Castilho, W. M. [UNESP]Castro, A. S. de [UNESP]2014-12-032014-12-032014-07-01Annals Of Physics. San Diego: Academic Press Inc Elsevier Science, v. 346, p. 164-181, 2014.0003-4916http://hdl.handle.net/11449/113571The scattering of a fermion in the background of a smooth step potential is considered with a general mixing of vector and scalar Lorentz structures with the scalar coupling stronger than or equal to the vector coupling. Charge-conjugation and chiral-conjugation transformations are discussed and it is shown that a finite set of intrinsically relativistic bound-state solutions appears as poles of the transmission amplitude. It is also shown that those bound solutions disappear asymptotically as one approaches the conditions for the realization of the so-called spin and pseudospin symmetries in a four-dimensional space-time. (C) 2014 Elsevier Inc. All rights reserved.164-181engSmooth step potentialSpin symmetryIsolated solutionEffective massArtigo10.1016/j.aop.2014.04.011WOS:000337071800014Acesso restrito5811700083195480