286 citations · 2.3k across the 59 of their papers we have counts for
47 papers · 1 filter
Janus-induced atomic reconstruction amplifies twist-angle modulation of interlayer thermal transport in moiré bilayers
Bin Xu, Rulei Guo, Jie Sun +8
In two-dimensional moiré bilayers, atomic reconstruction, the spontaneous structural relaxation toward energy-minimizing stacking registries in the near-commensurate regime, can st…
One-Dimensional Electronic States in a Moiré Superlattice of Twisted Bilayer WTe2
Takuto Kawakami, Hayato Tateish, Daiki Yoshida +10
One-dimensional (1D) moiré superlattices provide a new route to engineering reduced-dimensional electronic states in van der Waals materials, yet their electronic structure and mic…
Tunneling photo-thermoelectric effect in monolayer graphene/bilayer hexagonal boron nitride/bilayer graphene asymmetric van der Waals tunnel junctions
Sabin Park, Rai Moriya, Yijin Zhang +3
Graphene is known to exhibit a pronounced photo-thermoelectric effect (PTE) in its in-plane carrier transport and attracting attention toward various optoelectronic applications. I…
Observation of phonon Poiseuille flow in isotopically-purified graphite ribbons
Xin Huang, Yangyu Guo, Yunhui Wu +7
In recent times, the unique collective transport physics of phonon hydrodynamics motivates theoreticians and experimentalists to explore it in micro- and nanoscale and at elevated…
Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-time-scale pump-and-probe spectroscopy
Takashi Kuroda, Yusuke Hoshi, Satoru Masubuchi +5
The luminescence yield of transition metal dichalcogenide monolayers frequently suffers from the formation of long-lived dark states, which include excitons with intervalley charge…
Detection of cyclotron resonance using photo-induced thermionic emission at graphene/MoS2 van der Waals interface
Yusai Wakafuji, Rai Moriya, Sabin Park +5
We demonstrate the detection of cyclotron resonance in graphene by using a photo-induced thermionic emission mechanism at the graphene/MoS2 van der Waals (vdW) Schottky junction. A…
Photo-Nernst detection of cyclotron resonance in partially irradiated graphene
Kei Kinoshita, Rai Moriya, Satoru Masubuchi +3
Cyclotron resonance of a Landau-quantized graphene can absorb significant amount of infrared light. However, application of this phenomenon to the photodetector had been limited du…
Optical coupling between atomically-thin black phosphorus and a two dimensional photonic crystal nanocavity
Yasutomo Ota, Rai Moriya, Naoto Yabuki +5
Atomically-thin black phosphorus (BP) is an emerging two dimensional (2D) material exhibiting bright photoluminescence in the near infrared. Coupling its radiation to photonic nano…
Photo-thermoelectric detection of cyclotron resonance in asymmetrically carrier-doped graphene two-terminal device
Kei Kinoshita, Rai Moriya, Miho Arai +4
Graphene is known to show a significant photo-thermoelectric effect that can exceed its photovoltaic contribution. Here, by utilizing this effect, we demonstrate a photovoltage mea…
Heat transfer at the van der Waals interface between graphene and NbSe2
Yohta Sata, Rai Moriya, Naoto Yabuki +2
Graphene has been widely used to construct low-resistance van der Waals (vdW) contacts to other two-dimensional (2D) materials. However, a rise of electron temperature of the graph…
Imaging bulk and edge transport near the Dirac point in graphene moiré superlattices
Ziwei Dou, Sei Morikawa, Alessandro Cresti +9
Van der Waals structures formed by aligning monolayer graphene with insulating layers of hexagonal boron nitride exhibit a moiré superlattice that is expected to break sublattice s…
Inter-subband Landau level couplings induced by in-plane magnetic fields in trilayer graphene
Yuta Asakawa, Satoru Masubuchi, Naoko Inoue +4
We observed broken-symmetry quantum Hall effects and level crossings between spin- and valley- resolved Landau levels (LLs) in Bernal stacked trilayer graphene. When the magnetic f…
Exfoliation and van der Waals heterostructure assembly of intercalated ferromagnet Cr1/3TaS2
Yuji Yamasaki, Rai Moriya, Miho Arai +5
Ferromagnetic van der Waals (vdW) materials are in demand for spintronic devices with all-two-dimensional-materials heterostructures. Here, we demonstrate mechanical exfoliation of…
N- and p-type carrier injections into WSe2 with van der Waals contacts of two-dimensional materials
Yohta Sata, Rai Moriya, Satoru Masubuchi +3
We demonstrated n-type and p-type carrier injections into a transition metal dichalcogenide (TMD) WSe2 using van der Waals (vdW) contacts of two-dimensional (2D) materials: graphit…
Dirac fermion reflector by ballistic graphene sawtooth-shaped npn junctions
Sei Morikawa, Quentin Wilmart, Satoru Masubuchi +4
We have realized a Dirac fermion reflector in graphene by controlling the ballistic carrier trajectory in a sawtooth-shaped npn junction. When the carrier density in the inner p-re…
Construction of van der Waals magnetic tunnel junction using ferromagnetic layered dichalcogenide
Miho Arai, Rai Moriya, Naoto Yabuki +3
We investigate the micromechanical exfoliation and van der Waals (vdW) assembly of ferromagnetic layered dichalcogenide Fe0.25TaS2. The vdW interlayer coupling at the Fe-intercalat…
Imaging ballistic carrier trajectories in graphene using scanning gate microscopy
Sei Morikawa, Ziwei Dou, Shu-Wei Wang +6
We use scanning gate microscopy to map out the trajectories of ballistic carriers in high-mobility graphene encapsulated by hexagonal boron nitride and subject to a weak magnetic f…
Electric field modulation of Schottky barrier height in graphene/MoSe2 van der Waals heterointerface
Yohta Sata, Rai Moriya, Sei Morikawa +3
We demonstrate a vertical field-effect transistor based on a graphene/MoSe2 van der Waals (vdW) heterostructure. The vdW interface between the graphene and MoSe2 exhibits a Schottk…
Influence of the density of states of graphene on the transport properties of graphene/MoS2/metal vertical field-effect transistors
Rai Moriya, Takehiro Yamaguchi, Yoshihisa Inoue +4
We performed detailed studies of the current-voltage characteristics in graphene/MoS2/metal vertical field-effect transistors. Owing to its low density of states, the Fermi level i…
Edge-channel interferometer at the graphene quantum Hall pn junction
Sei Morikawa, Satoru Masubuchi, Rai Moriya +3
We demonstrate a quantum Hall edge-channel interferometer in a high-quality graphene pn junction under a high magnetic field. The co-propagating p and n quantum Hall edge channels…
Modulation of Schottky barrier height in graphene/MoS2/metal vertical heterostructure with large current ON-OFF ratio
Yohta Sata, Rai Moriya, Takehiro Yamaguchi +5
Detail transport properties of graphene/MoS2/metal vertical heterostructure have been investigated. The van der Waals interface between the graphene and MoS2 exhibits Schottky barr…
Tunneling transport in a few monolayer-thick WS2/graphene heterojunction
Takehiro Yamaguchi, Rai Moriya, Yoshihisa Inoue +5
This paper demonstrates the high-quality tunnel barrier characteristics and layer number controlled tunnel resistance of a transition metal dichalcogenide (TMD) measuring just a fe…
Large current modulation in exfoliated-graphene/MoS2/metal vertical heterostructures
Rai Moriya, Takehiro Yamaguchi, Yoshihisa Inoue +4
Graphene-based vertical field effect transistors have attracted considerable attention in the light of realizing high-speed switching devices; however, the functionality of such de…
Cubic Rashba spin-orbit interaction of two-dimensional hole gas in strained-Ge/SiGe quantum well
Rai Moriya, Kentarou Sawano, Yusuke Hoshi +8
The spin-orbit interaction (SOI) of the two-dimensional hole gas in the inversion symmetric semiconductor Ge is studied in a strained-Ge/SiGe quantum well structure. We observed we…