Collective Excitations in Ultrathin Magnesium Films on Silicon
ORAL
Abstract
We present a systematic study of plasmon excitation in ultrathin Mg overlayer on Si(111) substrate. Our numerical results qualitatively reproduce the experimentally observed plasmon spectra of the Mg/Si systems [1]. The underlying physics of the formation of various absorption peaks can be understood using the simple hybridization concept. Based on this concept, the coexistence of surface and bulk plasmons in the experimental observation turns out to be a clear evidence for the existence of multiple surface plasmons due to the quantum confinement in Mg thin films [2]. In addition, we clearly see the plasmon enhanced substrate absorption, which comes from the screening of the substrate to the oscillatory charges.\\[4pt] [1] Ao Teng et al.(to be published).\\[0pt] [2] Xiaoguang Li et al.(to be published).
*Supported by NNSF of China, USNSF, DMSE/BES of USDOE.
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Authors
Xiaoguang Li
Fudan Univ., Shanghai, China, U of Tennessee, Univ. of Sci. \& Tech. of China
Fudan Univerisity, Shanghai, China, U of Tennessee, U of Sci. \& Tech. of China
Di Xiao
Oak Ridge National Laboratory
Oak Ridge National Lab
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Jian Shen
Fudan University
Fudan Univerisity, Shanghai, China
Department of Physics, Fudan University, Shanghai, China and Department of Physics and Astronomy, The University of Tennessee
University of Tennessee
Hanno Weitering
Department of Physics and Astronomy, The University of Tennessee
U of Tennessee, Oak Ridge National Laboratory
Zhenyu Zhang
University of Science and Technology of China
University of Science and Technology of China, Harvard University, University of Texas at Austin
Department of Physics and Astronomy, University of Tennessee; ICQD, University of Science and Technology of China, Hefei, Anhui, China
