Transition from Free to Interacting Composite Fermions away from $ν$=1/3

Details Transition from Free to Interacting Composite Fermions away from $ν$=1/3 Transition from Free to Interacting Composite Fermions away from $ν$=1/3

2006-05-15

arxiv.org/abs/cond-mat/0605388v2

Phys. Rev. Lett. 97, 036804 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, to appear in PRL

Scientific paper

10.1103/PhysRevLett.97.036804

Spin excitations from a partially populated composite fermion level are studied above and below $\nu=1/3$. In the range $2/7<\nu<2/5$ the experiments uncover significant departures from the non-interacting composite fermion picture that demonstrate the increasing impact of interactions as quasiparticle Landau levels are filled. The observed onset of a transition from free to interacting composite fermions could be linked to condensation into the higher order states suggested by transport experiments and numerical evaluations performed in the same filling factor range.

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