6 papers
Landau levels and magneto-optics in 30 quasi-periodic twisted bilayer graphene
Masaru Hitomi, Takuto Kawakami, Mikito Koshino
We develop a theoretical framework for Landau levels in quasi-periodic twisted bilayer graphene at a twist angle, a system without translational symmetry but possessing…
Quantum higher-spin Hall insulators
Takuto Kawakami, Igor Kuzmenko, Yshai Avishai +2
We develop a theory of quantum spin Hall insulators with arbitrary spin . Our analysis demonstrates that such systems support pairs of helical edge modes protec…
Twist-angle tunable Josephson junctions in three-dimensional superconductors
Tenta Tani, Takuto Kawakami, Mikito Koshino
We theoretically investigate the superconducting phase and perpendicular Josephson supercurrent in twisted three-dimensional (3D) superconductors, where two layered 3D materials ar…
Singular flat bands in three dimensions: Landau level spreading, quantum geometry, and Weyl reconstruction
Takuto Kawakami, Yuji Igarashi, Mikito Koshino
We theoretically investigate three-dimensional singular flat band systems, focusing on their quantum geometric properties and response to external magnetic fields. As a representat…
Moiré Band Engineering in Twisted Trilayer WSe2
Naoto Nakatsuji, Takuto Kawakami, Hayato Tateishi +2
We present a systematic theoretical study on the structural and electronic properties of twisted trilayer transition metal dichalcogenide (TMD) WSe, where two independent moiré…
Shift current response in twisted double bilayer graphenes
Takaaki V. Joya, Takuto Kawakami, Mikito Koshino
We calculate the shift current response in twisted double bilayer graphenes (TDBG) by applying the perturbative approach to the effective continuum Hamiltonian. We have performed a…