Photoemission Investigation of the 2D Electron Gas Created At the InAs(110) Surface

V. Yu Aristov, G. Le Lay (), P. Soukiassian, V. M. Zhilin, G. M. Grehk, H. J. Kim, R. L. Johnson and C. Giammichele
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V. Yu Aristov: Centre de Recherche sur les Mécanismes de la Croissance Cristalline, CNRS, Campus de Luminy, Case 913, F-13288 Marseille Cedex 09, France
G. Le Lay: Centre de Recherche sur les Mécanismes de la Croissance Cristalline, CNRS, Campus de Luminy, Case 913, F-13288 Marseille Cedex 09, France
P. Soukiassian: Commissariat à l'Energie Atomique, DSM, DRECAM, SRSIM, Bât. 462, Centre d'Etudes de Saclay, F-91191 Gif sur Yvette Cedex, France;
V. M. Zhilin: Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district 142432, Russia
G. M. Grehk: II. Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-2000 Hamburg 52, Germany
H. J. Kim: II. Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-2000 Hamburg 52, Germany
R. L. Johnson: II. Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-2000 Hamburg 52, Germany
C. Giammichele: Istituto di Struttura della Materia del CNR, via E. Fermi 38, I-000444 Prascati, Italy

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 235-240

Abstract: On InAs(110) surfaces a downward band bending (BB) was produced either by cleavage defects or by adsorption of very small amounts of Cs atoms. As a consequence the Fermi level was moved high into the conduction band, resulting in the formation of a two-dimensional electron channel (2D-EC). Electron emission arising from this channel was detected by angle-resolved photoelectron spectroscopy near the$\bar{\Gamma}$points of the first and second surface Brillouin zones. We present a detailed investigation of the corresponding photoemission characteristics using tunable low energy synchrotron radiation light. We find in particular that the photoemission intensity depends drastically on the photon energy. This effect is interpreted as resulting from the quantization of the 2D electron gas in the direction normal to the surface; it is directly linked to the electron density sampled (i.e. the depth probed) beneath the top surface.

Date: 1998
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DOI: 10.1142/S0218625X98000438

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