Abstract
We present a tight-binding approach of the soliton formations and propagations in superlattices. Negative differential conductivity in superlattices leads to the growth of the inevitable spatial fluctuations and formation of the electron accumulation-layer domain. Based on the negative differential conductivity, it is shown that the envelope of the tight-binding-approach wave functions is governed by the nonlinear Schrödinger equation which has soliton solutions, the result of which suggests soliton formations and propagations in the superlattices.
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