Yukitoshi Motome

University of Tokyo

Hubbard modelQuantum spin liquidMagnetic fieldPhysicsLattice (order)ElectronPhase transitionAntiferromagnetismMaterials scienceMonte Carlo methodGeometrical frustrationCondensed matter physicsSpinsSpin (physics)Quantum mechanicsGround stateFerromagnetismSpin-½Phase diagramHexagonal lattice

460Publications

39H-index

4,624Citations

Publications 376

Newest

#1Kohei Fujiwara (Tohoku University)H-Index: 18

#2Yasuyuki Kato (UTokyo: University of Tokyo)H-Index: 20

Last. Atsushi Tsukazaki (Tohoku University)H-Index: 61

view all 7 authors...

Non-coplanar spin textures with finite scalar spin chirality can be artificially induced at surfaces and interfaces through the interfacial Dzyaloshinskii-Moriya interaction. However, stabilizing a proper magnetic skyrmion crystal via this route remains elusive. Here, using an epitaxial bilayer of platinum and geometrically frustrated kagome-lattice ferromagnet Fe3Sn, we show the possible formation of a two-dimensional skyrmion crystal under well-regulated Fe3Sn thickness conditions. Magnetizati...

#1Seong-Hoon Jang (UTokyo: University of Tokyo)H-Index: 3

#2Yukitoshi Motome (UTokyo: University of Tokyo)H-Index: 39

Quantum Monte Carlo method on asymptotic Lefschetz thimbles for quantum spin systems: An application to the Kitaev model in a magnetic field

#1Petr A. Mishchenko (UTokyo: University of Tokyo)H-Index: 3

#2Yasuyuki Kato (UTokyo: University of Tokyo)H-Index: 20

Last. Yukitoshi Motome (UTokyo: University of Tokyo)H-Index: 39

view all 3 authors...

#1Shun Okumura (UTokyo: University of Tokyo)H-Index: 6

#2Takahiro MorimotoH-Index: 35

Last. Yukitoshi MotomeH-Index: 39

view all 4 authors...

We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic state while increasing the magnetic field along the helical axis. We find that the conductivity in the helimagnetic state at zero field depends on the electron filling and the coefficient of the spin-charge coupling. We also find that the conductivity in the conical magnetic state changes nonlinearly to the applied field,...

#1Kotaro Shimizu (UTokyo: University of Tokyo)H-Index: 5

#2Shun OkumuraH-Index: 6

Last. Yukitoshi MotomeH-Index: 39

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We theoretically study skyrmion lattices realized in a Kondo lattice model on a triangular lattice, focusing on the phase, ellipticity, and angle of the constituent multiple-Qwaves. Analyzing the numerical data obtained in the previous study [Ozawa R, Hayami S and Motome Y 2017 Phys. Rev. Lett. 118 147205], we extract these parameters for the two types of skyrmion lattices with the skyrmion number of 1and 2 We show that the topological transition between the two skyrmion lattices driven...

Spin excitation spectra in helimagnetic states: proper-screw, cycloid, vortex crystal, and hedgehog lattice

#1Yasuyuki KatoH-Index: 20

#2Satoru HayamiH-Index: 20

Last. Yukitoshi MotomeH-Index: 39

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We investigate the spin excitation spectra in chiral and polar magnets by the linear spin-wave theory for an effective spin model with symmetric and antisymmetric long-range interactions. In one dimension, we obtain the analytic form of the dynamical spin structure factor for proper-screw and cycloidal helical spin states with uniform twists, which shows a gapless mode with strong intensity at the helical wave number. When introducing spin anisotropy in the symmetric interactions, we numerically...

#1Koji InuiH-Index: 1

#2Yasuyuki KatoH-Index: 20

Last. Yukitoshi MotomeH-Index: 39

view all 3 authors...

We propose a general framework for finding the ground state of many-body fermionic systems by using feed-forward neural networks. The anticommutation relation for fermions is usually implemented to a variational wave function by the Slater determinant (or Pfaffian), which is a computational bottleneck because of the numerical cost of O(N^3)for Nparticles. We bypass this bottleneck by explicitly calculating the sign changes associated with particle exchanges in real space and using fully co...

#1Satoru Hayami (UTokyo: University of Tokyo)H-Index: 20

#2Yukitoshi Motome (UTokyo: University of Tokyo)H-Index: 39

Spin textures with nontrivial topology, such as vortices and skyrmions, have attracted attention as a source of unconventional magnetic, transport, and optical phenomena. Recently, a new generation of topological spin textures has been extensively studied in itinerant magnets; in contrast to the conventional ones induced, e.g., by the Dzyaloshinskii-Moriya interaction in noncentrosymmetric systems, they are characterized by extremely short magnetic periods and stable even in centrosymmetric syst...

#1Satoru Hayami (UTokyo: University of Tokyo)H-Index: 20

#2Yukitoshi Motome (UTokyo: University of Tokyo)H-Index: 39

Coupling between spin and charge degrees of freedom in electrons is a source of various electronic and magnetic properties of solids. We theoretically study charge density waves induced by the spin-charge coupling in the presence of magnetic orderings in itinerant magnets. By performing a perturbative calculation in the weak-coupling limit of the Kondo lattice model, we derive a useful formula for the relationship between charge and spin density waves, which can be applied to any magnetic orderi...

#1Shun OkumuraH-Index: 6

#2Takahiro MorimotoH-Index: 35

Last. Yukitoshi MotomeH-Index: 39

view all 4 authors...

Chiral magnets, which break both spatial inversion and time reversal symmetries, carry a potential for quadratic optical responses. Despite the possibility of enhanced and controlled responses through the magnetic degree of freedom, the systematic understanding remains yet to be developed. We here study nonlinear optical responses in a prototypical chiral magnetic state with a one-dimensional conical order by using the second-order response theory. We show that the photovoltaic effect and the se...

Close Researchers

Joji Nasu

H-index : 20

Nobuo Furukawa

H-index : 44

Satoru Hayami

H-index : 20

Nobuyuki Kurita

H-index : 18

Masafumi Udagawa

H-index : 19

Yasuyuki Kato

H-index : 20

Kaori Sugii

H-index : 13

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