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Title: Relativistic particle in a box: Klein–Gordon versus Dirac equations
Authors: Alberto, Pedro 
Das, Saurya 
Vagenas, Elias C 
Keywords: Relativistic Particle in a Box
Issue Date: Jan-2018
Serial title, monograph or event: European Journal of Physics
Volume: 39
Issue: 2
Abstract: The problem of a particle in a box is probably the simplest problem in quantum mechanics which allows for significant insight into the nature of quantum systems and thus is a cornerstone in the teaching of quantum mechanics. In relativistic quantum mechanics this problem allows also to highlight the implications of special relativity for quantum physics, namely the effect that spin has on the quantised energy spectra. To illustrate this point, we solve the problem of a spin zero relativistic particle in a one- and three-dimensional box using the Klein–Gordon equation in the Feshbach–Villars formalism. We compare the solutions and the energy spectra obtained with the corresponding ones from the Dirac equation for a spin one-half relativistic particle. We note the similarities and differences, in particular the spin effects in the relativistic energy spectrum. As expected, the non-relativistic limit is the same for both kinds of particles, since, for a particle in a box, the spin contribution to the energy is a relativistic effect.
DOI: 10.1088/1361-6404/aa9b43
Rights: openAccess
Appears in Collections:I&D CFis - Artigos em Revistas Internacionais

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