A particle physicist who authored a worked treatment of the Klein paradox for a spin-zero particle. Solving the Klein-Gordon equation at an electrostatic step requires tracking the sign of the charge current, rather than interpreting every transmitted amplitude as an ordinary positive-energy particle. The example connects boundary matching to the appearance of antiparticle and pair-creation interpretations in relativistic quantum theory.[ref]
Klein Paradox for Spin-0 Particles by Douglas M. Gingrich. Equations (4.137)–(4.155) and discussion of signed transmitted current
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