Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-07-04
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 5 figures; conference: EP2DS-15
Scientific paper
10.1016/j.physe.2003.11.208
The recent report on the observation of soft magnetorotons in the dispersion of charge-density excitations across the tunneling gap in coupled bilayers at total Landau level filling factor $\nu_T=1$ is reviewed. The inelastic light scattering experiments take advantage of the breakdown of wave-vector conservation that occurs under resonant excitation. The results offer evidence that in the quantum Hall state there is a roton that softens and sharpens markedly when the phase boundary for transitions to highly-correlated compressible states is approached. These findings are interpreted with Hartree-Fock evaluations of the dynamic structure factor. The model includes the effect of disorder in the breakdown of wave-vector conservation and resonance enhancement profiles within a phenomenological approach. These results link the softening of magnetorotons to enhanced excitonic Coulomb interactions in the ferromagnetic bilayers.
Dennis Brian S.
Luin Stefano
Pellegrini Vittorio
Pfeiffer Loren N.
Pinczuk Aron
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