External electric and magnetic field effects on the optical absorption coefficients and refractive index changes of a hydrogenic impurity confined in a cylindrical quantum wire with convex bottom

In this paper, we have studied the simultaneous effects of external electric and magnetic fields on the optical absorption coefficients and refractive index changes of a hydrogenic impurity confined in a cylindrical quantum wire with convex bottom. Energy eigenvalues and eigenvectors are calculated using the direct matrix diagonalization method and optical properties are obtained using the compact density matrix approach. Our results indicate that, the wire radius, convexity parameter, hydrogenic impurity and external electric and magnetic fields have a great influence on the linear and the third-order nonlinear optical absorption coefficients as well as the refractive index changes of the system. (C) 2013 Elsevier B.V. All rights reserved.