Motohiko Ezawa

J-GLOBAL         Last updated: Apr 16, 2019 at 12:38
Motohiko Ezawa
The University of Tokyo
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Published Papers

Zhang Xichao, Xia Jing, Zhou Yan, Liu Xiaoxi, Zhang Han, Ezawa Motohiko
NATURE COMMUNICATIONS   8    Nov 2017   [Refereed]
Hamamoto Keita, Ezawa Motohiko, Kim Kun Woo, Morimoto Takahiro, Nagaosa Naoto
PHYSICAL REVIEW B   95(22)    Jun 2017   [Refereed]
Ezawa Motohiko
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84(12)    Dec 2015   [Refereed]


Motohiko Ezawa
Phys.Rev.Lett.105:197202,2010      Jul 2010
Motivated by a recent magnetization reversal experiment on a TbFeCo thin
film, we study a topological excitation in the anisotropic nonlinear sigma
model together with the Zeeman and magnetic dipole-dipole interactions.
Dipole-dipole interactions ...
Motohiko Ezawa
Physica E 42, 703 (2010)      Mar 2010
Trigonal zigzag graphene nanodisk exhibits magnetism whose spin is
proportional to the edge length of the nanodisk. Its spin can be designed from
1/2 to a huge value. The spins form a quasiferromagnet, which has intermediate
properties between a s...
Motohiko Ezawa
New J. Phys. 11, 095005 (2009)      Oct 2009
A zigzag graphene nanodisk can be interpreted as a quantum dot with an
internal degree of freedom. It is well described by the infinite-range
Heisenberg model. We have investigated its thermodynamical properties. There
exists a quasi-phase transit...
Motohiko Ezawa
Phys. Rev. B 79, 241407(R) (2009)      May 2009
The trigonal zigzag nanodisk with size Tex has Tex localized spins. We
investigate its thermodynamical properties with and without external leads.
Leads are made of zigzag graphene nanoribbons or ordinary metallic wires. There
exists a quasi-phase...
Motohiko Ezawa
Eur. Phys. J. B 67, 543 (2009)      Aug 2008
Graphene nanodisk is a graphene derivative with a closed edge. The trigonal
zigzag nanodisk with size Tex has Tex-fold degenerated zero-energy states. A
nanodisk can be interpletted as a quantum dot with an internal degree of
freedom. The grand st...

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