Dirac electrons in topological crystalline insulators

  • Yoshinori Okada Quantum Materials Science Laboratory, Okinawa Institute of Science and Technology


One of the simplest but universal challenges at the frontier of materials physics is controlling band structure, both for realizing novel phenomena and for practical functionalities. In this talk, I will describe our atomic scale investigations of novel quantum materials called topological crystalline insulators (TCIs). In TCIs, topology and crystal symmetry intertwine to create massless Dirac electrons, which can be described by the same equations used for relativistic particles traveling close to the speed of light. Using Landau level spectroscopy and atomic resolution imaging in TCIs, we have discovered massive Dirac electrons coexisting with massless Dirac electrons. Our findings experimentally demonstrate the unique and extraordinary tunability of Dirac electrons in TCIs, which provides a significant step for realizing fundamentally and practically important quantum states via strain engineering. As the final part of this talk, I will also introduce our recent attempt of combing visualization techniques with epitaxial thin film based quantum materials design.

About the Speaker

Yoshinori Okada is an Assistant Professor of the Quantum Materials Science Laboratory of the Okinawa Institute of Science and Technology (OIST). After obtaining his PhD degree from the Department of Crystalline Materials Science of Nagoya University in 2009, he was a postdoctoral researcher at the Massachusetts Institute of Technology (2009-2010) and Boston College (2010-2013). He then became an Assistant Professor at the Advanced Institute of Materials Research in Tohoku University from 2013 to 2017 where his work was supported by the Inamori and Sumitomo Foundations. His research focuses on topological quantum phenomena, strongly correlated systems, unconventional superconductors, and oxide electronics.

How to Cite
Y. Okada. Dirac electrons in topological crystalline insulators, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-INV-2B-01 (2018). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2018-INV-2B-01.