Phys. Rev. B 63, 121316(R) (2001) [4 pages]Nonquadratic second-harmonic generation from semiconductor-oxide interfaces
Second harmonic generation on Si1-xGex interfaces shows unusual nonmonotonic, nonquadratic behavior. This behavior depends strongly on laser wavelength and surface termination. It is present for oxide-covered samples at second-harmonic wavelengths of 373 nm (3.32 eV), but not at 415 nm (2.99 eV). It is absent at both wavelengths for H-terminated samples. This behavior is consistent with photomodulation of an interfacial electric-field-induced contribution to the second-harmonic response of the system. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.121316
DOI:
10.1103/PhysRevB.63.121316
PACS:
78.66.-w, 42.65.Ky
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