NMR Investigation of How Free Composite Fermions Are at [Formula presented]

N. Freytag, M. Horvatić, C. Berthier, M. Shayegan, L. P. Lévy

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Abstract

NMR measurements of the electron spin polarization ([Formula presented]) have been performed on a 2D electron system at and around half-filled lowest Landau level. Comparing the magnetic field and the temperature dependence of [Formula presented] to models of free and interacting composite fermions (CF), the imbalance of spin-up and spin-down CF Fermi seas is mapped as a function of Zeeman energy. Independent measurements of the CF effective mass, [Formula presented] factor, and Fermi energy are obtained from the thermal activation of [Formula presented] in tilted fields. The filling factor dependence of the [Formula presented] for [Formula presented] reveals a broken particle-hole symmetry for the partially polarized CF Fermi sea.

Original languageEnglish (US)
JournalPhysical review letters
Volume89
Issue number24
DOIs
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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