Dependence of hole effective mass on nitrogen concentration in W-type strained InAs(N)/GaSb/InAs(N) quantum well lasersS. Ridene, M. Debbichi, M. Saïd and H. BouchrihaEur. Phys. J. B, 85 1 (2012) 39DOI: https://doi.org/10.1140/epjb/e2011-20482-5