Observation of collapse of pseudospin order in bilayer quantum Hall ferromagnets

Details Observation of collapse of pseudospin order in bilayer quantum Hall ferromagnets Observation of collapse of pseudospin order in bilayer quantum Hall ferromagnets

2004-11-29

arxiv.org/abs/cond-mat/0411730v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

ReVTeX4, 4 pages, 3 EPS figures

Scientific paper

10.1103/PhysRevLett.94.146804

The Hartree-Fock paradigm of bilayer quantum Hall states with finite tunneling at filling factor $\nu$=1 has full pseudospin ferromagnetic order with all the electrons in the lowest symmetric Landau level. Inelastic light scattering measurements of low energy spin excitations reveal major departures from the paradigm at relatively large tunneling gaps. The results indicate the emergence of a novel correlated quantum Hall state at $\nu$=1 characterized by reduced pseudospin order. Marked anomalies occur in spin excitations when pseudospin polarization collapses by application of in-plane magnetic fields.

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