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Articles by Mikito Koshino
Electromagnetic response in dipole superfluids - Communications Physics
Abstract The Meissner effect is a hallmark of superconductivity arising from the interplay between charged superfluids and electromagnetic fields. However, superfluidity can also occur in systems of charge-neutral particles with magnetic or electric dipole moments, such as Bose-Einstein condensates of magnons or excitons. Despite this interest, the electromagnetic response of dipole superfluids, including potential analogues or contrasts to the Meissner effect, remains poorly understood.
Nonlinear Landau Fan Diagram for Graphene Electrons Exposed to a Moiré Potential
Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett.
Perpendicular electronic transport and moir\'e-induced resonance in twisted interfaces of three-dimensional graphite
We calculate the perpendicular electrical conductivity in twisted three-dimensional graphite (rotationally stacked graphite pieces) by using the effective continuum model and the recursive Green's function method. In the low twist angle regime (θ≲2∘), the conductivity shows a nonmonotonic dependence with a peak and dip structure as a function of the twist angle.
Multiscale Lattice Relaxation in General Twisted Trilayer Graphenes
Popular Summary Mismatches between two stacked atomic layers in a material can result in profound modifications of the system’s properties. Interest in such moiré materials has recently expanded to multilayer systems, where interference gives rise to a quasicrystalline supermoiré structure spanning tens of nanometers or more. However, from a theoretical standpoint, the analysis of such complex supermoiré structures presents a significant challenge for conventional analytical approaches.
Magnetic monopole becomes dyon in topological insulators
The Witten effect predicts that a magnetic monopole acquires a fractional electric charge inside topological insulators. In this work, we give a microscopic description of this phenomenon as well as an analogous two-dimensional system with a vortex. We solve the Dirac equation of electron field both analytically in a continuum and numerically on a lattice by adding the Wilson term and smearing the gauge field within a finite range to regularize the short-distance behavior of the system.
Topological domain walls in graphene nanoribbons with carrier doping
Abstract We theoretically study magnetic ground states of doped zigzag graphene nanoribbons and the emergence of topological domain walls. Using the Hartree-Fock mean-field approach and an effective continuum model, we demonstrated that the carrier doping stabilizes a magnetic structure with alternating antiferromagnetic domains, where the doped carriers are accommodated in topological bound states localized at the domain wall.
Moir\'e phonons in graphene/hexagonal boron nitride moir\'e superlattice
Abstract We theoretically study the in-plane acoustic phonons of graphene/hexagonal boron nitride moiré superlattice using a continuum model. We demonstrate that the original phonon bands of individual layers are strongly hybridized and reconstructed into moiré phonon bands consisting of dispersive bands and flat bands.
Perfect one-dimensional interface states in a twisted stack of three-dimensional topological insulators
Abstract We theoretically study the electronic structure of interface states in twisted stacks of three-dimensional topological insulators. When the center of the surface Dirac cone is located at a midpoint of a side of the Brillouin zone boundary, we find that an array of nearly independent one-dimensional channels is formed by the interface hybridization of the surface states, even when the moiré pattern itself is isotropic.
Hofstadter butterfly and the quantum Hall effect in twisted double bilayer graphene
Abstract We study the energy spectrum and quantum Hall effects of the twisted double bilayer graphene in uniform magnetic field. We investigate two different arrangements, AB-AB and AB-BA, which differ in the relative orientation but have very similar band structures in the absence of a magnetic field. For each system we calculate the energy spectrum and quantized Hall conductivities at each spectral gap by using a continuum Hamiltonian that satisfies the magnetotranslation condition.
Maximally Localized Wannier Orbitals and the Extended Hubbard Model for Twisted Bilayer Graphene
Abstract 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 continuum model and with the aid of the maximally localized algorithm, we construct the Wannier orbitals and obtain an effective tight-binding model on the emergent honeycomb lattice.
Symmetry, Maximally Localized Wannier States, and a Low-Energy Model for Twisted Bilayer Graphene Narrow Bands
Abstract We build symmetry-adapted maximally localized Wannier states and construct the low-energy tight-binding model for the four narrow bands of twisted bilayer graphene. We do so when the twist angle is commensurate near the “magic” value and the narrow bands are separated from the rest of the bands by energy gaps. On each layer and sublattice, every Wannier state has three peaks near the triangular moiré lattice sites.
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