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In/Si(111): Self-Assembled One and Two-Dimensional Electron Gases

Published online by Cambridge University Press:  17 March 2011

Eli Rotenberg
Affiliation:
Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan
H. W. Yeom
Affiliation:
ASSRC & Institute of of Physics and Applied Physics, Yonsei University, 134 Shinchon, Seoul 120-749, Korea
S. Takeda
Affiliation:
Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan
I. Matsuda
Affiliation:
Department of Chemistry, the University of Tokyo, Tokyo 113-0033, Japan
K. Horikoshi
Affiliation:
Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan
J. Schaefer
Affiliation:
Department of Physics, University of Oregon, Eugene, Oregon 97403
C. M. Lee
Affiliation:
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
B. Krenzer
Affiliation:
Department of Physics, University of Oregon, Eugene, Oregon 97403
M. Rocha
Affiliation:
Department of Physics, University of Oregon, Eugene, Oregon 97403
S. D. Kevan
Affiliation:
Department of Physics, University of Oregon, Eugene, Oregon 97403
T. Ohta
Affiliation:
Department of Chemistry, the University of Tokyo, Tokyo 113-0033, Japan
T. Nagao
Affiliation:
Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan CREST, the Japan Science and Technology Corporation, Saitama 332-001, Japan
S. Hasegawa
Affiliation:
Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan CREST, the Japan Science and Technology Corporation, Saitama 332-001, Japan
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Abstract

We present angle-resolved photoemission measurements for ultrathin In films on Si(111). Depending on the coverage, this system self-organizes into a metallic monolayer with either 4×1 or √7×√3 symmetry relative to the substrate. Electronically, they behave like ideal one- and two-dimensional electron gases (1DEG and 2DEG), respectively. The 4×1 system has atomic chains of In whose energy bands disperse only parallel to the chains, while for the √7×√3 system, the dominant reciprocal space features (in both diffraction and bandstructure) resemble a pseudo-square lattice with only weaker secondary features relating to the √7×√3 periodicity. In both materials the electrons show coupling to the structure. The 1DEG couples strongly to phonons of momentum 2kF, leading to an 8ד2” Peierls-like insulating ground state. The 2DEG appears to be partially stabilized by electron gap formation at the √7×√3 zone boundary.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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References

1. Rotenberg, E., Yeom, H. W., Schaefer, J. H., Krenzer, B., Rocha, M., and Kevan, S. D., to be published.Google Scholar
2. Kraft, J., Surnev, S. L., and Netzer, F. P., Surface Science 340, 36 (1995).Google Scholar
3. Chen, Yufeng and Hove, M. A. v., http://electron.lbl.gov/mscdpack.Google Scholar
4. Yeom, H. W., Takeda, S., Rotenberg, E., Matsuda, I., Horikoshi, K., Schaefer, J., Lee, C. M., Kevan, S. D., Ohta, T., Nagao, T., and Hasegawa, S., Phys. Rev. Lett. 82, 4898 (1999).Google Scholar
5. Lifshits, V. G., Surface Phases on Silicon: Preparation, Structure, and Properties (Wiley, Chicchester, 1994).Google Scholar
6. Nogami, J., Park, S. I., and Quate, C. F., Phys. Rev. B 36, 6221 (1987).Google Scholar
7. Saranin, A. A., Zotov, A.V., Ignatovich, K. V., Lifshits, V. G., Numata, T., Kubo, O., Tani, H., Katayama, M., and Oura, K., Phys. Rev. B 56, 1017 (1997).Google Scholar
8. Abukawa, T., Hisamatsu, F., Nakamura, M., Kono, S., Goto, T., Sasaki, M., Kinoshita, T. and Kakizaki, A., J. Electron Spectrosc. Relat. Phenom. 80, 233 (1996).Google Scholar
9. Collazo-Davila, C., Marks, L. D., Nishii, K., Tanishiro, Y., Surf. Rev. Lett. 4, 65 (1997).Google Scholar
10. Hill, I. G. and McLean, A. B., Phys. Rev. B 56, 15725 (1997); 59, 979 (1999).Google Scholar
11. Abukawa, T., Sasaki, M., Hisamatsu, F., Goto, T., Kinoshita, T., Kakizaki, A., Kono, S., Surf. Sci. 325, 33 (1995).Google Scholar
12. Bunk, O., Falkenberg, G., Zeysing, J. H., Lottermoser, L., Johnson, R. L., Nielsen, M., Berg-Rasmussen, F., Baker, J., and Feidenhans'l, R., Phys. Rev. B 59, 12228 (1999).Google Scholar
13. Grüner, G., Density Waves in Solids, (Addison Wesley, 1994).Google Scholar
14. Sakamoto, K., Ashima, H., Yeom, H. W., and Uchida, W., Phys. Rev. B 62, 9923 (2000).Google Scholar