Professor Kouji SEGAWA

Area and Subject Taught Quantum Functional Materials
Research Theme(s) Experimental research on topological materials
Academic Degrees Ph. D (Science)
Keywords for Research Field Solid state physics, Topological insulators, Topological superconductors, Transport properties, Single crystals
Office Phone Number Not Public
e-mail Not Public

Research Overview

The research field of Segawa laboratory is the experimental research on solid state physics. We cover a wide experimental activities, such as the material synthesis, measurement of basic physical properties, and development of research equipment. On the material synthesis, we grow single crystals by the melt-growth method with quartz-tube sealing and the flux method, and thin films by the sputtering method. At present we focus on topological insulators/superconductors, and we are ready to grow various materials depending on the research trends and/or students’ interest. The transport properties and magnetic properties can be measured at the temperature range from 1.5K to 500K, and at the magnetic fields up to 8 tesla.

Notable Publications and Works in the Last Three Years

  1. S. Yonezawa, K. Tajiri, S. Nakata, Y. Nagai, Z. Wang, K. Segawa, Y. Ando and Y. Maeno, “Thermodynamic evidence for nematic superconductivity in CuxBi2Se3”, Nat. Phys. 13, 123 (2017).
  2. K. Matano, M. Kriener, K. Segawa, Y. Ando and G.-Q. Zheng, “Spin-rotation symmetry breaking in the superconducting state of CuxBi2Se3”, Nat. Phys. 12, 852 (2016).
  3. Z. Wang, K. Segawa, S. Sasaki, A.A. Taskin and Y. Ando, “Ferromagnetism in Cr-doped topological insulator TlSbTe2, APL Mater. 3 083302 (2015).
  4. K. Segawa, “Synthesis and Characterization of 3D Topological Insulators: a Case TlBi(S1-xSex)2, Science and Technology of Advanced Materials 16 014405 (2015).
  5. K. Segawa, A.A. Taskin and Y. Ando, “Pb5Bi24Se41: A new Member of the Homologous Series Forming Topological Insulator Heterostructures”, J. Solid Stat. Chem. 221 196-201 (2015).
  6. Z. Wang, K. Segawa, S. Sasaki, A.A. Taskin and Y. Ando, “Ferromagnetism in Cr-doped topological insulator TlSbTe2, APL Materials 3 - (2015).
  7. S. Sasaki, K. Segawa and Y. Ando, “Superconductor derived from a topological insulator heterostructure”, Phys. Rev. B 90 220504 (2014).