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  • 1
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    Thermally stable magnetic skyrmions in multilayer synthetic antiferromagnetic racetracks (2016)
    American Physical Society (APS)
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    Publication Date: 2016-08-04
    Description: Author(s): Xichao Zhang, Motohiko Ezawa, and Yan Zhou A magnetic skyrmion is a topological magnetization structure with a nanometric size and a well-defined swirling spin distribution, which is anticipated to be an essential building block for novel skyrmion-based device applications. We study the motion of magnetic skyrmions in multilayer synthetic an… [Phys. Rev. B 94, 064406] Published Wed Aug 03, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Edge states in silicene nanodisks (2013)
    American Physical Society (APS)
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    Publication Date: 2013-09-26
    Description: Author(s): Ko Kikutake, Motohiko Ezawa, and Naoto Nagaosa Silicene is a honeycomb structure of silicon atoms which shares many intriguing properties with graphene. We investigate the electronic properties of a silicene nanodisk, which is silicene with a closed edge. In the case of a graphene nanodisk, the number of the zero-energy modes is given by the low... [Phys. Rev. B 88, 115432] Published Wed Sep 25, 2013
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Topological Phase Transition without Gap Closing (2013)
    Springer Nature
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    Publication Date: 2013-09-28
    Description: Topological phase transition is accompanied with a change of topological numbers. According to the bulk-edge correspondence, the gap closing and the breakdown of the adiabaticity are necessary at the phase transition point to make the topological number ill-defined. However, the gap closing is not always needed. In this paper, we show that two topological distinct phases can be continuously connected without gap closing, provided the symmetry of the system changes during the process. Here we propose the generic principles how this is possible by demonstrating various examples such as 1D polyacetylene with the charge-density-wave order, 2D silicene with the antiferromagnetic order, 2D silicene or quantum well made of HgTe with superconducting proximity effects and 3D superconductor Cu doped Bi2Se3. It is argued that such an unusual phenomenon can occur when we detour around the gap closing point provided the connection of the topological numbers is lost along the detour path. Scientific Reports 3 doi: 10.1038/srep02790
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 4
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    Tunable skewed edges in puckered structures (2016)
    American Physical Society (APS)
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    Publication Date: 2016-06-16
    Description: Author(s): Marko M. Grujić, Motohiko Ezawa, Milan Ž. Tadić, and François M. Peeters We propose a type of edges arising due to the anisotropy inherent in the puckered structure of a honeycomb system such as in phosphorene. Skewed-zigzag and skewed-armchair nanoribbons are semiconducting and metallic, respectively, in contrast to their normal edge counterparts. Their band structures … [Phys. Rev. B 93, 245413] Published Wed Jun 15, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Magnetic skyrmion transistor: skyrmion motion in a voltage-gated nanotrack (2015)
    Springer Nature
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    Publication Date: 2015-06-19
    Description: Magnetic skyrmions are localized and topologically protected spin configurations, which are of both fundamental and applied interests for future electronics. In this work, we propose a voltage-gated skyrmion transistor within the well-established framework of micromagnetics. Its operating conditions and processes have been theoretically investigated and demonstrated, in which the gate voltage can be used to switch on/off a circuit. Our results provide the first time guidelines for practical realization of hybrid skyrmionic-electronic devices. Scientific Reports 5 doi: 10.1038/srep11369
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 6
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    Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions (2015)
    American Physical Society (APS)
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    Publication Date: 2015-02-06
    Description: Author(s): Motohiko Ezawa We investigate the realization of a topological superconductor in a generic bucked honeycomb system equipped with four types of mass-generating terms, where the superconductor gap is introduced by attaching the honeycomb system to an s-wave superconductor. Constructing the topological phase diagram,... [Phys. Rev. Lett. 114, 056403] Published Thu Feb 05, 2015
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Magnetic bilayer-skyrmions without skyrmion Hall effect (2016)
    Springer Nature
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    Publication Date: 2016-01-21
    Description: Article Magnetic skyrmions propagating under an applied current along a nanowire experience the magnus force, deflecting them towards the edges where they may be destroyed, potentially hindering their applications. Here, the authors propose a method to surpass this issue utilizing magnetic bilayers systems. Nature Communications doi: 10.1038/ncomms10293 Authors: Xichao Zhang, Yan Zhou, Motohiko Ezawa
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 8
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    High-topological-number magnetic skyrmions and topologically protected dissipative structure (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-01-21
    Description: Author(s): Xichao Zhang, Yan Zhou, and Motohiko Ezawa The magnetic skyrmion with the topological number of unity ( Q = 1 ) is a well-known nanometric swirling spin structure in the nonlinear σ model with the Dzyaloshinskii-Moriya interaction. Here we show that magnetic skyrmion with the topological number of two ( Q = 2 ) can be created and stabilized by apply… [Phys. Rev. B 93, 024415] Published Wed Jan 20, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Compact merons and skyrmions in thin chiral magnetic films (2011)
    American Physical Society (APS)
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    Publication Date: 2011-03-19
    Description: Author(s): Motohiko Ezawa A meron is a controversial topological excitation because it carries just one-half of the skyrmion number. A vortex in thin magnetic films has been argued to be a half-skyrmion, i.e., a meron. We present another type of merons, investigating the two-dimensional nonlinear sigma model together with th... [Phys. Rev. B 83, 100408] Published Fri Mar 18, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 10
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    High Spin-Chern Insulators with Magnetic Order (2013)
    Springer Nature
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    Publication Date: 2013-12-07
    Description: As a topological insulator, the quantum Hall (QH) effect is indexed by the Chern and spin-Chern numbers and . We have only in conventional QH systems. We investigate QH effects in generic monolayer honeycomb systems. We search for spin-resolved characteristic patterns by exploring Hofstadter's butterfly diagrams in the lattice theory and fan diagrams in the low-energy Dirac theory. It is shown that the spin-Chern number can takes an arbitrary high value for certain QH systems. This is a new type of topological insulators, which we may call high spin-Chern insulators. Samples may be provided by graphene on the SiC substrate with ferromagnetic order, transition-metal dichalcogenides with ferromagnetic order, transition-metal oxide with antiferromagnetic order and silicene with ferromagnetic order. Actually high spin-Chern insulators are ubiquitous in any systems with magnetic order. Nevertheless, the honeycomb system would provide us with unique materials for practical materialization. Scientific Reports 3 doi: 10.1038/srep03435
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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