NMR investigation of how free composite fermions are at ν=1/2

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

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NMR investigation of how free composite fermions are at ν=1/2

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Freytag, N.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Horvatić, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Berthier, C.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Freytag, N., Horvatić, M., Berthier, C., Shayegan, M., & Lévy, L. P. (2002). NMR investigation of how free composite fermions are at ν=1/2. Physical Review Letters, 89(24): 246804.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F21B-3

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<ν<2/3 reveals a broken particle-hole
symmetry for the partially polarized CF Fermi sea.