6 papers
Spin-coherence characterization of boron vacancy defects in hexagonal boron nitride with broadband microwave pulses
Yuki Nakamura, Takuya Iwasaki, Shu Nakaharai +6
Negatively charged boron vacancy (VB-) defects in hexagonal boron nitride (hBN) are promising for nanoscale-proximity quantum sensing. To evaluate their performance, it is importan…
Hexagonal boron nitride/bilayer graphene moiré superlattices in the Dirac-material family: energy-band engineering and carrier doping by dual gating
Takuya Iwasaki, Yoshifumi Morita
We review the fabrication and transport characterization of hexagonal boron nitride (hBN)/Bernal bilayer graphene (BLG) moiré superlattices. Due to the moiré effect, the hBN/BLG…
Systematic investigation of dynamic nuclear polarization with boron vacancy in hexagonal boron nitride
Yuki Nakamura, Shunsuke Nishimura, Takuya Iwasaki +7
Dynamic nuclear polarization (DNP) using the boron vacancy () in hexagonal boron nitride (hBN) has gained increasing attention. Understanding this DNP requires syst…
Systematic characterization of nanoscale -BN quantum sensor spots created by helium-ion microscopy
Hao Gu, Moeta Tsukamoto, Yuki Nakamura +8
The nanosized boron vacancy () defect spot in hexagonal boron nitride (-BN) is promising for a local magnetic field quantum sensor. One of its advantages is that…
Bilayer Graphene on hexagonal Boron Nitride and the Family of quantum MetaMaterial
Takuya Iwasaki, Yoshifumi Morita
We report on the fabrication and characterization of dual-gated hexagonal boron nitride (hBN)/bilayer-graphene (BLG) superlattices. Due to the moire effect, the hBN/BLG superlattic…
Gapped Dirac materials and quantum valley currents in dual-gated hBN/bilayer-graphene heterostructures
Takuya Iwasaki, Yoshifumi Morita, Kenji Watanabe +1
In gapped Dirac materials, the topological current associated with each valley can flow in opposite directions creating long-range charge-neutral valley currents. We report valley…