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Insulating Cs Overlayer on InSb(110)



L Whitman, Joseph A. Stroscio, Robert A. Dragoset, Robert Celotta


Cesium overlayers on room-temperature InSb(110) have been studied with scanning tunneling microscopy and spectroscopy. A two-dimensional (2D) overlayer is observed, consisting of four-atom, Cs(110)-like planar clusters arranged in a c(2 x 6) superlattice. Interestingly, current-versus-voltage (I-V) spectra exhibit a band gap of asymp} 0.6 eV, larger than the substrate band gap of asymp} 0.15 eV. The I-V spectra are very similar to those observed on the similar 2D overlayer on GaAs (110), suggesting that the measured gap is a property of the 2D Cs film. The possible origins of this insulating behavior are discussed.
Physical Review B (Condensed Matter and Materials Physics)


Whitman, L. , Stroscio, J. , Dragoset, R. and Celotta, R. (1991), Insulating Cs Overlayer on InSb(110), Physical Review B (Condensed Matter and Materials Physics) (Accessed December 11, 2023)
Created December 31, 1990, Updated October 12, 2021