RESEARCH

We have performed experimental research on topological insulators/superconductors using single-crystal synthesis and precision measurements of transport properties. A part of our achievements as a member of the previous "Topological Quantum Phenomena" project are listed as follow:- Single-crystal synthesis and observation of the surface state in transport properties with the bulk-insulating topological insulators (TIs) Bi2Te2Se and Bi1.5Sb0.5Te1.7Se1.3 - Synthesis of the first ternary TI TlBiSe2 - Synthesis of high-quality superconducting CuxBi2Se3 single crystals.

In the present project, we synthesize TI-related systems like Dirac/Weyl semimetals, as well as the TIs and candidates of topological superconductors. Our attempts are also on making thin films of complex materials with TIs and observation of novel quantum properties in the complex systems.

EDUCATION

1994

Bachelor of Science (Physics), Kyoto University

1996

Master of Science (Physics), University of Tokyo

2005

Ph.D. (Science), University of Tokyo

PROFESSIONAL EXPERIENCE

1996-2001

Research Associate, CRIEPI

2001-2007

Research Scientist, CRIEPI

2007-2008

Assistant Professor, ISIR, Osaka University

2008

Associate Professor, ISIR, Osaka University

2015-Present

Professor, Department of Physics, Kyoto Sangyo University

HONORS AND AWARDS

2013

17th Superconductivity Science and Technology Award

SELECTION OF PUBLICATIONS

"Spin-rotation symmetry breaking in the superconducting state of Cu_xBi₂Se₃"
K. Matano, M. Kriener, K. Segawa, Y. Ando and G.-q. Zheng,
Nature Physics advance online publication 2016, 3781-1-4 (May 2016).
DOI: 10.1038/nphys3781

"Synthesis and Characterization of 3D Topological Insulators: a Case TlBi(S1–xSex)2"
K. Segawa,
Science and Technology of Advanced Materials 16, 014405-1-9 (Feb. 2015).
DOI: 10.1088/1468-6996/16/1/014405

"Pb5Bi24Se41: A new Member of the Homologous Series Forming Topological Insulator Heterostructures"
K. Segawa, A.A. Taskin and Y. Ando,
J. Solid Stat. Chem. 221, 196-201 (2015)[online Oct. 2014].
DOI: 10.1016/j.jssc.2014.09.034

"Superconductor derived from a topological insulator heterostructure"
S. Sasaki, K. Segawa and Y. Ando,
Phys. Rev. B 90, 220504-1-5 (Dec. 2014).
DOI: 10.1103/PhysRevB.90.220504

"Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor", S. Sasaki, Z. Ren, A.A. Taskin, K. Segawa, L. Fu and Y. Ando,
Phys. Rev. Lett. 109, 217004-1-5 (Nov. 2012).
DOI: 10.1103/PhysRevLett.109.217004

"Direct Measurement of the Out-of-Plane Spin Texture in the Dirac-Cone Surface State of a Topological Insulator"
S. Souma, K. Kosaka, T. Sato, M. Komatsu, A. Takayama, T. Takahashi, M. Kriener, K. Segawa and Y. Ando,
Physical Review Letters 106, 216803-1-4 (May. 2011).
DOI: 10.1103/PhysRevLett.106.216803

"Bulk Superconducting Phase with a Full Energy Gap in the Doped Topological Insulator Cu_xBi₂Se₃"
M. Kriener, K. Segawa, Z. Ren, S. Sasaki and Y. Ando,
Physical Review Letters 106 127004-1-4 (Mar. 2011).
DOI: 10.1103/PhysRevLett.106.127004

"Direct Evidence for the Dirac-Cone Topological Surface States in the Ternary Chalcogenide TlBiSe₂"
T. Sato, K. Segawa, H. Guo, K. Sugawara, S. Souma, T. Takahashi and Y. Ando,
Physical Review Letters 105 136802-1-4 (Sep. 2010).
DOI: 10.1103/PhysRevLett.105.136802

"Zero-doping state and electron-hole asymmetry in an ambipolar cuprate"
K. Segawa, M. Kofu, S-H. Lee, I. Tsukada, H. Hiraka, M. Fujita, S. Chang, K. Yamada, and Yoichi Ando,
Nature Physics 6 579-583 (Jul. 2010).
DOI: 10.1038/nphys1717

"Doping n-Type Carriers by La-Substitution for Ba in YBa₂Cu₃O_y System"
K. Segawa and Y. Ando,
Physical Review B 74 100508-1-4 (Sep. 2006).
DOI: 10.1103/PhysRevB.74.100508

"Intrinsic Hall response of the CuO₂ planes in a chain-plane-composite system of YBa₂Cu₃O_y"
K. Segawa and Y. Ando,
Physical Review B 69 104521-1-8 (Mar. 2004).
DOI: 10.1103/PhysRevB.69.104521

"Electrical resistivity anisotropy from self-organized one-dimensionality in high-temperature superconductors"
Yoichi Ando, K. Segawa, Seiki Komiya, and A. N. Lavrov,
Physical Review Letters 88 137005-1-4 (Mar. 2002) .
DOI: 10.1103/PhysRevLett.88.137005