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arXiv 1504.08155quant-phmath-phmath.MP
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含位置依赖质量的有效哈密顿量与序问题

Effective Hamiltonian with position dependent mass and ordering problem

V. M. Tkachuk, O. Voznyak

摘要:

我们导出了跳跃积分沿链缓慢变化的紧束缚模型的有效低能哈密顿量。有效哈密顿量包含与位置相关的质量的动能和有效势能,该动能与跳跃积分成反比。动能序的改变导致有效势能的改变,从而使哈密顿量保持不变。因此,我们可以在不改变哈密顿量的情况下,在动能中选择任意的von Roos序参量。此外,我们提出了一个更一般的形式的动能比冯鲁斯,这仍然与有效势能代表相同的哈密顿量。

英文摘要:

We derive the effective low energy Hamiltonian for the tight-binding model with the hopping integral slowly varying along the chain. The effective Hamiltonian contains the kinetic energy with position dependent mass, which is inverse to the hopping integral, and effective potential energy. Changing of ordering in the kinetic energy leads to change of the effective potential energy and leaves the Hamiltonian the same one. Therefore, we can choose arbitrary von Roos ordering parameters in the kinetic energy without changing the Hamiltonian. Moreover, we propose a more general form for the kinetic energy than that of von Roos, which nevertheless together with the effective potential energy represent the same Hamiltonian.

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