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Exact solutions in two-dimensional topological superconductors: Hubbard interaction induced spontaneous symmetry breaking
Motohiko Ezawa
We present an exactly solvable model of a spin-triplet -wave topological superconductor on the honeycomb lattice in the presence of the Hubbard interaction for arbitrary interac…
Higher-order topological insulators and semimetals on the breathing Kagome and pyrochlore lattices
Motohiko Ezawa
A second-order topological insulator in dimensions is an insulator which has no dimensional topological boundary states but has dimensional topological boundary sta…
Exact solutions and topological phase diagram in interacting dimerized Kitaev topological superconductors
Motohiko Ezawa
It was recently shown that an interacting Kitaev topological superconductor model is exactly solvable based on two-step Jordan-Wigner transformations together with one spin rotatio…
Electric field-induced creation and directional motion of domain walls and skyrmion bubbles
Chuang Ma, Xichao Zhang, Jing Xia +7
Magnetization dynamics driven by an electric field could provide long-term benefits to information technologies because of its ultralow power consumption. Meanwhile, the Dzyaloshin…
Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
Keita Hamamoto, Motohiko Ezawa, Kun Woo Kim +2
Spin current plays a central role in spintronics. In particular, finding more efficient ways to generate spin current has been an important issue and studied actively. For example,…
Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy
Seonghoon Woo, Kyung Mee Song, Xichao Zhang +12
Spintronic devices based on magnetic skyrmions are a promising candidate for next-generation memory applications due to their nanometre-size, topologically-protected stability and…
Merging of momentum-space monopoles by controlling magnetic field: From cubic-Dirac to triple-Weyl fermion systems
Motohiko Ezawa
We analyze a generalized Dirac system, where the dispersion along the and axes is -th power and linear along the axis. When we apply magnetic field, ther…
Photoinduced topological phase transition from a crossing-line nodal semimetal to a multiple-Weyl semimetal
Motohiko Ezawa
We propose a simple scheme to construct a model whose Fermi surface is comprised of crossing-line nodes. The Hamiltonian consists of a normal hopping term and an additional term wh…
Topological Semimetals carrying Arbitrary Hopf Numbers: Hopf-Link, Solomon's-Knot, Trefoil-Knot and Other Semimetals
Motohiko Ezawa
We propose a new type of Hopf semimetals indexed by a pair of numbers , where the Hopf number is given by . The Fermi surface is given by the preimage of the Hopf map, w…
Triplet Fermions and Dirac Fermions in Borophene
Motohiko Ezawa
Borophene is a monolayer materials made of boron. A perfect planar boropehene called borophene has Dirac cones and they are well reproduced by a tight-binding model accord…
Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
Seonghoon Woo, Kyung Mee Song, Xichao Zhang +16
Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperat…
Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition
Xichao Zhang, Jing Xia, Yan Zhou +3
The helicity-orbital coupling is an intriguing feature of magnetic skyrmions in frustrated magnets. Here, we explore the skyrmion dynamics in a frustrated magnet based on the $J_{1…