Electron-Lattice Interaction on <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi><mi>−</mi><mi>Ga</mi><mo>(</mo><mn>010</mn><mo>)</mo></math></span>

Ph. Hofmann; Y. Q. Cai; Ch. Grütter; J. H. Bilgram

doi:10.1103/PhysRevLett.81.1670

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Electron-Lattice Interaction on $α - Ga (010)$

Ph. Hofmann

Y. Q. Cai^*

Ch. Grütter and J. H. Bilgram

Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin-Dahlem, Germany
and Institute for Storage Ring Facilities, University of Aarhus, 8000 Aarhus C, Denmark

Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin-Dahlem, Germany

Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule, 8093 Zürich, Switzerland

^*Present address: Institute for Solid State Physics, University of Tokyo, Tokyo 106, Japan

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Phys. Rev. Lett. 81, 1670 – Published 24 August, 1998

DOI: https://doi.org/10.1103/PhysRevLett.81.1670

Abstract

We have investigated the (010) surface of $α - Ga$ by angle-resolved photoemission and low energy electron diffraction. We find a surface state around the $\bar{C}$ point of the surface Brillouin zone. The electron-phonon coupling at this surface is very strong with an electron-phonon mass enhancement parameter of $λ = 1.4 \pm 0.10$ . Our spectra show high background intensity in a projected bulk band gap which cannot be accounted for by defect scattering and is therefore interpreted as indicating a nonquasiparticle behavior. Upon cooling the sample below 220 K we observe a phase transition accompanied by spectral changes near the Fermi level.

References (13)

R. A. Bartynski, E. Jensen, T. Gustafsson, and E. W. Plummer, Phys. Rev. B 32, 1921 (1985).
Ph. Hofmann, R. Stumpf, V. M. Silkin, E. V. Chulkov, and E. W. Plummer, Surf. Sci. 355, L278 (1996).
M. Bernasconi, G. L. Chiarotti, and E. Tosatti, Phys. Rev. Lett. 70, 3295 (1993); Phys. Rev. B 52, 9999 (1995).
S. Engelsberg and J. R. Schrieffer, Phys. Rev. 131, 993 (1963).
W. B. Waeber, J. Phys. C 2, 903 (1969).
G. Grimvall, The Electron-Phonon Interaction in Metals (North-Holland, New York,1981).
O. Züger and U. Dürig, Phys. Rev. B 46, 7319 (1992).
There exists some confusion as to the labeling of the axis in $α$ -Ga. Our notation is that defined in Landoldt-Börnstein, New Series, Vol. 6, P. Eckerlin and H. Kandler (Springer-Verlag, Heidelberg, New York,1971). It is different from the notation used in Refs. [[3,7]], where our (010) surface is called (001).
S. Lizzit, S. Moré, Ph. Hofmann, A. M. Bradshaw, Ch. Grütter, and J. H. Bilgram (unpublished).
B. A. McDougall, T. Balasubramanian, and E. Jensen, Phys. Rev. B 51, 13 891 (1995).
E. Tosatti, Festkörperprobleme 15, 113 (1975).
E. Tosatti, in Electronic Surface and Interface States on Metallic Systems, E. Bertel and M. Donath (World Scientific, Singapore,1995), and references therein.
W. L. McMillan, Phys. Rev. B 16, 643 (1977).

[c1] R. A. Bartynski, E. Jensen, T. Gustafsson, and E. W. Plummer, Phys. Rev. B 32, 1921 (1985).

[c2] Ph. Hofmann, R. Stumpf, V. M. Silkin, E. V. Chulkov, and E. W. Plummer, Surf. Sci. 355, L278 (1996).

[c3] M. Bernasconi, G. L. Chiarotti, and E. Tosatti, Phys. Rev. Lett. 70, 3295 (1993); Phys. Rev. B 52, 9999 (1995).

[c4] S. Engelsberg and J. R. Schrieffer, Phys. Rev. 131, 993 (1963).

[c5] W. B. Waeber, J. Phys. C 2, 903 (1969).

[c6] G. Grimvall, The Electron-Phonon Interaction in Metals (North-Holland, New York,1981).

[c7] O. Züger and U. Dürig, Phys. Rev. B 46, 7319 (1992).

[c8] There exists some confusion as to the labeling of the axis in $α$ -Ga. Our notation is that defined in Landoldt-Börnstein, New Series, Vol. 6, P. Eckerlin and H. Kandler (Springer-Verlag, Heidelberg, New York,1971). It is different from the notation used in Refs. [[3,7]], where our (010) surface is called (001).

[c9] S. Lizzit, S. Moré, Ph. Hofmann, A. M. Bradshaw, Ch. Grütter, and J. H. Bilgram (unpublished).

[c10] B. A. McDougall, T. Balasubramanian, and E. Jensen, Phys. Rev. B 51, 13 891 (1995).

[c11] E. Tosatti, Festkörperprobleme 15, 113 (1975).

[c12] E. Tosatti, in Electronic Surface and Interface States on Metallic Systems, E. Bertel and M. Donath (World Scientific, Singapore,1995), and references therein.

[c13] W. L. McMillan, Phys. Rev. B 16, 643 (1977).

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Electron-Lattice Interaction on α−Ga(010)

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Electron-Lattice Interaction on $α - Ga (010)$