FINITE PERIODIC AND QUASI-PERIODIC SYSTEMS IN AN ELECTRIC-FIELD

We study several properties of Fibonacci and Thue-Morse sequences of s quare well potentials in the presence of an applied electric field and compare them with the results for periodic systems. We obtain integra ted densities of states and show that Wannier-Stark ladders appear in all cases. We analyze the fractal properties and the energy level spac ing distributions and show that the effect of the electric field is to make more regular the quasiperiodic systems. Finally, we obtain the w avefunctions of these systems.