title: Electron mass in dilute nitrides and its anomalous dependence on hydrostatic pressure.
abstract: The dependence of the electron mass on hydrostatic pressure P in N-diluted GaAs1-xNx (x=0.10% and 0.21%) is investigated by magnetophotoluminescence. Exceedingly large fluctuations (up to 60%/kbar) in the electron mass with increasing P are found. These originate from a pressure-driven tuning of the hybridization degree between the conduction band minimum and specific nitrogen-related states. Present results suggest a hierarchy between different nitrogen complexes as regards the extent of the perturbation these complexes exert on the electronic properties of the GaAs host.
authors.affiliation: CNISM and Dipartimento di Fisica, Sapienza Università di Roma, P.le A. Moro 2, 00185 Roma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Pettinari
authors.forename: A
authors.initials: A
authors.lastname: Polimeni
authors.forename: F
authors.initials: F
authors.lastname: Masia
authors.forename: R
authors.initials: R
authors.lastname: Trotta
authors.forename: M
authors.initials: M
authors.lastname: Felici
authors.forename: M
authors.initials: M
authors.lastname: Capizzi
authors.forename: T
authors.initials: T
authors.lastname: Niebling
authors.forename: W
authors.initials: W
authors.lastname: Stolz
authors.forename: P J
authors.initials: PJ
authors.lastname: Klar