Neutral Collective Excitations in Striped Hall States
arXiv:cond-mat/0209227 · doi:10.1016/S1386-9477(02)01042-1
Abstract
In the striped Hall state, a magnetic translation in one direction is spontaneously broken to the discrete translation. The spectrum of the neutral collective excitation is obtained in the single mode approximation at half-filled third and fourth Landau levels. The spectrum is anisotropic and has a multiple line node structure. In one direction, the spectrum resembles the liquid Helium spectrum with the phonon and roton minimum.
2 pages, 2 figures, LT23 Hiroshima