2002/05/15 by N. Freytag, Freytag, N., M. Horvatić +7
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.cond-mat/0205306
openalex publication_date 2002/05/15 · openalex created_date 2020/02/24 · openalex updated_date 2026/07/28
NMR measurements of the electron spin polarization have been performed on a\n2D electron system at and around half-filled lowest Landau level. Comparing the\nmagnetic field and the temperature dependence of the spin polarization to\nmodels of free and interacting composite fermions (CF), we confirm the\nexistence of a Fermi sea and show that residual interactions are important.\nIndependent measurements of the CF effective mass, g-factor and Fermi energy\nare obtained from the thermal activation of the spin polarization in tilted\nfields. The filling factor dependence of the spin polarization for 2/5 < \ν <\n2/3 reveals a broken particle-hole symmetry for the partially polarized CF\nFermi sea.\n