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GaAs is zinc-blende with a = 0.56 nm, ε = 12.8, me* = 0.067me, and mh*...

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Chemistry

GaAs is zinc-blende with a = 0.56 nm, ε = 12.8, me* = 0.067me,and mh* = 0.2me.

(a) What is the exciton binding energy and radius?
(b) How many unit cells are contained within the n = 1orbital?
(c) What is the highest temperature at which ground-state excitonsare still observable?

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