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Purely electrical detection of a skyrmion in constricted geometry
Keita Hamamoto, Motohiko Ezawa, Naoto Nagaosa
How to detect the skyrmion position is a crucial problem in future skyrmionics since it corresponds to the reading process of information. We propose a method to detect the skyrmio…
Direct Band Gaps in Group IV-VI Monolayer Materials: Binary Counterparts of Phosphorene
C. Kamal, Aparna Chakrabarti, Motohiko Ezawa
We perform systematic investigation on the geometric, energetic and electronic properties of group IV-VI binary monolayers (XY), which are the counterparts of phosphorene, by emplo…
Tunable skewed edges in puckered structures
Marko M. Grujić, Motohiko Ezawa, Milan Ž. Tadić +1
We propose a new type of edges, arising due to the anisotropy inherent in the puckered structure of a honeycomb system such as in phosphorene. Skewed-zigzag and skewed-armchair nan…
Loop-nodal and Point-nodal Semimetals in Three-dimensional Honeycomb Lattices
Motohiko Ezawa
Honeycomb structure has a natural extension to the three dimensions. Simple examples are hyperhoneycomb and stripy-honeycomb lattices, which are realized in -LiIrO a…
High-topological-number magnetic skyrmions and topologically protected dissipative structure
Xichao Zhang, Yan Zhou, Motohiko Ezawa
The magnetic skyrmion with the topological number of unity () is a well-known nanometric swirling spin structure in the nonlinear model with the Dzyaloshinskii-Moriya inte…
Quantized Anomalous Hall Effects in Skyrmion Crystal
Keita Hamamoto, Motohiko Ezawa, Naoto Nagaosa
We theoretically study the quantized anomalous Hall effect (QAHE) in skyrmion crystal (SkX) without external magnetic field. The emergent magnetic field in SkX could be gigantic as…