1 citations · 3 across the 13 of their papers we have counts for
14 papers
Momentum-selective graphene spectroscopy of moiré excitons
Katsunori Wakabayashi
Far-field photoluminescence probes only the light-cone corner of an exciton's momentum content, whereas energy transfer to nearby graphene integrates in-plane momenta up to the inv…
Graphene as a Tunable Nonradiative Bath for Moiré Excitons
Katsunori Wakabayashi
A minimal theory of nonradiative energy transfer from a two-dimensional (2D) moiré exciton to a nearby graphene layer is presented. From Fermi's golden rule the transfer rate is th…
Peak-Decomposition-Free Inverse Metrology of Hyperspectral Moiré Photoluminescence
Katsunori Wakabayashi
Hyperspectral photoluminescence (PL) of moiré transition-metal dichalcogenide heterobilayers encodes spatially varying exciton landscapes, but extracting that information is hamper…
Electrical Spectroscopy of Intervalley Relaxation in WSe Transistors
Katsunori Wakabayashi
We show that the transconductance of multilayer WSe field-effect transistors serves as a direct electrical spectrometer of the intervalley relaxation time , previou…
Hierarchical Disorder in Moiré Exciton Photoluminescence Probed by Spectral-Descriptor Correlations
Katsunori Wakabayashi
Hyperspectral photoluminescence (PL) maps of moiré transition-metal dichalcogenide heterobilayers encode rich information about the underlying disorder, but extracting it is hamper…
Transconductance as a Probe of Valley Thermodynamics in Multilayer WSe
Katsunori Wakabayashi, Souren Adhikary, Tomoaki Kameda
Transconductance is a central figure of merit in field-effect transistors, typically governed by charge accumulation and carrier mobility. In multilayer WSe transistors, howeve…
Valley-Landscape Engineering in Bilayer WSe Gate-All-Around Transistors
Katsunori Wakabayashi, Souren Adhikary, Kazuhito Tsukagoshi
The K- valence-band splitting that governs hole transport in few-layer WSe is not a fixed material constant. It is tuned by interlayer stacking, strain, pressure, a…
Shift current conductivity in monolayer SnS: a tight-binding analysis
Yuki Kusunoki, Tomoaki Kameda, Katsunori Wakabayashi
We investigate the bulk photovoltaic effect in monolayer SnS using an effective tight-binding model derived from first-principles calculations. By comparing short-range and long-ra…
Dilute Magnetism and Edge-State Engineering in Monolayer SnO
Yuya Fukuta, Souren Adhikary, Kazuhito Tsukagoshi +1
Tin monoxide (SnO) is a p-type oxide semiconductor whose electronic properties can be widely modified via atomic-scale engineering. Using density functional theory, we investigate…
Shaping Maximally Localized Wannier Functions via Discrete Adiabatic Transport
Yuji Hamai, Katsunori Wakabayashi
Maximally localized Wannier functions (MLWFs) are conventionally constructed by iteratively minimizing a spread functional over a high-dimensional gauge landscape. In this work, we…
Vacancy-driven inverse Lieb geometry: A general route to -wave altermagnetism in two dimensions
Geethanjali S, Katsunori Wakabayashi, Sasmita Mohakud
Vacancy-induced structural reconstruction provides a general microscopic route to -wave altermagnetism in two-dimensional systems. As a concrete realization, reconstructed $\mat…
Topological Charges, Fermi Arcs, and Surface States of Crystal
Shoya Yoshida, Katsuhiro Takahashi, Katsunori Wakabayashi
We investigate the topological electronic properties of the crystal by constructing a tight-binding model. The bulk band structure hosts Weyl nodes with higher and convention…
Identifying the phases of Kane-Mele Hubbard Hamiltonian in momentum space: A many-body configuration interaction study
Ranadeep Roy, Sasmita Mohakud, Katsunori Wakabayashi +1
We investigate the magnetic and conduction properties of Kane-Mele Hubbard model in quasi one-dimensional honeycomb ribbon systems at half-filling by varying the strength of both s…
Superconductivity in Ca-intercalated bilayer silicene
Jisvin Sam, Sasmita Mohakud, Katsunori Wakabayashi +1
Within first-principles calculations, we explore superconductivity in Ca-intercalated bilayer silicene compound, Si2CaSi2. This arises from the coupling of interlayer flower-like Γ…