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Hiroaki Ishizuka,Yukitoshi Motome 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
A numerical investigation on the thermodynamic properties of an Ising spin Kondo lattice modelon a kagome lattice is reported. By using a Monte Carlo simulation, we investigated the magneticphases at 1/3 filling. We identified two successive transitions from a high-temperature paramagneticstate to a Kosterlitz-Thouless-like phase in an intermediate temperature range and to a partiallydisordered phase at lower temperatures. The partially disordered state was characterized by the coexistenceof antiferromagnetic hexagons and paramagnetic sites with period p3×p3. We comparedthe results with those for the model on a triangular lattice.
Ground-state Phase Diagram of the Kondo Lattice Model on Triangular-to-kagome Lattices
Yutaka Akagi,Yukitoshi Motome 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We investigate the ground-state phase diagram of the Kondo lattice model with classical localizedspins on triangular-to-kagome lattices by using a variational calculation. We identify the parameterregions where a four-sublattice noncoplanar order is stable with a finite spin scalar chirality whilechanging the lattice structure from triangular to kagome continuously. Although the noncoplanarspin states appear over a wide range of parameters, the spin configurations on the kagome networkbecome coplanar as approaching the kagome lattice; eventually, the scalar chirality vanishes for thekagome lattice model.
Video Recognition by Physical Reservoir Computing in Magnetic Materials
Kaito Kobayashi,Yukitoshi Motome 한국물리학회 2023 새물리 Vol.73 No.12
Nonlinear spin dynamics in magnetic materials offers a promising avenue for implementing physical reservoir computing, one of the most accomplished brain-inspired frameworks for information processing. In this study, we investigate the practical utility of magnetic physical reservoirs by assessing their performance in a video recognition task. Leveraging a recently developed spatiotemporal parallelization scheme, our reservoir achieves accurate classifications of successively provided images. Our findings pave the way for the development of visual sensors based on the magnetic physical reservoir computing.
Majorana fermions in the Kitaev quantum spin system α-RuCl<sub>3</sub>
Do, Seung-Hwan,Park, Sang-Youn,Yoshitake, Junki,Nasu, Joji,Motome, Yukitoshi,Kwon, Yong ,Seung,Adroja, D. T.,Voneshen, D. J.,Kim, Kyoo,Jang, T.-H.,Park, J.-H.,Choi, Kwang-Yong,Ji, Sungdae Nature Publishing Group 2017 Nature physics Vol.13 No.11
<P>Geometrical constraints to the electronic degrees of freedom within condensed-matter systems often give rise to topological quantum states of matter such as fractional quantum Hall states, topological insulators, and Weyl semimetals(1-3). In magnetism, theoretical studies predict an entangled magnetic quantum state with topological ordering and fractionalized spin excitations, the quantum spin liquid(4). In particular, the so-called Kitaev spin model(5), consisting of a network of spins on a honeycomb lattice, is predicted to host Majorana fermions as its excitations. By means of a combination of specific heat measurements and inelastic neutron scattering experiments, we demonstrate the emergence of Majorana fermions in single crystals of alpha-RuCl3, an experimental realization of the Kitaev spin lattice. The specific heat data unveils a two-stage release of magnetic entropy that is characteristic of localized and itinerant Majorana fermions. The neutron scattering results corroborate this picture by revealing quasielastic excitations at low energies around the Brillouin zone centre and an hour-glass-like magnetic continuum at high energies. Our results confirm the presence of Majorana fermions in the Kitaev quantum spin liquid and provide an opportunity to build a unified conceptual framework for investigating fractionalized excitations in condensed matter(1,6-8).</P>