SURFACE PHONONS OF LIBR/SI(100) EPITAXIAL LAYERS BY HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY

被引:13
作者
GAO, W
FUJIKAWA, Y
SAIKI, K
KOMA, A
机构
[1] Department of Chemistry, University of Tokyo, Bunkyo-ku, Tokyo, 113
关键词
8;
D O I
10.1016/0038-1098(93)90551-W
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Surface and interface optical phonons (F-K mode) of LiBr epitaxial films with various thickness grown on Si(100) have been investigated by high resolution electron energy loss spectroscopy (HREELS). In addition to single excitations of surface and interface phonons, their multiple excitations and annihilations have also been observed. The dependence of surface phonon energy with film thickness are compared with dielectric theory calculations. It has been found that phonon energies deviate more than the predictions of dielectric approximation with the decrease in the film thickness down to few nm, indicating the necessity of microscopic treatment in this thickness range.
引用
收藏
页码:1013 / 1015
页数:3
相关论文
共 9 条
[1]   SURFACE AND PSEUDOSURFACE MODES IN IONIC CRYSTALS [J].
CHEN, TS ;
ALLDREDGE, GP ;
DEWETTE, FW ;
ALLEN, RE .
PHYSICAL REVIEW LETTERS, 1971, 26 (25) :1543-+
[2]  
Ibach H., 1982, ELECTRON ENERGY LOSS
[3]   ELECTRON-ENERGY-LOSS SPECTROSCOPY OF MULTILAYERED MATERIALS - THEORETICAL ASPECTS AND STUDY OF INTERFACE OPTICAL PHONONS IN SEMICONDUCTOR SUPERLATTICES [J].
LAMBIN, P ;
VIGNERON, JP ;
LUCAS, AA .
PHYSICAL REVIEW B, 1985, 32 (12) :8203-8215
[4]   CAF2/SI(111) - THIN-FILM CHARACTERIZATION BY HIGH-RESOLUTION ELECTRON-ENERGY-LOSS SPECTROSCOPY [J].
LIEHR, M ;
THIRY, PA ;
PIREAUX, JJ ;
CAUDANO, R .
PHYSICAL REVIEW B, 1986, 34 (10) :7471-7474
[5]   DIELECTRIC DISPERSION AND STRUCTURES OF IONIC LATTICES [J].
LOWNDES, RP ;
MARTIN, DH .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1969, 308 (1495) :473-&
[6]  
LUCAS AA, 1972, PROG SURF SCI, V2, P2
[7]   Heteroepitaxial growth of alkali halide thin films on GaAs substrates [J].
Saiki, Koichiro ;
Nakamura, Yuji ;
Koma, Atsushi .
Surface Science, 1992, 269 pt 70 (1 -3 pt B) :790-796
[8]  
SAIKI K, UNPUB
[9]   CONTRIBUTION OF SURFACE MICROSCOPIC PHONONS TO THE ELECTRON ENERGY-LOSS SPECTRUM OF IONIC FILMS ON AN INTRINSIC SEMICONDUCTOR [J].
SENET, P ;
LAMBIN, P ;
LUCAS, AA .
SURFACE SCIENCE, 1992, 269 :141-145