Prof. Yukio Tanaka Profile

Prof. Yukio Tanaka

at Department of Applied Physics

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Proceedings Article | 4 November 2016 Presentation

Andreev bound states in topological superconductors (Conference Presentation)

Yukio Tanaka, Bo Lu, Keiji Yada, Masatoshi Sato

Proceedings Volume 9931, 993143 (2016) https://doi.org/10.1117/12.2238685

KEYWORDS: Superconductors, Metalloids, Lutetium, Applied physics, System on a chip, Spintronics, Current controlled current source

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Andreev bound states in topological superconductors Yukio Tanaka1, Lu Bo1,, K. Yada1, A. Yamakage1, M. Sato2 1Department of Applied Physics, Nagoya University 2Yukawa Institute, Kyoto University e-mail: ytanaka@nuap.nagoya-u.ac.jp It is known that Andreev bound state is an important ingredient to identify unconventional superconductors [1]. Up to now, there have been several types of Andreev bound states stemming from their topological origins [2-3]. It can be classified into i)dispersionless flat band type realized in cuprate, ii)linear dispersion type realized in chiral superconductor like Sr2RuO4, iii)helical dispersion type realized in non-centrosymmetric superconductor and iv)cone type in the surface state on B-phase of superfluid 3He [3]. It has been noted that certain surfaces of Weyl semimetals have bound states forming open Fermi arcs, which are never seen in typical metallic states. We show that the Fermi arcs enable them to support an even more exotic surface state with crossed flat bands in the superconducting state. We clarify the topological origin of the crossed dispersionless flat bands and the relevant symmetry that stabilizes the cross point. Our symmetry analysis are applicable to known candidate materials of time-reversal breaking Weyl semimetals[4]. [1]S. Kashiwaya and Y. Tanaka, Rep. Prog. Phys. 63 1641 (2000). [2]Y. Tanaka, M. Sato, and N. Nagaosa, J. Phys. Soc. Jpn. 81 011013 (2012). [3] M. Sato, et al., Phys. Rev. Lett. 103 (2009) 020401. [4] B. Lu, K. Yada, M. Sato, and Y. Tanaka, Phys. Rev. Lett. 114 09

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