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Phys. Rev. B 72, 085440 (2005) [7 pages]

Evidence against a charge density wave on Bi(111)

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T. K. Kim1, J. Wells1, C. Kirkegaard1, Z. Li1, S. V. Hoffmann1, J. E. Gayone2, I. Fernandez-Torrente3, P. Häberle3, J. I. Pascual3, K. T. Moore4, A. J. Schwartz4, H. He5, J. C. H. Spence5, K. H. Downing6, S. Lazar7, F. D. Tichelaar7, S. V. Borisenko8, M. Knupfer8, and Ph. Hofmann1,*
1Institute for Storage Ring Facilities, University of Aarhus, 8000 Aarhus C, Denmark
2Institute for Storage Ring Facilities, University of Aarhus, 8000 Aarhus C, Denmark and Centro Atomico Bariloche and CONICET, 8400 S.C. de Bariloche, Argentina
3Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin, Germany
4Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
5Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
6Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
7National Center for High Resolution Electron Microscopy, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
8Institute for Solid State Research, IFW-Dresden, P.O. Box 270016, D-01171 Dresden, Germany

Received 26 May 2004; revised 28 March 2005; published 18 August 2005

The Bi(111) surface was studied by scanning tunneling microscopy (STM), transmission electron microscopy (TEM), and angle-resolved photoemission spectroscopy (ARPES) in order to verify the existence of a recently proposed surface charge-density wave (CDW) [ Ch. R. Ast and H. Höchst Phys. Rev. Lett. 90 016403 (2003)]. The STM and TEM results do not support a CDW scenario at low temperatures. Furthermore, the quasiparticle interference pattern observed in STM confirms the spin-orbit split character of the surface states which prevents the formation of a CDW, even in the case of good nesting. The dispersion of the electronic states observed with ARPES agrees well with earlier findings. In particular, the Fermi contour of the electron pocket at the center of the surface Brillouin zone is found to have a hexagonal shape. However, no gap opening or other signatures of a CDW phase transition can be found in the temperature-dependent data.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.085440
DOI:
10.1103/PhysRevB.72.085440
PACS:
79.60.−i, 71.45.Lr, 73.20.−r, 73.25.+i

*Corresponding author. Electronic address: philip@phys.au.dk

 
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