Second-harmonic spectroscopy of interband excitations at the interfaces of strained (formula presented) heterostructures

Physical Review B - Condensed Matter and Materials Physics

Volumn 59, Issue 4, 1999, Pages 2915-2926

  Erley, G ^a   Butz, R ^a   Daum, W ^a  

^a FORSCHUNGSZENTRUM JÜLICH   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001145086     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.59.2915     Document Type: Article

References (36)

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29. The (Formula presented) energy of relaxed (Formula presented) is 3.18 eV (Ref. 3). From the spin-orbit-splitting, the deformation potentials, and the elastic constants, one calculates a stress-induced blueshift of about 10 meV for the (Formula presented) energy of strained (Formula presented) layers (Ref. 11).
30. We note that the energy of this interband resonance was actually not obtained from the fits but was kept fixed at a value of 4.40 eV. Because of the weak contribution of this resonance to the spectra, a free fit shifted its energy to an unrealistically large value without improving the quality of the fit. A reduction of this energy towards the bulk (Formula presented) energy of 4.27 eV clearly worsened the fits. In our investigations of various (Formula presented) interfaces (Refs. 8 and 11), we found the energy of this resonance to lie between 4.34 and 4.45 eV. Correspondingly, we give an error margin of (Formula presented) eV for the energy of this resonance.
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