title: NMR investigation of how free composite fermions are at nu=1 / 2.
abstract: NMR measurements of the electron spin polarization (P) 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 P 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, g factor, and Fermi energy are obtained from the thermal activation of P in tilted fields. The filling factor dependence of the P for 2 / 5<nu<2 / 3 reveals a broken particle-hole symmetry for the partially polarized CF Fermi sea.
authors.affiliation: Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, B.P. 166, France. N.Freytag@fkf.mpg.de
authors.forename: N
authors.initials: N
authors.lastname: Freytag
authors.forename: M
authors.initials: M
authors.lastname: Horvatić
authors.forename: C
authors.initials: C
authors.lastname: Berthier
authors.forename: M
authors.initials: M
authors.lastname: Shayegan
authors.forename: L P
authors.initials: LP
authors.lastname: Lévy