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Spectra of first-order and second-order (a) Stokes and (b) anti-Stokes Raman scatterings at different electric fields indicated. is used to designate the photon energy of the incident beam.
Dependences of (a) first-order and (b) second-order Raman scattering signal intensities deduced from Fig. 1 on the photon energy of the incident beam measured relative to the bandgap of GaN. Filled squares and filled circles, Stokes; open squares and open circles, anti-Stokes. All dashed curves correspond to fitting to data. The errors are indicated in the figures.
LO photon temperatures vs electric field, deduced from (a) first-order (filled symbols) and (b) second-order (open symbols) Raman scatterings, as a function of the electric field at three different sets of photon energies for the incident beam: 3.361 and 3.270 eV (filled and open squares), 3.355 and 3.266 eV (filled and open triangles), and 3.316 and 3.225 eV (filled and open circles). Solid curves, dotted curves, and horizontal dashed lines correspond to fitting to data, lattice temperatures, and room temperature (i.e., 295 K), respectively. The errors are indicated in the figures.
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