Influence of nitrogen-cluster states on the gyromagnetic factor of electrons in GaAs1xNx

G. Pettinari, F. Masia, A. Polimeni, M. Felici, A. Frova, M. Capizzi, A. Lindsay, E. P. O’Reilly, P. J. Klar, W. Stolz, G. Bais, M. Piccin, S. Rubini, F. Martelli, and A. Franciosi
Phys. Rev. B 74, 245202 – Published 6 December 2006

Abstract

The effective gyromagnetic factor of electrons, ge*, has been determined by Zeeman splitting measurements in a large number of GaAs1xNxGaAs (x<0.7%) samples. Upon N incorporation, ge* shows first a sign reversal with respect to that of GaAs, then increases abruptly for a nitrogen concentration of order of 0.04%, and finally displays a nonmonotonic dependence on composition for higher x values. This behavior is well reproduced by a modified kp model taking into account a nonmonotonic loss of Γ character of the conduction band minimum due to multiple crossings between the redshifting conduction band edge and N-cluster states.

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  • Received 22 May 2006

DOI:https://doi.org/10.1103/PhysRevB.74.245202

©2006 American Physical Society

Authors & Affiliations

G. Pettinari, F. Masia, A. Polimeni*, M. Felici, A. Frova, and M. Capizzi

  • CNISM and Dipartimento di Fisica, Sapienza Università di Roma, P.le A. Moro 2, 00185 Roma, Italy

A. Lindsay and E. P. O’Reilly

  • Tyndall National Institute, Lee Maltings, Cork, Ireland

P. J. Klar and W. Stolz

  • Department of Physics and Material Sciences Center, Philipps-University, Renthof 5, 35032 Marburg, Germany

G. Bais, M. Piccin, S. Rubini, F. Martelli, and A. Franciosi

  • TASC-CNR, Area Science Park, 34012 Trieste, Italy

  • *Email address: polimeni@roma1.infn.it

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Issue

Vol. 74, Iss. 24 — 15 December 2006

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