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Nanowires and 2D modulation doped nanostructures based on tellurides *, **

Tomasz Wojtowicz 

Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland


We will review recent progress in the molecular beam epitaxy of telluride nanostructures achieved in the Institute of Physics. This will cover two areas of nanostructures: nanowires and n-type modulation doped quantum wells.

The growth of ZnTe, ZnMgTe and ZnMnTe nanowires was performed on the GaAs substrates covered with Au nanocatalysts. Raman experiments revealed the shift and splitting of the observed lines which is comparable to that expected for the 3D mixed crystal with composition equal to the composition of NWs estimated based on their lattice constant. The temperature variation of the internal Mn2+ luminescence transition provides strong evidence that Mn2+ ions in our Zn1-xMnxTe NWs are located at tetrahedral lattice sites.

 Careful optimization of the growth procedures and structure design have lead to a significant improvement of the quality of CdTe-based structures containing 2DEG. Low temperature Hall mobility as high as 400 000 cm2/Vs was observed after the illumination. The exceptional quality of nanostructures was also proven by the observation of fractional quantum Hall effect (FQHE) at mK temperatures and high magnetic fields not only in CdTe- but also in Cd1-xMnxTe-QWs, with effective electron g-factor as high as 300. To our knowledge this is the very first observation of FQHE in II-VI semiconductor materials.  

*Work done in collaboration with E. Janik, W. Zaleszczyk, G. Karczewski, P. Dłużewski, S. Kret, W. Szuszkiewicz, E. Dynowska, J. Domagała, M. Aleszkiewicz, L.T. Baczewski, A. Petroutchik, A. Presz, J. F. Morhange, H. Kirmse, W. Neumann, W. Caliebe, M. Wiater, V. Kolkovski, T. Wojciechowski, C. Betthausen, A. Voge, W. Wegscheider, D. Weiss, J. Kunc and M. Potemski.

** The research was partially supported by the European Union within European Regional Development Fund, through grant Innovative Economy (POIG.01.01.02-00-008/08), by the MNiSW (Poland) through grant  N515 015 32/0997, and by the Foundation for Polish Science through subsidy 12/2007.

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Presentation: Invited oral at E-MRS Fall Meeting 2009, Symposium C, by Tomasz Wojtowicz
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-19 17:11
Revised:   2009-06-07 00:48