The external potential has many forms, such as harmonic oscillatorpotential, optical lattice potential, elliptic function potential, double well potential, and so on.
外势有许多形式：简谐外势、光晶格外势、椭圆函数外势、双阱外势以及含时线性外势等等。
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Using the periodic orbit theory, we computed the quantum level density of a particle in the two-dimensional harmonic oscillatorpotential with and without the magnetic flux line for different cases.
In terms of SU (1, 1) algebra, the eigen equations of three-dimensional Harmonic Oscillator and hydrogen atom in inverse square potential are counterchanged the same equations in form.