Observation of Collective Excitations of the Dilute 2D Electron System

Details Observation of Collective Excitations of the Dilute 2D Electron System Observation of Collective Excitations of the Dilute 2D Electron System

1998-10-23

arxiv.org/abs/cond-mat/9810307v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.82.2163

We report inelastic light scattering measurements of dispersive spin and charge density excitations in dilute 2D electron systems reaching densities less than 10^{10} cm^{-2}. In the quantum Hall state at nu=2, roton critical points in the spin inter--Landau level mode show a pronounced softening as r_s is increased. Instead of a soft mode instability predicted by Hartree--Fock calculations for r_s ~ 3.3, we find evidence of multiple rotons in the dispersion of the softening spin excitations. Extrapolation of the data indicates the possibility of an instability for r_s >~ 11.

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