title: Effective mass suppression in dilute, spin-polarized two-dimensional electron systems.
abstract: We report effective mass (m*) measurements, via analyzing the temperature dependence of the Shubnikov-de Haas oscillations, for dilute, interacting, two-dimensional electron systems (2DESs) occupying a single conduction-band valley in AlAs quantum wells. When the 2DES is partially spin-polarized, m* is larger than its band value, consistent with previous results on various 2DESs. However, as we fully spin-polarize the 2DES by subjecting it to strong parallel magnetic fields, m* is unexpectedly suppressed and falls even below the band mass.
authors.affiliation: Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Medini
authors.initials: M
authors.lastname: Padmanabhan
authors.forename: T
authors.initials: T
authors.lastname: Gokmen
authors.forename: N C
authors.initials: NC
authors.lastname: Bishop
authors.forename: M
authors.initials: M
authors.lastname: Shayegan