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Temperature-dependent THz interferograms of (111) InSb showing bulk plasmon oscillations. Curves are plotted on the same relative scale and displaced vertically for clarity.
Coherent plasmon frequency obtained for two samples with different donor densities . The frequency increases (filled circles) when the intrinsic carrier concentration becomes comparable to the donor density as predicted by the model (solid line). For the second sample (triangles) the doping density exceeds the intrinsic concentration throughout the experimental temperature range and the plasma frequency does not change.
Calculated electron-electron interaction in the conduction band of InSb at 80 K with density of using the Lindhard–Mermin formulation. The plasmon damping rate due to collisions is as determined from the experiment. Fermi–Dirac statistics and nonparabolicity are included (Ref. 17).
Autocorrelation signal for the sample in Fig. 1 at room temperature. The cryostat window is removed to extend the high frequency response. Fourier transform of this signal (inset) shows the emitted radiation is dominated by coherent LO phonon oscillations at 6 THz.
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