wave which causes the density of the matter through which it passes to alternately rise above and drop below its mean value.
References in periodicals archive ?
v=_GNPvYdvZAQ) density wave theory , in which the movement of the spiral arms is seen as different from the movement of actual matter (stars, gas, dust and planets) in them.
It could be an immense density wave moving through the galaxy.
Recent breakthroughs in high-temperature superconductivity have revealed a complex competition between the superconductive state and charge density wave order fluctuations.
Using ultrafast spectroscopy, Mahmood and co-authors of a 2013 Nature Materials paper were able to show that for extremely short periods of time " up to about 2 picoseconds " electrons clustered in a density wave that could be measured by its amplitude and phase.
There are new chapters on topics such as Dirac electrons, super symmetry, charge density wave states in higher Landau levels, and unconventional QH effects in graphene.
When millions of ring particles in the same region become perturbed in this way, they generate a spiral density wave that propagates away from the disturbance.
c] = 42 K, the highest of any 2-1-4 system, while long range spin density wave magnetic order of the Cu moments is also observed in this material.
This work now centres on analyzing the microscopic changes taking place within a superconductor when it hits that key temperature where mobile electrons organize into a wave-like periodic structure called a charge density wave.
Furthermore, the microscopic mechanism of charge density wave capture at singular pinning sites will be addressed.
On the basis of their observations and modeling according to spiral density wave theory, the team suspects that dynamic processes, possibly resulting from planets in the disk, may be responsible for its spiral shape.
Specific topics include the mutual attractive interaction between polarons giving rise to non- symmetry-breaking metal-insulator transitions, symmetry-breaking metal-charge density wave insulator transitions, bipolaronic superconductivity and resonant pairing, electron-density-driven polarization catastrophes, Wigner crystallization in systems with long-range Coulomb interaction, and the influence of strong correlations as well as orbital degeneracy on the effectiveness of the electron-phonon interaction.