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Compact Skyrmions, Merons and Bimerons in Thin Chiral Magnetic Films
Motohiko Ezawa
A meron is a controversial topological excitation because it carries just one half of the topological charge unit. It is believed that it is tightly binded to another meron and can…
Giant Skyrmions Stabilized by Dipole-Dipole Interactions in Thin Ferromagnetic Films
Motohiko Ezawa
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 a…
Manipulation of two spin qubits in a double quantum dot using an electric field
Atsuo Shitade, Motohiko Ezawa, Naoto Nagaosa
We propose purely electric manipulation of spin qubits by means of the spin-orbit interaction (SOI) {\it without magnetic field or magnets} in a double-quantum dot. All the unitary…
Generation and Manipulation of Spin Current in Graphene Nanodisks: Robustness against Randomness and Lattice Defects
Motohiko Ezawa
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 for…
Current Modulator based on Topological Insulator with Sliding Magnetic Superlattice
Motohiko Ezawa, Jiadong Zang
We study theoretically the surface of a topological insulator with a sliding magnetic superlattice coated above. By analyzing time-dependent Dirac equations, the dynamics of the ze…