Cs/GaAs(100) surface: two-dimensional metal or Hubbard insulator?

Authors
Tereshchenko, OE Al'perovich, VL Terekhov, AS Litvinov, AN
Citation
Oe. Tereshchenko et al., Cs/GaAs(100) surface: two-dimensional metal or Hubbard insulator?, JETP LETTER, 70(8), 1999, pp. 550-555
Citations number
16
Categorie Soggetti
Physics
Journal title
JETP LETTERS
ISSN journal
00213640 → ACNP
Volume
70
Issue
8
Year of publication
1999
Pages
550 - 555
Database
ISI
SICI code
0021-3640(19991025)70:8<550:CSTMOH>2.0.ZU;2-6
Abstract
The evolution of the characteristic electron energy loss spectra accompanyi ng the deposition of cesium on GaAs(100) surfaces with various superstructu ral reconstructions is studied experimentally. It is shown that the appeara nce of loss peaks in the GaAs band gap for Cs coverages theta(Cs)> 0.5 mono layers is due to resonances in the longitudinal and transverse polarizabili ty of two-dimensional metallic clusters of adatoms. (C) 1999 American Insti tute of Physics. [S0021-3640(99)01120-2].