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It is known that in two-dimensional relativistic Dirac systems placed inorthogonal uniform magnetic and electric fields, the Landau levels collapse asthe applied in-plane electric field reaches a critical value $\pm E_c$. Westudy this phenomenon for a distinct field configuration with in-plane constantradial electric field. The Dirac equation for this configuration does not allowanalytical solutions in terms of known special functions. The results areobtained by using both the WKB approximation and the exact diagonalization andshooting methods. It is shown that the collapse occurs for positive values ofthe total angular momentum quantum number, the hole (electron)-like Landaulevels collapse as the electric field reaches the value $ +(-) E_c/2$. Theinvestigation of the Landau level collapse in the case of gapped graphene showsa number of distinctive features in comparison with the gapless case.

Landau level collapse in graphene in the presence of in-plane radial electric and perpendicular magnetic fields