Abstract

A spectroscopic determination of the energy gap E g and the exciton energy E x in highly excited Ge at T = 5–20K is presented. Within 0.05 meV we observe no shift of E g and E x up to electron-hole densities of 10 14−10 15 cm −3. In this range all previous theories predict a sizeable band renormalization ( ΔE g ≈−0.3 meV to − 2 meV).

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