(i) Calculate the exciton Rydberg energy and Bohr radius for GaAs, * = which has r = 12.8, m = 0.067mo and m 0.2mo.
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![Example 4.1
(i) Calculate the exciton Rydberg energy and Bohr radius for GaAs,
which has r= 12.8, m = 0.067mo and m = 0.2mo.
(ii) GaAs has a cubic crystal structure with a unit cell size of 0.56 nm.
Estimate the number of unit cells contained within the orbit of the n = 1
exciton. Hence justify the validity of assuming that the medium can be
treated as a uniform dielectric in deriving eqns 4.1 and 4.2.
(iii) Estimate the highest temperature at which it will be possible to
observe stable excitons in GaAs.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe96de917-4487-44ca-a3a8-823bf17ccbd5%2F7220883c-53a0-49ce-b5a8-ac505f15f004%2Ffl5ble5_processed.jpeg&w=3840&q=75)
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