Tunneling in a Periodic Array of Semimagnetic Quantum Dots. (Reannouncement withNew Availability Information)

摘要

Magnetopolaron effects in bulk semimagnetic semiconductors such as Cd(1-y)Mn(y)Teand quantum wells are well documented. Magnetopolarons are free carriers dressed by the induced magnetic polarization field of the magnetic ions. Polaronic effects are weak in three dimensions and can only be observed with carriers bound to impurities. In quantum wells their stability is marginal. In one-dimensional systems these polaronic effects should be strong and lead to localized, soliton like states.' The strength of polaronic effects should increase dramatically in quantum dots. We consider here an array of coupled quantum dots as a model of a periodic nonlinear system. Such a system can be realized in a quantum wire with a strongly varying concentration of magnetic ions.