Tigh-Binding approach for disordered system

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Iron_Man
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Hello everyone,

I am interested in Tigh-Binding calculation of energy dispersion for non-crystalline material. I am familiar with usual tight-binding approach for periodic structure, but I don’t understand how to use it in case of disordered system, For example cluster (or quantum dot) with 2-3 atoms of carbons bonded together by sp2 orbitals.

Any idea?
 

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Maybe you have a look at a book on quantum chemistry. There, the tight binding approach is known as "Extended Hueckel approximation".