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Sb
with an ordered honeycomb networkImazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
Journal of the Physical Society of Japan, 95(4), p.044704_1 - 044704_7, 2026/04
Times Cited Count：0no abstracts in English
Aoki, Dai*; Brison, J.-P.*; Flouquet, J.*; Ishida, Kenji*; Knebel, G.*; Tokunaga, Yo; Yanase, Yoichi*
Journal of Physics; Condensed Matter, 34(24), p.243002_1 - 243002_41, 2022/06
Times Cited Count：177 Percentile：90.46(Physics, Condensed Matter)
Bi
Se
Wang, J.*; Ran, K.*; Li, S.*; Ma, Z.*; Bao, S.*; Cai, Z.*; Zhang, Y.*; Nakajima, Kenji; Kawamura, Seiko; 
erm
k, P.*; et al.
Nature Communications (Internet), 10, p.2802_1 - 2802_6, 2019/06
Times Cited Count：24 Percentile：76.35(Multidisciplinary Sciences)Ota, Yukihiro; Nagai, Yuki; Machida, Masahiko
Physica C, 518, p.5 - 9, 2015/11
Times Cited Count：0 Percentile：0.00(Physics, Applied)Topological superconductors are notable materials, owing to the mathematical interest as topological matter and the application potential of quantum engineering. To clarify their characters relying on gap-function types, we build up a low-energy effective theory, focusing on a model of superconductor Cu
BiSe. The non-magnetic impurity effects in our previous numerical study indicates that the system has both p-wave and s-wave aspects. A perturbation study is insightful for explaining this peculiar behavior. Since the normal electrons are dominated by the Dirac-type dispersion relation, we assign a low-energy case as a large-Dirac-mass one. When the system has an odd-parity fully-gapped pair potential, our approach indicates that the effective gap function in the low-energy domain has not only a chiral p-wave-like component, but also an s-wave-like one. This peculiar mixture of p-wave and s-wave leads to intriguing responses in the present model.
SbImazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
no journal, ,
Ota, Yukihiro; Nagai, Yuki; Machida, Masahiko
no journal, ,
Topological superconductors (TSC) are notable materials, owing to the mathematical curiosity and the application potential. The bulk TSC can emerge by copper intercalation into topological insulator BiSE. In this paper, we theoretically study the non-magnetic impurity effects in the mean-field model of CuBiSE, focusing on the odd-parity fully-gapped superconducting state. Calculating the density of states with a self-consistent 
-matrix approach, we test the presence of mid-gap states, leading to pair-breaking effects. Remarkably, the sensitivity to non-magnetic impurities strongly depend on a normal-state dispersion character, i.e., either non-relativistic or relativistic dispersion relations. We show unification picture for understanding this intriguing result, deriving a low-energy effective superconducting theory.
Ota, Yukihiro; Nagai, Yuki; Machida, Masahiko
no journal, ,
Seeking bulk topological superconductors is one of the most attractive issues in condensed matter physics and materials science now. Specifically, superconducting topological insulator copper-doped BiSe
is a strong candidate of bulk topological superconductors. The characters mainly rely on Dirac-type electron's dispersion relations. In this paper, we show the Ginzburg-Landau (GL) theory in an effective two-orbital model of copper-doped BiSe, within weak-coupling superconductivity. The resultant theory predicts various curious thermodynamical and transport phenomena of this system. Among them, we propose a way of detecting a topological state with the London penetration depth.
Imazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
no journal, ,
no abstracts in English
Sb on the ordered honeycomb networkImazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
no journal, ,
SbImazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
no journal, ,
no abstracts in English
Imazu, Tsuyoshi; Furutani, Naoya*; Adachi, Tadashi*; Kudo, Kazutaka*; Imai, Yoshiki*; Goryo, Jun*
no journal, ,
no abstracts in English
