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Spin Hall effect in 2D metallic delafossite PtCoO and vicinity topology
Sota Kitamura, Hidetomo Usui, Robert-Jan Slager +9
The two-dimensional (2D) metal PtCoO is renowned for the lowest room temperature resistivity among all oxides, close to that of the top two materials Ag and Cu. In addition, we…
Maximally-localized Wannier orbitals and the extended Hubbard model for the twisted bilayer graphene
Mikito Koshino, Noah F. Q. Yuan, Takashi Koretsune +3
We develop an effective extended Hubbard model to describe the low-energy electronic properties of the twisted bilayer graphene. By using the Bloch states in the effective continuu…
Superconductivity in quantum-dot superlattices composed of quantum wire networks
Takashi Kimura, Hiroyuki Tamura, Kazuhiko Kuroki +3
Based on calculations using the local density approximation, we propose quantum wire networks with square and plaquette type lattice structures that form quantum dot superlattices.…
Phase Diagram for the Hofstadter butterfly and integer quantum Hall effect in three dimensions
M. Koshino, H. Aoki, T. Osada +2
We give a perspective on the Hofstadter butterfly (fractal energy spectrum in magnetic fields), which we have shown to arise specifically in three-dimensional(3D) systems in our pr…
Hofstadter butterfly and integer quantum Hall effect in three dimensions
M. Koshino, H. Aoki, K. Kuroki +2
For a three-dimensional lattice in magnetic fields we have shown that the hopping along the third direction, which normally tends to smear out the Landau quantization gaps, can rat…