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In models for amorphous semiconductors, the Hamiltonian can be written as H=  + T̂, where  accounts for the intracluster hopping and satisfies  2 = Â, i.e., it is a projection operator, and T̂ is the operator responsible for the hopping between nearest-neighbor clusters and satisfies T̂2 =I. These properties of  and T̂ endow the spectrum with dispersionless bands.
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In models for amorphous semiconductors, the Hamiltonian can be written as H = A ̂ + T ̂, where A ̂ accounts for the intracluster hopping and satisfies A ̂ 2 = A ̂, i.e., it is a projection operator, and T ̂ is the operator responsible for the hopping between nearest-neighbor clusters and satisfies T ̂ 2 = I. These properties of A ̂ and T ̂ endow the spectrum with dispersionless bands.
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†. This would be a generalization of Straley's result for amorphous semiconductors, where the intracluster hopping satisfies  2 = Â, although we do not have an exact proof.
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†. This would be a generalization of Straley's result for amorphous semiconductors, where the intracluster hopping satisfies A ̂ 2 = A ̂, although we do not have an exact proof.
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