Abstract
The harmonic oscillator is one of the most important systems of physics. It occurs almost everywhere where vibration is found—from the ideal pendulum to quantum field theory. Among other things, the reason is that the parabolic oscillator potential is a good approximation of a general potential V(x), if we consider small oscillations around a stable equilibrium position \(x_{0}\). Thus, in this case we can approximate V(x) by the first terms of the Taylor series:
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Notes
- 1.
These names arise less from the simple harmonic oscillator as we treat it here, but rather from quantum field theory. see Appendix W, Vol. 2. There, one uses the ladder operators to describe the creation and annihilation of photons, phonons, and so on.
Generalized ladder operators may also be defined in general one-dimensional potentials. This leads to supersymmetric quantum mechanics (see, e.g. Schwabl, p. 351ff; Hecht, p. 130, and other relevant literature).
- 2.
In three dimensions, it is \(\hbar \omega \left( n+ \frac{3}{2}\right) \).
- 3.
This is quite similar to the case of the angular momentum.
- 4.
The oscillator length L essentially specifies the positions of the classical turning points; see the exercises.
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Pade, J. (2018). The Harmonic Oscillator. In: Quantum Mechanics for Pedestrians 2. Undergraduate Lecture Notes in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-00467-5_18
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DOI: https://doi.org/10.1007/978-3-030-00467-5_18
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