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Stark ladders in a two-band tight-binding model

The electronic states of a one-dimensional two-band tight-binding model in a uniform electric field, in which the strength of interband coupling is varied, are studied. Eigenenergies, densities of states and wavefunctions are numerically computed for a finite length of the system in order to see the transition from Bloch bands at low electric fields to the eigenstates at high fields explicitly. The results for high electric fields indicate the existence of sets of Stark ladders arising from different bands even when interband coupling is strong.