Surface metallic states in ultrathin Bi(001) films studied with terahertz time-domain spectroscopy

被引:28
作者
Yokota, K. [1 ]
Takeda, J. [1 ]
Dang, C. [2 ]
Han, G. [2 ]
McCarthy, D. N. [2 ]
Nagao, T. [2 ]
Hishita, S. [3 ]
Kitajima, M. [4 ]
Katayama, I. [1 ]
机构
[1] Yokohama Natl Univ, Grad Sch Engn, Dept Phys, Yokohama, Kanagawa 2408501, Japan
[2] Natl Inst Mat Sci, WPI MANA, Tsukuba, Ibaraki 3050044, Japan
[3] Natl Inst Mat Sci, Environm & Energy Mat Div, Tsukuba, Ibaraki 3050044, Japan
[4] Natl Def Acad, Dept Appl Phys, Yokosuka, Kanagawa 2398686, Japan
基金
日本科学技术振兴机构;
关键词
BISMUTH; BI;
D O I
10.1063/1.4729149
中图分类号
O59 [应用物理学];
学科分类号
摘要
Dynamical response of surface metallic states in single crystalline ultrathin Bi(001) films on Si(111) 7 x 7 surface was investigated at a spectral range of 0.1-12 THz by broadband terahertz time-domain spectroscopy. The observed transmittance increased with a decrease in the thickness, without showing a gap structure. The measured complex dielectric dispersion was analyzed using a Drude model, and the plasma frequency (omega(p)) and damping constant (gamma) were found to be inversely proportional to the thickness. The results strongly indicate the existence of surface metallic states, whose carrier density and damping constant are estimated to be 3.08 x 10(19) cm(-3) and 4.83 x 10(2) THz, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729149]
引用
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页数:4
相关论文
共 21 条
[1]   Indication of charge-density-wave formation in Bi(111) -: art. no. 016403 [J].
Ast, CR ;
Höchst, H .
PHYSICAL REVIEW LETTERS, 2003, 90 (01) :4
[2]   Topological insulators with inversion symmetry [J].
Fu, Liang ;
Kane, C. L. .
PHYSICAL REVIEW B, 2007, 76 (04)
[3]   DYNAMICAL CONDUCTIVITY AND PLASMON EXCITATION IN BI [J].
GERLACH, E ;
GROSSE, P ;
RAUTENBERG, M ;
SENSKE, W .
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 1976, 75 (02) :553-558
[4]   Large surface-state conductivity in ultrathin Bi films [J].
Hirahara, T. ;
Matsuda, I. ;
Yamazaki, S. ;
Miyata, N. ;
Hasegawa, S. ;
Nagao, T. .
APPLIED PHYSICS LETTERS, 2007, 91 (20)
[5]   Direct observation of spin splitting in bismuth surface states [J].
Hirahara, T. ;
Miyamoto, K. ;
Matsuda, I. ;
Kadono, T. ;
Kimura, A. ;
Nagao, T. ;
Bihlmayer, G. ;
Chulkov, E. V. ;
Qiao, S. ;
Shimada, K. ;
Namatame, H. ;
Taniguchi, M. ;
Hasegawa, S. .
PHYSICAL REVIEW B, 2007, 76 (15)
[6]   Role of spin-orbit coupling and hybridization effects in the electronic structure of ultrathin Bi films [J].
Hirahara, T. ;
Nagao, T. ;
Matsuda, I. ;
Bihlmayer, G. ;
Chulkov, E. V. ;
Koroteev, Yu. M. ;
Echenique, P. M. ;
Saito, M. ;
Hasegawa, S. .
PHYSICAL REVIEW LETTERS, 2006, 97 (14)
[7]   Topological metal at the surface of an ultrathin Bi1-xSbx alloy film [J].
Hirahara, T. ;
Sakamoto, Y. ;
Saisyu, Y. ;
Miyazaki, H. ;
Kimura, S. ;
Okuda, T. ;
Matsuda, I. ;
Murakami, S. ;
Hasegawa, S. .
PHYSICAL REVIEW B, 2010, 81 (16)
[8]   Interfacing 2D and 3D Topological Insulators: Bi(111) Bilayer on Bi2Te3 [J].
Hirahara, Toru ;
Bihlmayer, Gustav ;
Sakamoto, Yusuke ;
Yamada, Manabu ;
Miyazaki, Hidetoshi ;
Kimura, Shin-ichi ;
Bluegel, Stefan ;
Hasegawa, Shuji .
PHYSICAL REVIEW LETTERS, 2011, 107 (16)
[9]   SEMIMETAL-TO-SEMICONDUCTOR TRANSITION IN BISMUTH THIN-FILMS [J].
HOFFMAN, CA ;
MEYER, JR ;
BARTOLI, FJ ;
DIVENERE, A ;
YI, XJ ;
HOU, CL ;
WANG, HC ;
KETTERSON, JB ;
WONG, GK .
PHYSICAL REVIEW B, 1993, 48 (15) :11431-11434
[10]   A topological Dirac insulator in a quantum spin Hall phase [J].
Hsieh, D. ;
Qian, D. ;
Wray, L. ;
Xia, Y. ;
Hor, Y. S. ;
Cava, R. J. ;
Hasan, M. Z. .
NATURE, 2008, 452 (7190) :970-U5