T
Takafumi Sato
Researcher at Tohoku University
Publications - 320
Citations - 12559
Takafumi Sato is an academic researcher from Tohoku University. The author has contributed to research in topics: Angle-resolved photoemission spectroscopy & Photoemission spectroscopy. The author has an hindex of 59, co-authored 263 publications receiving 11032 citations. Previous affiliations of Takafumi Sato include University of the Ryukyus & Solid State Physics Laboratory.
Papers
More filters
Journal ArticleDOI
Experimental realization of a topological crystalline insulator in SnTe
Yukio Tanaka,Zhi Ren,Takafumi Sato,Kosuke Nakayama,Seigo Souma,Takashi Takahashi,Kouji Segawa,Yoichi Ando +7 more
TL;DR: A topological crystalline insulator has surface metallic states that are topologically protected by time-reversal symmetry as discussed by the authors, where the surface metallic state is instead protected by the mirror symmetry of the crystal.
Journal ArticleDOI
Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
Hong Ding,Pierre Richard,Kosuke Nakayama,Katsuaki Sugawara,Toshiyuki Arakane,Y. Sekiba,Akari Takayama,Seigo Souma,Takafumi Sato,Takashi Takahashi,Ziqiang Wang,Xi Dai,Zhilai Fang,Genfu Chen,Janlin Luo,Nanlin Wang +15 more
TL;DR: In this paper, a high-resolution angle-resolved photoelectron spectroscopy study on the Ba0.6K0.4Fe2As2 (Tc=37 K) superconductor was performed, and the isotropic pairing interactions are strongly orbital dependent, as the ratio 2Δ/kBTc switches from weak to strong coupling on different bands.
Journal ArticleDOI
Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
Hong Ding,Pierre Richard,Kosuke Nakayama,T. Sugawara,Toshiyuki Arakane,Y. Sekiba,Akari Takayama,Seigo Souma,Takafumi Sato,Takashi Takahashi,Zhiwei Wang,Xi Dai,Zhong Fang,G. F. Chen,J. L. Luo,Nanlin Wang +15 more
TL;DR: In this paper, the authors reported a direct observation of the superconducting gap, including its momentum, temperature, and Fermi surface (FS) dependence in Ba0.6K0.4Fe2As2 (Tc = 37 K) using angle-resolved photoelectron spectroscopy.
Journal ArticleDOI
Evolution of the pseudogap from Fermi arcs to the nodal liquid
Amit Kanigel,Amit Kanigel,Michael R. Norman,Mohit Randeria,Utpal Chatterjee,Utpal Chatterjee,Seigo Souma,Adam Kaminski,H. M. Fretwell,Stephan Rosenkranz,M. Shi,M. Shi,Takafumi Sato,Takashi Takahashi,Zhao-Shen Li,Helene Raffy,Kazuo Kadowaki,D. G. Hinks,Lutfi Ozyuzer,Juan Carlos Campuzano,Juan Carlos Campuzano +20 more
TL;DR: In this paper, angle-resolved photoemission spectroscopy was used to show that the anisotropy of the pseudogap in k-space and the resulting arcs depend only on the ratio T/T*(x).
Journal ArticleDOI
Tunable Dirac cone in the topological insulator Bi(2-x)Sb(x)Te(3-y)Se(y).
Toshiyuki Arakane,Takafumi Sato,Seigo Souma,K. Kosaka,Kosuke Nakayama,M. Komatsu,Takashi Takahashi,Zhi Ren,Kouji Segawa,Yoichi Ando +9 more
TL;DR: It is demonstrated that Bi(2-x)Sb(x)Te(3-y)Se(y) is a system that simultaneously satisfies both a highly insulating bulk and tunable Dirac cone surface states and opens a promising pathway to the development of novel devices based on topological insulators.