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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

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