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Ferroelectricity in a magnon Bose-Einstein condensate: Nonreciprocal superfluidity, exceptional points, and Majorana bosons
Kazuki Yamamoto, Takuto Kawakami, Mikito Koshino
We investigate a ferroelectric instability of a magnon Bose-Einstein condensate, mediated by its interaction with an electric field through a geometric Aharonov-Casher (AC) phase.…
Emergent electronic insulating states in a one-dimensional moiré superlattice
Jianfeng Bi, Masaki Minamikawa, Ruige Dong +11
Two-dimensional (2D) van der Waals (vdW) moiré superlattices have provided a powerful knob to engineer a plethora of new quantum states. However, extending such moiré engineering t…
One-dimensional moiré engineering in zigzag graphene nanoribbons on hBN
Ryosuke Okumura, Naoto Nakatsuji, Takuto Kawakami +1
We study the structural relaxation and electronic properties of a one-dimensional (1D) moiré system composed of a zigzag graphene nanoribbon (GNR) placed on a hexagonal boron nitri…
Resonant Structure of Second Harmonic Generation in Multilayer Graphene Polytypes
Patrick Johansen Sarsfield, Takaaki V. Joya, Takuto Kawakami +2
Second harmonic generation (SHG) is a powerful optical tool for identifying non-centrosymmetric crystalline structures. Here, we analyze SHG in multilayer graphenes (MLG), with a f…
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…
Non-Abelian Chern band in rhombohedral graphene multilayers
Taketo Uchida, Takuto Kawakami, Mikito Koshino
Moiré flat bands in rhombohedral multilayer graphene provide a platform for exploring interaction-driven topological phases, where a single isolated band often forms a Chern band.…