Schematic illustration of the Brillouin zone and the band structure of Sb near the Fermi level (Ref. 12). Arrows indicate energetically possible transitions with a 1.55 eV photon.
(a) Isotropic and anisotropic reflectivity changes, and (b) the Fourier transformed (FT) spectra of their oscillatory component, of Sb at 8 K under 30 mW excitation. Pump polarization is parallel to the axis of the crystal. Broken curves in (a) indicate the nonoscillatory component of the reflectivity change due to photoexcitation and relaxation of pairs.
Pump-polarization dependence of and obtained from isotropic reflectivity measurements on the Sb surface with pump power of 30 mW at 8 K. Inset illustrates schematically the surface and the polarizations of the pump and probe. Solid curves represent fitting with with polarization angle .
Oscillatory part of the reflectivity change of Sb at 8 K (open circles), its fit to Eq. (3) (black solid curve), and its and components (blue broken and red dotted curves). The reflectivity change is obtained from isotropic measurements on the (a) and surfaces (b), and from anisotropic measurements on the (c) and surfaces (d). Initial phases obtained by fitting to Eq. (3) are shown in degrees in each panel.
Temperature dependence of (a) the initial amplitudes of coherent and phonons, and (b) the amplitude of the electronic transient, both obtained from isotropic reflectivity measurement on the surface of Sb. Solid curves in (a) and (b) are to guide the eye. Inset in (b) illustrates how to obtain as the maximum height of the nonoscillatory part of the isotropic reflectivity change.
Dephasing rate , frequency , and initial phase of the coherent and phonons of Sb of 8 K, together with the electronic decay rate (see text). The initial phase predicted by Eq. (5) is also listed as . Errors smaller than the last digit are not indicated.
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