2,252 research outputs found
Discrete symmetries in the cluster shell model
The role of discrete (or point-group) symmetries is discussed in the
framework of the Cluster Shell Model which describes the splitting of
single-particle levels in the deformed field of cluster potentials. We discuss
the classification of the eigenstates for the cases of a triangular and
tetrahedral configuration of alpha-particles in terms of the irreducible
representations of the double point groups D'(3h) and T'(d), respectively, and
show how the discrete symmetry of a given eigenstate can be determined.
Finally, we derive the Coriolis coupling for each one of these geometrical
configurations.Comment: 13 pages, 5 figures, 4 tables, to be published in EPJ-ST on
"Symmetries in Atomic Nuclei. New Perspectives
Electromagnons in multiferroic YMn2O5 and TbMn2O5
Based on temperature dependent far infrared transmission spectra of YMn2O5
and TbMn2O5 single crystals, we report the observation of electric
dipole-active magnetic excitations, or electromagnons, in these multiferroics.
Electromagnons are found to be directly responsible for the step-like anomaly
of the static dielectric constant at the commensurate--incommensurate magnetic
transition and are the origin of the colossal magneto-dielectric effect
reported in these multiferroics.Comment: 4 pages, 4 figures, submitte
Experimental investigation of dynamical invariants in bipartite entanglement
The non-conservation of entanglement, when two or more particles interact,
sets it apart from other dynamical quantities like energy and momentum. It does
not allow the interpretation of the subtle dynamics of entanglement as a flow
of this quantity between the constituents of the system. Here we show that
adding a third party to a two-particle system may lead to a conservation law
that relates the quantities characterizing the bipartite entanglement between
each of the parties and the other two. We provide an experimental demonstration
of this idea using entangled photons, and generalize it to N-partite GHZ
states
Spin phonon coupling in frustrated magnet CdCrO
The infrared phonon spectrum of the spinel CdCr2O4 is measured as a function
temperature from 6 K to 300K. The triply degenerate Cr phonons soften in the
paramagnetic phase as temperature is lowered below 100 K and then split into a
singlet and doublet in the low T antiferromagnetic phase which is tetragonally
distorted to relieve the geometric frustration in the pyrochlore lattice of
Cr ions. The phonon splitting is inconsistent with the simple increase
(decrease) in the force constants due to deceasing (increasing) bond lengths in
the tetragonal phase. Rather they correspond to changes in the force constants
due to the magnetic order in the antiferromagnetic state. The phonon splitting
in this system is opposite of that observed earlier in ZnCr2O4 as predicted by
theory. The magnitude of the splitting gives a measure of the spin phonon
coupling strength which is smaller than in the case of ZnCr2O4.Comment: 4.2 pages, 4 figures, 1 reference added, submmite
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