Peer-reviewed publications

2008

20. "Optical absorption spectra of doped and codoped Si nanocrystallites",

L.E. Ramos, E. Degoli, G. Cantelle, S. Ossicini, D. Ninno, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 78, 235310 (2008).
[abstract][postscript][pdf]

19. "Optical spectra of Si nanocrystallites: Bethe-Salpeter approach versus time-dependent density-functional theory",
L.E. Ramos, J. Paier, G. Kresse, and F. Bechstedt,
Phys. Rev. B 78, 195423 (2008).
[abstract][postscript][pdf]

2007

18. "Structural features and electronic properties of group-III, group-IV, and group-V doped Si nanocrystallites",

L.E. Ramos, E. Degoli, G. Cantelle, S. Ossicini, D. Ninno, J. Furthmüller, and F. Bechstedt,
J.Phys. C: Condens. Matt. 19, 466211 (2007).
[abstract][postscript][pdf]

17. "Theoretical study of the chemical gap tuning in silicon nanowires",
B. Aradi, L.E. Ramos, P. Deák, Th. Köhler, F. Bechstedt, R.Q. Zhang, and Th. Frauenheim,
Phys. Rev. B 76, 035305 (2007).
[abstract][postscript][pdf]

2006

16. "Highly luminescent nanocrystal quantum dots fabricated by lattice-type mismatched epitaxy",
W. Heiss, E. Kaufmann, M. Boeberl, T. Schwarzl, G. Springholz, G. Hesser, F. Schaeffler, K. Koike, H. Harada, M. Yano, R. Leitsmann, L.E. Ramos, F. Bechstedt,
Physica E 35, 241 (2006),
[abstract][postscript][pdf]

15. "Rebonding at coherent interfaces between rocksalt-PbTe/zinc-blende-CdTe",
R. Leitsmann, L.E. Ramos, F. Bechstedt, H. Groiss, F. Schäffler, W. Heiss, Kazuto Koike, Hirashi Harada, and Mitsuaki Yano,
New Journal of Physics 8, 317 (2006).
[abstract][postscript][pdf]

14. "Structural properties of PbTe/CdTe interfaces from first principles",
R. Leitsmann, L.E. Ramos, and F. Bechstedt,
Phys. Rev. B 74, 085309 (2006).
[abstract][postscript][pdf]

2005

13. "Optical properties of Si and Ge nanocrystals: Parameter-free calculations",
L.E. Ramos, H.-Ch. Weissker, F. Bechstedt, and J. Furthmüller,
phys. stat. sol. (b) 242, 3053 (2005).
Editor's choice for the cover of the issue
[abstract][postscript][pdf]

12. "Influence of Oxygen on Optical Properties of Si Nanocrystallites",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Appl. Phys. Lett. 87, 143113 (2005).
[abstract][postscript][pdf]

11. "Quantum confinement in Si- and Ge-capped nanocrystallites",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 72, 045351 (2005).
[abstract][postscript][pdf]

10. "Reduced influence of defects on oxidized Si nanocrystallites",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 71, 035328 (2005).
[abstract][postscript][pdf]

2004

9. "Effect of backbond oxidation on silicon nanocrystallites",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 70, 033311 (2004).
[abstract][postscript][pdf]

8. "Quasiparticle band structures and optical spectra of beta-cristobalite SiO₂",
L.E. Ramos, J. Furthmüller, and F. Bechstedt,
Phys. Rev. B 69, 085102 (2004).
[abstract][postscript][pdf]

2003

7. "Group-IV and group-V substitutional impurities in cubic group-III nitrides",
L.E. Ramos, J. Furthmüller, J.R. Leite, L.M.R. Scolfaro, and F. Bechstedt,
Phys. Rev. B 68, 085209 (2003).
[abstract][postscript][pdf]

2002

6. "Substitutional carbon in group-III nitrides: ab initio description of shallow and deep levels",
L.E. Ramos, J. Furthmüller, L.M.R. Scolfaro, J.R. Leite, and F. Bechstedt,
Phys. Rev. B 66, 075209 (2002).
[abstract][postscript][pdf]

5. "Carbon-based defects in GaN: doping behaviour",
L.E. Ramos, J. Furthmüller, J.R. Leite, L.M.R. Scolfaro, and F. Bechstedt,
phys. stat. sol. (b) 234, 864 (2002).
[abstract][postscript][pdf]

2001

4. "Structural, electronic, and effective-mass properties of silicon and zinc-blende group-III nitride semiconductor compounds",
L.E. Ramos, L.K. Teles, L.M.R. Scolfaro, J.L.P. Castineira, A.L. Rosa, and J.R. Leite,
Phys. Rev. B 63, 165210 (2001).
[abstract][postscript][pdf]

3. "Ab initio theory of native defects in alloys: application to charged N vacancies in Al_x Ga_1-xN alloys",
L.E. Ramos, J. Furthmüller, F. Bechstedt, L.M.R. Scolfaro, and J.R. Leite,
J. Phys. C: Condens. Matt. 14, 2577 (2001).
[abstract][postscript][pdf]

1997-2000

2. "Relaxation effects on the negatively charged Mg impurity in zincblende GaN",
L.K. Teles, L.M.R. Scolfaro, J.R. Leite, L.E. Ramos, A. Tabata, J.L.P. Castineira, and D.J. As,
phys. stat. sol. (b) 216, 541 (1999).
[abstract][postscript][pdf]

1. "Minibands of p-type delta-doping superlattices in GaAs",
L.E. Ramos, G.M. Sipahi, L.M.R. Scolfaro, R. Enderlein, and J.R. Leite ,
Superlattices and Microstructures 22, 443 (1997).
[abstract][postscript][pdf]

Last update 22.12.2008