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We present a general proof that Dirac particles cannot be localized belowtheir Compton length by symmetric but otherwise arbitrary scalar potentials.This proof does not invoke the Heisenberg uncertainty relation and thus doesnot rely on the nonrelativistic linear momentum relation. Further it is arguedthat the result is also applicable for more general potentials, as e.g.generated by nonlinear interactions. Finally a possible realisation of such asystem is proposed.

Confinement limit of Dirac particles in scalar 1D potentials