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Analysis of lattice dynamics and magnetic properties of II‐VI layers and interfaces by Raman spectroscopy

Analysis of lattice dynamics and magnetic properties of II‐VI layers and interfaces by Raman spectroscopy

Authors :
U. Bass
J. Geurts
Veit Wagner
M. Lentze
Source :
physica status solidi c. 4:3297-3309
Publication Year :
2007
Publisher :
Wiley, 2007.

Abstract

We report on the lattice dynamics of abrupt and intermixed interfaces of II-VI-layers and quantum dots, studied by Raman spectroscopy from embedded CdSe monolayers in BeTe, and from CdSe quantum dots in ZnSe. It is demonstrated that the best CdSe/BeTe interface quality is achieved, when CdTe interface bonds are applied. The corresponding vibration modes are described very well by density functional calculations, and they also reveal the onset of CdSe quantum dot formation. For these interfaces, the reduced symmetry (i.e. non-equivalence of [011] and [01-1] in-plane axes) is analyzed from the polarization dependent Raman scattering intensity. Similar results are presented for Raman scattering from Te surface dimers on BeTe(100). Furthermore, the (s,p)-d exchange energy of diluted magnetic II-VI semiconductors is studied by spin flip Raman spectroscopy. For n-doped (Zn,Mn)Se, a doping-induced reduction of the exchange energy and enhancement of the spin relaxation time T is demonstrated. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Details

ISSN :
16101642 and 18626351
Volume :
4
Database :
OpenAIRE
Journal :
physica status solidi c
Accession number :
edsair.doi...........60311b9839179153d2d2a7bb6733d5d2
Full Text :
https://doi.org/10.1002/pssc.200775408