Skip to main content Accessibility help

Stark Effects on Band Gap and Surface Phonons of Semiconductor Quantum Dots in Dielectric Hosts

  • R. Mu (a1), A. Ueda (a1), Y -S. Tung (a1), D. O. Henderson (a1), Jane G. Zhu (a2), John D. Budai (a2) and W. C. White (a2)...


We have investigated quantum-confined Stark effect (QCSE) on GaAs and CdSe nanocrystals and the electric field effect on surface phonons of GaAs nanocrystals isolated in sapphire substrates. For a strongly quantum-confined system, GaAs quantum dots illustrated no exciton energy shift. When the excitons are weakly confined in CdSe, a ∼ 2 meV red-shift was observed. On the other hand, the results of the electric field effect on surface phonon are dramatic both phonon oscilator strength and freqnency. As the strength of the electric field increases, the total intensity of the surface phonon decreases. At the same time, an additional peak was also observed at 277 cm-1, which is about 3 cm-1 above the center frequency of the surface phonon mode of GaAs nanocrystals embedded in a sapphire host.



Hide All
1. For example, Wang, Y. and Nerron, N., J. Phys. Chem. 91, 5005 (1987); O. I. Micic, Z.Li, G. Mills, J. C.Sullivan, and D.Meisel, J. Chem. Phys. 91, 6221 (1987); ibid J. Phys. Chem. 98, 4966 (1994); D. O. Henderson, R.Mu, A.Ueda, A.Burger, K. T.Chen, and D. O. Frazier, Mat. Res. Soc. Proc. 366, 283 (1995); M.Fuji, S.Hayashi and K.Yamakoto, Appl. Phys. Lett 57, 2692 (1990).
2. White, C. W., Budai, J. D., Zhu, J. G., Withrow, S. P., Hembree, D. M., Jr., Magruder, R. H. and Henderson, D. O., Mat. Res. Soc. Symp. Proc. 358, 175 (1995); C. W.White, J. D.Budai, J. G. Zhu, S. P.Withrow, D. M.Hembree, Jr., D. O. Henderson, A.Ueda, Y. S.Tung, R.Mu and R. H. Magruder, J. Appl. Phys. (under review); R.Mu, D. O. Henderson, Y. S.Tung, A.Ueda, C. W. White, Jane G.Zhu, JVST B (under review).
3. Budai, J. D., White, C. W., Withrow, S. P., Zhu, J. G., Ion-Solid Interactions for Materials Modification and Processing (Mat. Res. Soc. Symp. fall 1995).
4. Jaziri, S., Solid State Commun. 91, 171 (1994).
5. Dissanayake, A. S., Lin, J. Y., and Jiang, H. X., Phys. Rev. B 51, 5457 (1995).
6. Woggon, U., Bogdanov, S. V., Wind, O., Schlaad, K. -H., Pier, H., Klingshirn, C. K., Chatziagorastou, P. and Fritz, H. P., Phys. Rev. B 48, 11979 (1993).
7. Chiba, Y. and Ohnishi, S., Phys. Rev. B 38, 12988 (1988).
8. Bunget, I. and Popescu, M., Physics of Solid Dielectrics, Chap. 1, pp 15 (Elsevier, 1984).
9. For Example, Miller, D. A. B. in Confined Electrons and Photons edited by Burstein, E. and Weisburch, C., p 675701 (Nano Series Vol.340, Plenum Press, New York and London, 1995) (and references therein).
10. Ruppin, R., Electromagnetic Surface Modes edited by Boardman, A. D., chap. 9, p 345398 (John Wiley & Sons Ltd., 1982); R.Ruppin and R.Englman, Rep. Prog. Phys. 33, 149 (1970); S. Hayashi, Jpn. J. Appl. Phys. 23, 665 (1984).
11. Blakemore, J. S., J. Appl. Phys. 53, R123 (1982).


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed