On the connection between bound and scattering states of finite square-well potentials: a unified approach. (26th January 2021)

• Record Type: Journal Article
• Authors: Morrison, Ian; Ekey, Robert; Biaggio, Ivan; Mitchell, Brandon
• Is Part Of: European journal of physics. Volume 42:Number 2(2021)
• Publication Date: 2021-01-26
• Subjects: transfer matrices -- 1D potentials -- undergraduate quantum mechanics -- transmission coefficient; Physics -- Periodicals; Physics -- Study and teaching (Higher) -- Europe -- Periodicals; 530
• DOI: 10.1088/1361-6404/abcc40
• Languages: English
• ISSNs: 0143-0807

Abstract

Abstract: We discuss a general description of the solutions to the 1D time-independent Schrödinger equation that does not a priori distinguish between scattering states and bound states and emphasizes and reinforces their relationship and connection to each other. This manuscript also introduces the concept of transfer matrices, which it presents as a logical extension of the traditional approach to evaluating 1D potentials. Using the transfer matrix method and a finite step approximation allows for a simple and straight-forward numerical solution of arbitrary 1D potentials. It also separates the process of solving the Schrödinger equation from selecting physically relevant solutions, which is a critical skill in quantum mechanics and is at the core of physics problems in general.