tailieunhanh - Lowest excited state impurity binding energy in ingan gan parabolic QWW: Magnetic field effect

In this paper, we have investigated the magnetic field effect on the lowest excitedstate binding energy of hydrogenic shallow-donor impurity in wurtzite (In,Ga)N/GaN parabolic transversal-section quantum-well wire (PQWW) using the finite-difference method within the quasione-dimensional effective potential model. The calculations are performed within the framework of the effective mass approximation. | Communications in Physics, Vol. 23, No. 3 (2013), pp. 275-281 LOWEST EXCITED-STATE IMPURITY BINDING ENERGY IN InGaN/GaN PARABOLIC QWW: MAGNETIC FIELD EFFECT HADDOU EL GHAZI LPS, Faculty of sciences, Dhar EL Mehrez, 1796 Atlas Fez, Morocco and Special Mathematics, CPGE Kenitra, Chakib Arsalane Street, Kenitra Morocco ANOUAR JORIO AND IZEDDINE ZORKANI LPS, Faculty of sciences, Dhar EL Mehrez, 1796 Atlas Fez, Morocco Email: hadghazi@ Received 08 August 2013;; revised manuscript received 26 August 2013 Accepted for publication 28 August 2013 Abstract. In this paper, we have investigated the magnetic field effect on the lowest excitedstate binding energy of hydrogenic shallow-donor impurity in wurtzite (In,Ga)N/GaN parabolic transversal-section quantum-well wire (PQWW) using the finite-difference method within the quasione-dimensional effective potential model. The calculations are performed within the framework of the effective mass approximation. A cylindrical QWW effective radius is taken into account to describe the lateral confinement strength. The numerical results show that: (i) the probability density is the largest on a circularity whose radius is the effective radius and (ii) the lowest excited-state binding energy is the largest when an impurity is located on this circularity while it starts to decrease as the impurity is away from the circularity. I. INTRODUCTION In the last few decades, there have been several studies concerning hydrogenic impurities in low-dimensional semiconductors such as quantum well (QW), quantum well wire (QWW) and quantum dot (QD) under external fields which are an interesting probe to study the physical properties both from theoretical and technological points of view [1–19]. Using the potential morphing method within the effective mass approximation, Baskoutas et al. [20–23] have investigated the effect of external electric and magnetic fields on the binding energy in GaAs-GaAlAs inverse parabolic quantum well .