セガワ コウジ   SEGAWA KOJI
  瀬川 耕司
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2013/05
形態種別 研究論文
標題 Anomalous Dressing of Dirac Fermions in the Topological Surface State of Bi2Se3, Bi2Te3, and Cu-Doped Bi2Se3
執筆形態 その他
掲載誌名 PHYSICAL REVIEW LETTERS
出版社・発行元 AMER PHYSICAL SOC
巻・号・頁 110(21)
著者・共著者 Takeshi Kondo,Y. Nakashima,Y. Ota,Y. Ishida,W. Malaeb,K. Okazaki,S. Shin,M. Kriener,Satoshi Sasaki,Kouji Segawa,Yoichi Ando
概要 Quasiparticle dynamics on the topological surface state of Bi2Se3, Bi2Te3, and superconducting CuxBi2Se3 are studied by 7 eV laser-based angle resolved photoemission spectroscopy. We find strong mode couplings in the Dirac-cone surface states at energies of similar to 3 and similar to 15-20 meV associated with an exceptionally large coupling constant lambda of similar to 3, which is one of the strongest ever reported for any material. This result is compatible with the recent observation of a strong Kohn anomaly in the surface phonon dispersion of Bi2Se3, but it appears that the theoretically proposed "spin-plasmon" excitations realized in helical metals are also playing an important role. Intriguingly, the similar to 3 meV mode coupling is found to be enhanced in the superconducting state of CuxBi2Se3.
DOI 10.1103/PhysRevLett.110.217601
ISSN 0031-9007
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