Observation of soft magnetorotons in bilayer quantum Hall ferromagnets

Details Observation of soft magnetorotons in bilayer quantum Hall ferromagnets Observation of soft magnetorotons in bilayer quantum Hall ferromagnets

2003-01-16

arxiv.org/abs/cond-mat/0301295v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

ReVTeX4, 4 pages, 4 EPS figures

Scientific paper

10.1103/PhysRevLett.90.236802

Inelastic light scattering measurements of low-lying collective excitations of electron double layers in the quantum Hall state at total filling nu_T=1 reveal a deep magnetoroton in the dispersion of charge-density excitations across the tunneling gap. The roton softens and sharpens markedly when the phase boundary for transitions to highly correlated compressible states is approached. The findings are interpreted with Hartree-Fock evaluations that link soft magnetorotons to enhanced excitonic Coulomb interactions and to quantum phase transitions in the ferromagnetic bilayers.

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