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变形形状不变性和有效质量依赖于位置的精确可解哈密顿量

Deformed shape invariance and exactly solvable Hamiltonians with position-dependent effective mass

B. Bagchi, A. Banerjee, C. Quesne, V. M. Tkachuk

摘要:

将已知的常质量薛定谔方程的形状不变势作为位置相关有效质量(PDEM)方程的有效势。相应的形状不变条件原来是变形的。它的可解性决定了变形超势和PDEM的形式。用这种方法产生了许多新的与PDEM背景相联系的精确可解势。一个新的和重要的条件,限制存在的束缚态时,PDEM消失在一个端点的时间间隔被确定。在某些情况下,束缚态谱的结果从一个平滑的变形,在传统的形状不变的建设中使用的潜力。在另一些情况下,人们观察到束缚态的产生或抑制,这取决于质量参数值。相应的波函数由变形的经典正交多项式表示。

英文摘要:

Known shape-invariant potentials for the constant-mass Schrodinger equation are taken as effective potentials in a position-dependent effective mass (PDEM) one. The corresponding shape-invariance condition turns out to be deformed. Its solvability imposes the form of both the deformed superpotential and the PDEM. A lot of new exactly solvable potentials associated with a PDEM background are generated in this way. A novel and important condition restricting the existence of bound states whenever the PDEM vanishes at an end point of the interval is identified. In some cases, the bound-state spectrum results from a smooth deformation of that of the conventional shape-invariant potential used in the construction. In others, one observes a generation or suppression of bound states, depending on the mass-parameter values. The corresponding wavefunctions are given in terms of some deformed classical orthogonal polynomials.

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