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STM Observations of Helium Atoms Adsorbed on Graphite Surfaces (1998)

Mori, N. ; Bäuerle, C. ; Kumakura, T. ; [et al.]

Springer

Journal of low temperature physics 110 (1998), S. 641-646

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ISSN: 1573-7357

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We present preliminary results of real-space imaging of two-dimensional (2D) submonolayer 4He films adsorbed on graphite basal planes using a cryogenic STM. Below 1K, we observed an additional $$\sqrt 3 \times \sqrt 3 $$ atomic corrugation superimposed to the triangular lattice of the B-site carbon atoms of the graphite surface. This superlattice has the same periodicity as the commensurate solid 4He. It disappears on warming from 1 to 2K presumably due to melting of the 2D solid. Furthermore, an energy gap of the order of ± (10 to 30) mV was observed in tunneling spectroscopy measurements associated with the adsorption of 4He.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1022543824422

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