title: Observation of magnetically induced effective-mass enhancement of quasi-2D excitons.
abstract: We present the first measurements of the dispersion relation of a quasi-2D magnetoexciton. We demonstrate that the magnetoexciton effective mass is determined by the coupling between the center-of-mass motion and internal structure and becomes overwhelmingly larger than the sum of the electron and hole masses in high magnetic fields.
authors.affiliation: Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: L V
authors.initials: LV
authors.lastname: Butov
authors.forename: C W
authors.initials: CW
authors.lastname: Lai
authors.forename: D S
authors.initials: DS
authors.lastname: Chemla
authors.forename: Y E
authors.initials: YE
authors.lastname: Lozovik
authors.forename: K L
authors.initials: KL
authors.lastname: Campman
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard