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

Kiyonobu Yokota | Zendy; Jun Takeda | Zendy; C.Y. Dang | Zendy; Guang Han | Zendy; David N. McCarthy | Zendy; Tadaaki Nagao | Zendy; Shunichi Hishita | Zendy; Masahiro Kitajima | Zendy; Ikufumi Katayama | Zendy

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

Author(s) -

Kiyonobu Yokota,

Jun Takeda,

C.Y. Dang,

Guang Han,

David N. McCarthy,

Tadaaki Nagao,

Shunichi Hishita,

Masahiro Kitajima,

Ikufumi Katayama

Publication year - 2012

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4729149

Subject(s) - terahertz radiation , drude model , materials science , spectroscopy , terahertz time domain spectroscopy , dielectric , dispersion (optics) , transmittance , terahertz spectroscopy and technology , condensed matter physics , plasma oscillation , surface states , optics , analytical chemistry (journal) , surface (topology) , optoelectronics , plasma , chemistry , physics , geometry , mathematics , chromatography , quantum mechanics

Dynamical response of surface metallic states in single crystalline ultrathin Bi(001) films on Si(111) 7 × 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 (ωp) and damping constant (γ) 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 × 1019 cm−3 and 4.83 × 102 THz, respectively.

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