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Your search keyword '"Pusep, Yu.A."' showing total 27 results
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27 results on '"Pusep, Yu.A."'

7. Characterization of GaAs wire crystals grown on porous silicon by Raman scattering

Author

Silva, S.W. da, Lubyshev, D.I., Basmaji, P., Pusep, Yu.A., Pizani, P.S., Galzerani, J.C., Katiyar, R.S., and Morell, G.

Subjects
Crystals -- Spectra, Raman effect -- Research, Physics
Abstract

Two excitation radiations were employed in measuring the Raman spectra of porous silicon-grown GaAs wirelike crystals. Redshifted and broadened transverse optic and longitudinal optic vibrational bands were observed. The vibrational band characteristics were found to be caused by a disorder-induced relaxation in Raman activity selection rules. The features are also attributed to penetration depth variations and defect density gradient.

Published
1997

12. Parallel conductivity of random GaAs/AlGaAs superlattices in regime of controlled vertical disorder

Author

Pusep, Yu.A., Chiquito, A.J., Mergulhao, S., and Toropov, A.I.

Subjects
Electrical conductivity -- Research, Aluminum -- Electric properties, Gallium arsenide -- Electric properties, Physics
Abstract

It is a study of the transport properties parallel to the layers in the intentionally disordered doped GAAs/Al GaAs superlattices. It is reported that the mobility decreases with the increase of the disorder.

Published
2002

13. Magnetotransport in a wide parabolic well superimposed with a superlattice.

Author

Pusep, Yu.A., Gusev, G. M., Bakarov, A. K., Toropov, A. I., and Portal, J. C.

Subjects
*SUPERLATTICES, *ALUMINUM, *GALLIUM arsenide, *MAGNETIC fields, *QUANTUM wells
Abstract

The electron properties of artificially disordered superlattices embedded in a wide AlGaAs parabolic well were investigated in a strong magnetic field. We demonstrated that in the extreme quantum limit the interlayer disorder results in formation of a new correlated phase. A nearly uniform electron distribution over the superlattice wells was found in a weak magnetic field. However, a nonuniform phase with partially localized electrons, representing well-developed fractional quantum Hall effect features, was observed in high magnetic field (at the filling factor ν < 1). A distinct magnetic field-induced transition separates these two phases. [ABSTRACT FROM AUTHOR]

Published
2011
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