Skip to main content Accessibility help

Metastable Structural Surface Excitations and Concerted ad Atom Motions: A Stm Study of Atomic Motions Within a Semiconductor Surface

  • Jene Golovchenko (a1), Ing-Shouh Hwang (a1), Eric Ganz (a2) and Silva K. Theiss (a1)


Knowledge about atomic scale motions is essential to the understanding of dynamical phenomena on surfaces, such as diffusion, phase transitions, and epitaxial growth. We demonstrate that the addition of a very small number of Pb atoms to a Ge(111) surface reduces the energy barrier for activated processes, thus allowing one to observe concerted atomic motions and metastable structures on this surface near room temperature using a tunneling microscope. The activation energy for surface diffusion of isolated substitutional Pb atoms in Ge(111)-c(2×8) was measured by observing individual atomic interchanges from 24°C to 79°C. We also observed the formation and annihilation of metastable structural surface excitations, which are associated with large numbers of germanium surface atoms in one row of the c(2×8) reconstruction shifting along that row like beads on an abacus. The effect provides a new mechanism for atomic transport on semiconductor surfaces and can explain a number of other observed phenomena associated with Ge(111) surfaces, including the surface diffusion of Pb atoms.



Hide All
1. Ehrlich, G. and Hudda, F.G., J. Chem. Phys. 44, 1039 (1966);
Ehrlich, G., J. Chem. Phys. 44, 1050 (1966);
Kellogg, G.L., Tsong, T.T., and Cowan, P., Surf. Sci. 70, 485 (1978);
Tsong, T., Rep. Prog. Phys. 51, 759 (1988);
Kellogg, G.L. and Feibelman, P.J., Phys. Rev. Lett. 64, 3143 (1990);
Kellogg, G.L., Phys. Rev. Lett. 67, 216 (1991);
Tsong, T.T. and Chen, C., Phys. Rev. B 43, 2007 (1991).
2. Lagally, M.G., Mo, Y.-W., Kariotis, R., Swartzentruber, B.S., and Webb, M.B., in Kinetics of Ordering and Growth at Surfaces edited by Lagally, M.G. (Plenum, New York, 1990) p. 145;
Elswijk, H. B., Hoeven, A.J., van Loenen, E.J., and Dijkamp, D., J. Vac. Sci. Tech. B 9, 451 (1991);
Feenstra, R.M. and Lutz, M. A., Surf. Sci. 243, 151 (1991);
Mo, Y.-W., Kleiner, J., Webb, M.B., and Lagally, M.G., Phys. Rev. Lett. 66, 1998 (1991).
3. Kitamura, S., Sato, T., and Iwatsuki, M., Nature 351, 215 (1991).
4. Feenstra, R. M., Slavin, A.J., Held, G.A., and Lutz, M.A., Phys Rev. Lett. 66, 3257 (1991).
5. Ganz, E., Theiss, S.K., Hwang, I.-S., Golovchenko, J., Phys. Rev. Lett. 68, 1567 (1992).
6. Hwang, I.-S. and Golovchenko, J., Science 258, 1119 (1992).
7. Kaxiras, E. (private communication).
8. Pandey, K.C., Phys Rev. Lett. 57, 2287 (1986);
Pandey, K.C. and Kaxiras, E., Phys. Rev. Lett. 66, 915 (1991).


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