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|Type:||Artigo de periódico|
|Title:||CONFINEMENT AND ZONE FOLDING IN THE E(1)-LIKE OPTICAL-TRANSITIONS OF GE/SI QUANTUM-WELLS AND SUPERLATTICES|
|Abstract:||We report low-temperature (77 K) electroreflectance and photoreflectance measurements of the E(1)-like optical transitions on a series of Ge/Si heterostructures (superlattices and quantum wells). For single and double quantum wells of any thickness, as well as for thick-layer superlattices (period similar to 100 Angstrom) the spectra can be understood in terms of quantum-confined bulk-Ge E(1) states. For thin (similar to 10 Angstrom) multiple quantum wells and superlattices, zone-folding effects dominate the spectra. Actual confinement of the electronic states is determined by measuring the Raman spectrum of each sample in and out of resonance with a given transition.|
|Editor:||American Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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