Algebraic solutions of shape-invariant position-dependent effective mass systems

Abstract

Keeping in view the ordering ambiguity that arises due to the presence of position-dependent effective mass in the kinetic energy term of the Hamiltonian, a general scheme for obtaining algebraic solutions of quantum mechanical systems with position-dependent effective mass is discussed. We quantize the Hamiltonian of the pertaining system by using symmetric ordering of the operators concerning momentum and the spatially varying mass, initially proposed by von Roos and Levy-Leblond. The algebraic method, used to obtain the solutions, is based on the concepts of supersymmetric quantum mechanics and shape invariance. In order to exemplify the general formalism a class of non-linear oscillators has been considered. This class includes the particular example of a one-dimensional oscillator with different position-dependent effective mass profiles. Explicit expressions for the eigenenergies and eigenfunctions in terms of generalized Hermite polynomials are presented. Moreover, properties of these modified Hermite polynomials, like existence of generating function and recurrence relations among the polynomials have also been studied. Furthermore, it has been shown that in the harmonic limit, all the results for the linear harmonic oscillator are recovered.

27 pages, 2 figures, to appear in Journal of Mathematical Physics

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• Supersymmetric quantum mechanics and coherent states for a deformed oscillator with position-dependent effective mass
• Exact solution and coherent states of an asymmetric oscillator with position-dependent mass
• Coordinate representation for non Hermitian position and momentum operators
• Hilbert space representation of maximal length and minimal momentum uncertainties