AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS2-TuA

Paper SS2-TuA1
The Plasmons of ErAs (100)

Tuesday, November 4, 2003, 2:00 pm, Room 327

Session: Surfaces and Interfaces of Semiconductors and Compound Materials
Presenter: H.K. Jeong, University of Nebraska, Lincoln
Authors: H.K. Jeong, University of Nebraska, Lincoln
T. Komesu, University of Nebraska, Lincoln
P.A. Dowben, University of Nebraska, Lincoln
B.D. Schultz, University of Minnesota
C.J. Palmstrom, University of Minnesota
Correspondent: Click to Email
Momentum resolved inelastic electron energy loss has been exploited to measure the surface and bulk plasmons of ErAs(100). The effects of the electronic band structure is seen in the weak plasmon dispersion. This is consistent with heavy mass of the states near the Fermi energy in the experimentally determined band structure. The ratio of bulk and surface plasmon energy is roughly . In both Hg@footnote 1@ and ErAs,@footnote 2,3@ there are indications that the surface is significantly less metallic in character than the bulk. The behavior of the surface plasmon is related to the metallicity of the surface,@footnote 1@ so as with mercury thin films,@footnote 4@ the band structure of ErAs@footnote 2@ should strongly influence the surface and bulk plasmons. While there are a number of studies of the plasmons of simple metals, there are only a few studies of plamons in 4f-5d systems, such as those undertaken from Hg thin films.@footnote 4@ @FootnoteText@ @footnote 1@P.A. Dowben, Surface Science Reports 40, 151 (2000) @footnote 2@H.K. Jeong, Takashi Komesu, P.A. Dowben, B.D. Schultz and C.J. Palmstrom, Physics Letters A 302, 217 (2002) @footnote 3@Takashi Komesu, Hae-Kyung Jeong, Jaewu Choi, C.N. Borca, P.A. Dowben, A.G. Petukhov, B.D. Schultz, and C.J. Palmstrom, Physical Review B 67, art. no. 035104 (2003) @footnote 4@B.-O. Kim, G. Lee. E.W. Plummer, P.A. Dowben and A. Liebsch, Phys. Rev. B 52, 6057 (1995) .