156 citations · 971 across the 45 of their papers we have counts for
46 papers
Strain Correlated Linearly Polarized Photoluminescence in WS2/WSe2 Moiré Superlattices
Yuto Urano, Ryo Tamura, Yui Tamogami +6
Reliable optical control of valley degrees of freedom in moiré excitons requires that the emitted polarization faithfully reflect the underlying valley state. Here, we show that li…
Layer-selective proximity symmetry breaking enables anomalous and nonlinear Hall responses in -Nb ( S, Se, Te)
Yusuf Wicaksono, Toshikaze Kariyado
Nonlinear Hall responses provide an electrical probe of Berry-curvature dipoles, but they are symmetry forbidden in many pristine two-dimensional metals. We show that layer-selecti…
Moiré in -valley square lattice: Copper- and iron-based superconductor simulation in a single device
Toshikaze Kariyado, Yusuf Wicaksono, Ashvin Vishwanath +2
Novel superconducting phases have been found in various moiré heterostructures based on hexagonal lattices. However, the archetypal high-temperature superconductors (cuprates, iron…
Domain Wall Sliding-induced Polarization Switching in Multilayer Graphene
Zhou Zhou, Xiyao Peng, Jianfeng Bi +7
Electric polarization and metallicity are long believed not to coexist until the emergence of exceptionally rare material examples including the bulk polar metals and more recently…
Single-band square lattice Hubbard model from twisted bilayer C568
Toshikaze Kariyado, Ashvin Vishwanath, Zhu-Xi Luo
We propose twisted homobilayer of a carbon allotrope, C, to be a promising platform to realize controllable square lattice single-band extended Hubbard model. This setup ha…
Strongly hybridized phonons in one-dimensional van der Waals crystals
Shaoqi Sun, Qingyun Lin, Yihuan Li +7
The phenomena of pronounced electron-electron and electron-phonon interactions in one-dimensional (1D) systems are ubiquitous, which are well described by frameworks of Luttinger l…
Realization of topological phase in a chiral honeycomb lattice model
Genki Yonezawa, Jun-ichi Fukuda, Toshikaze Kariyado
We investigate topological properties of a chiral honeycomb lattice model with next-nearest-neighbor hoppings characterized by the reflection symmetry breaking. Topological nontriv…
Comment on "Absence of Topological Protection of the Interface States in Photonic Crystals"
Xing-Xiang Wang, Toshikaze Kariyado, Xiao Hu
In the Letter, Xu et al. reported that edge modes disappear in the expanded structure of Wu-Hu model characterized by topological index, while appear in the trivial…
Higher-order topology in honeycomb lattice with Y-Kekulé distortions
Yong-Cheng Jiang, Toshikaze Kariyado, Xiao Hu
We investigate higher-order topological states in honeycomb lattice with Y-Kekulé distortions that preserve crystalline symmetry. The gapped states in expanded and shrunke…
Possible gapless helical edge states in hydrogenated graphene
Yong-Cheng Jiang, Toshikaze Kariyado, Xiao Hu
Electronic band structures in hydrogenated graphene are theoretically investigated by means of first-principle calculations and an effective tight-binding model. It is shown that r…
Topological electronic states in holey graphyne
Yong-Cheng Jiang, Toshikaze Kariyado, Xiao Hu
We unveil that the holey graphyne (HGY), a two-dimensional carbon allotrope where benzene rings are connected by two CC bonds fabricated recently in a bottom-up way,…
Twisted bilayer BC: Valley interlocked anisotropic flat bands
Toshikaze Kariyado
Here we propose BC, a graphene derivative that has been synthesized, as a platform to realize exotic quantum phases by introducing a moiré pattern with mismatched stacking. In…
Topological magnon modes on honeycomb lattice with coupling textures
Hong Huang, Toshikaze Kariyado, Xiao Hu
Topological magnon modes are expected to be useful for novel applications such as robust information propagation, since they are immune to backscattering and robust against disorde…
Disentangling Orbital Magnetic Susceptibility with Wannier Functions
Toshikaze Kariyado, Hiroyasu Matsuura, Masao Ogata
Orbital magnetic susceptibility involves rich physics such as interband effects despite of its conceptual simplicity. In order to appreciate the rich physics related to the orbital…
Effective continuum model of twisted bilayer GeSe and origin of emerging one-dimensional mode
Manato Fujimoto, Toshikaze Kariyado
The electric structure of twisted bilayer GeSe, which shows a rectangular moiré pattern, is analyzed using a type effective continuum model. The effective model…
Giant orbital diamagnetism of three-dimensional Dirac electrons in SrPbO antiperovskite
S. Suetsugu, K. Kitagawa, T. Kariyado +5
In Dirac semimetals, inter-band mixing has been known theoretically to give rise to a giant orbital diamagnetism when the Fermi level is close to the Dirac point. In BiSb$…
Selective branching, quenching, and converting of topological modes
Toshikaze Kariyado, Robert-Jan Slager
A salient feature of topological phases are surface states and many of the widely studied physical properties are directly tied to their existence. Although less explored, a variet…
Flat band in twisted bilayer Bravais lattices
Toshikaze Kariyado, Ashvin Vishwanath
Band engineering in twisted bilayers of the five generic two-dimensional Bravais networks is demonstrated. We first derive symmetry-based constraints on the interlayer coupling, wh…
-fluxes, semi-metals and flat bands in artificial materials
Toshikaze Kariyado, Robert-Jan Slager
The possibility of engineering experimentally viable systems that realize gauge fluxes within plaquettes of hopping have been subject of search for decades due to vast amounts of t…
Many-body Chern number without integration
Koji Kudo, Haruki Watanabe, Toshikaze Kariyado +1
The celebrated work of Niu, Thouless, and Wu demonstrated the quantization of Hall conductance in the presence of many-body interactions by revealing the many-body counterpart of t…
Generating electromagnetic modes with fine tunable orbital angular momentum by planar topological circuits
Yuan Li, Yong Sun, Weiwei Zhu +5
Metamaterials made of periodic arrangements of electric permittivity and magnetic permeability and arrays of resonators can provide optic properties unexperienced in conventional m…
Topological Aspect of Graphene Patchwork with Regular Arrays of Nano Holes
Toshikaze Kariyado, Yongcheng Jiang, Hongxin Yang +1
Triangular and honeycomb lattices are dual to each other -- if we puncture holes into a featureless plane in a regular triangular alignment, the remaining body looks like a honeyco…
Weyl points of mechanical diamond
Yuta Takahashi, Toshikaze Kariyado, Yasuhiro Hatsugai
A spring-mass model arranged in a diamond structure --- mechanical diamond --- is analyzed in terms of topology in detail. We find that, additional springs connecting the next-near…
Berry Phases in Symmetry Protected Topological Phases
Toshikaze Kariyado, Takahiro Morimoto, Yasuhiro Hatsugai
We show that the Berry phase (Berry phase quantized into ) provides a useful tool to characterize symmetry protected topological phases with correlation that can be dir…