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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
- 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)
- Subjects :
- Condensed matter physics
Chemistry
business.industry
Exchange interaction
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
Cadmium telluride photovoltaics
Condensed Matter::Materials Science
symbols.namesake
Semiconductor
Quantum dot
Monolayer
symbols
Spin-flip
Raman spectroscopy
business
Raman scattering
Subjects
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