43 citations · 177 across the 10 of their papers we have counts for
10 papers
Magnetic field imaging by hBN quantum sensor nanoarray
Kento Sasaki, Yuki Nakamura, Hao Gu +8
Placing a sensor close to the target at the nano-level is a central challenge in quantum sensing. We demonstrate high-spatial-resolution magnetic field imaging with a boron vacancy…
Plasmon triggered ultrafast operation of color centers in hBN layers
Vasilios Karanikolas, Takuya Iwasaki, Joel Henzie +6
High-quality emission centers in two-dimensional materials are promising components for future photonic and optoelectronic applications. Carbon-enriched hexagonal boron nitride (hB…
Dual-gated hBN/bilayer-graphene superlattices and the transitions between the insulating phases at the charge neutrality point
Takuya Iwasaki, Yoshifumi Morita, Kenji Watanabe +1
We report on transport properties in dual-gated hexagonal boron nitride (hBN)/bilayer-graphene (BLG) superlattices. Here, BLG is nontwisted, i.e., plain. This paper focuses on the…
Electron transport in folded bilayer-bilayer graphene/hexagonal boron nitride superlattices under high magnetic fields
Takuya Iwasaki, Motoi Kimata, Yoshifumi Morita +7
Employing graphene as a template, we fabricate moiré superlattices by stacking bilayer or folded bilayer-bilayer graphene (BLG or fBBLG) and hexagonal boron nitride (hBN), i.e., hB…
Direct growth of germanene at interfaces between van der Waals materials and Ag(111)
Seiya Suzuki, Takuya Iwasaki, K. Kanishka H. De Silva +7
Germanene, a two-dimensional honeycomb germanium crystal, is grown at graphene/Ag(111) and hexagonal boron nitride (h-BN)/Ag(111) interfaces by segregating germanium atoms. A simpl…
Light-Assisted and Gate-Tunable Oxygen Gas Sensor based on Rhenium Disulfide (ReS2) Field-Effect Transistors
Amir Zulkefli, Bablu Mukherjee, Ryoma Hayakawa +3
Gas sensors based on transition metal dichalcogenides (TMDCs) have attracted much attention from a new perspective involving light-assisted or gate-voltage operation. However, thei…
Single-Carrier Transport in Graphene/hBN Superlattices
Takuya Iwasaki, Shu Nakaharai, Yutaka Wakayama +4
Graphene/hexagonal boron nitride (hBN) moiré superlattices have attracted interest for use in the study of many-body effects and fractal physics in Dirac fermion systems. Many exot…
Topological Valley Currents in Bilayer Graphene/Hexagonal Boron Nitride Superlattices
Kosuke Endo, Katsuyoshi Komatsu, Takuya Iwasaki +8
Graphene superlattices have recently been attracting growing interest as an emergent class of quantum metamaterials. In this paper, we report the observation of nonlocal transport…
Fabry-Pérot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts
Nurul Fariha Ahmad, Katsuyoshi Komatsu, Takuya Iwasaki +8
We report on the observation of quantum transport and interference in a graphene device that is attached with a pair of split gates to form an electrostatically-defined quantum poi…
Observation of superconductivity in bilayer graphene/hexagonal boron nitride superlattices
Satoshi Moriyama, Yoshifumi Morita, Katsuyoshi Komatsu +9
A class of low-dimensional superconductivity (SC), such as most of "atomic-layer" SCs, has survived only under certain circumstances, implying a role of the substrate. Moreover, in…