Net Charge of Electron-Hole Drops in Pure and Doped Ge

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  • Net Charge of Electron Hole Drops in Pu

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A net charge of drops has been measured with a photocurrent method and a photoluminescence method at 1.5 K in pure and doped Ge. The sign of the net charge obtained from the two methods is in agreement with each other. The sign is negative in pure Ge (ND<1013 cm−3) and p-type Ge (NA=8×1014 cm−3). The sign is positive in n-type Ge (1013 cm−3\lesssimND≤2×1014 cm−3), and the sign cannot be obtained for ND≥8×1014 cm−3 and NA=5×1011 cm−3. The sign reversals are not observed under ⟨111⟩ uniaxial stress (\lesssim103 kg/cm2).

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