Publications by authors named "Alexander Toropov"
Article Synopsis
- * It identifies that surface pits, ranging in size and depth, are influenced by factors such as substrate annealing temperature and the alloy composition of InAlAs.
- * A model is proposed linking the formation of these surface pits and composition clusters to local strain fields near threading dislocations affecting the incorporation of In adatoms during growth.
Article Synopsis
- Heterostructures featuring high-mobility two-dimensional electron gas were formed into freestanding helical Hall bars for testing.
- Magnetotransport measurements showed significant results, such as minima in the longitudinal magnetoresistance linked to both integer and fractional filling factors under high magnetic fields.
- An observed asymmetry in magnetoresistance depending on magnetic field direction led to an analysis using an edge state model and Landauer-Büttiker calculations.
We present a comparative analysis of Raman scattering by acoustic and optical phonons in InAs/AlAs quantum dot superlattices grown on (001) and (311)B GaAs surfaces. Doublets of folded longitudinal acoustic phonons up to the fifth order were observed in the Raman spectra of (001)- and (311)B-oriented quantum dot superlattices measured in polarized scattering geometries. The energy positions of the folded acoustic phonons are well described by the elastic continuum model.
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