67 research outputs found
Note on Angular Momentum of Phonons in Chiral Crystals
Phonon angular momentum in chiral materials has been widely studied in
spintronics and condensed matter physics. In chiral crystals, this is not the
conserved quantity in contrast to the pseudo-angular momentum. To highlight
this point and to understand the behavior of the angular momentum, we
reexamined phonon dispersion theory based on the irreducible representation of
helix and found the distinction of these angular momentum is originated from
chirality.Comment: 2 pages, 2 figure
Interplay of randomness, electron correlation, and dimensionality effects in quasi-one-dimensional conductors
We study the interplay of randomness, electron correlation, and dimensionality effects in weakly coupled half-filled Hubbard chains with weak quenched random potentials, based on the renormalization-group (RG) approach. We perform a two-loop RG analysis of an effective action derived by using the replica trick, and examine the following crossovers and phase transitions from an incoherent metal regime: (1) a crossover to the Anderson localization regime, (2) an antiferromagnetic phase transition, and (3) a crossover to the quasi-one-dimensional weak-localization regime. The case of d=1+ε (ε≪1) dimensions is also mentioned
Theory of spin resonance in a chiral helimagnet
It is suggested that marked features of symmetry-breaking mechanism and elementary excitations in chiral helimagnet come up as visible effects in electron-spin-resonance ESR profile. Under the magnetic field applied parallel and perpendicular to the helical axis, elementary excitations are, respectively, described by the helimagnon associated with rotational symmetry breaking and the magnetic kink crystal phonon associated with translational symmetry breaking. We demonstrate how the ESR spectra distinguish these excitations
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