Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Senga, Ryosuke"'
Autor:
Unzog, Martin, Tal, Alexey, Melo, Pedro, Senga, Ryosuke, Suenaga, Kazu, Pichler, Thomas, Kresse, Georg
We investigate the relationship between the K-edge fine structure of isolated single-wall carbon nanotubes (SWCNTs) and the Van Hove singularities (VHSs) in the conduction band density of states. To this end, we model X-ray absorption spectra of SWCN
Externí odkaz:
http://arxiv.org/abs/2409.17619
Autor:
Guandalini, Alberto, Senga, Ryosuke, Lin, Yung-Chang, Suenaga, Kazu, Barone, Paolo, Mauri, Francesco, Pichler, Thomas, Kramberger, Christian
In transmission electron energy-loss spectroscopy, the cross section in 2D is quenched by kinematic effects once the momentum transfer becomes smaller than a critical value set by $q_z$, the momentum loss parallel to the beam. Our highly momentum ($\
Externí odkaz:
http://arxiv.org/abs/2406.02998
Autor:
Senga, Ryosuke, Lin, Yung-Chang, Morishita, Shigeyuki, Kato, Ryuichi, Yamada, Takatoshi, Hasegawa, Masataka, Suenaga, Kazu
Publikováno v:
Nature 603 (2022) 68
The spatial resolutions of even the most sensitive isotope analysis techniques based on light or ion probes are limited to a few hundred nanometres. Although vibration spectroscopy using electron probes has achieved higher spatial resolution, the det
Externí odkaz:
http://arxiv.org/abs/2306.15861
Autor:
Guandalini, Alberto, Senga, Ryosuke, Lin, Yung-Chang, Suenaga, Kazu, Ferretti, Andrea, Varsano, Daniele, Recchia, Andrea, Barone, Paolo, Mauri, Francesco, Pichler, Thomas, Kramberger, Christian
In this work we perform electron energy-loss spectroscopy (EELS) of freestanding graphene with high energy and momentum resolution to disentangle the quasielastic scattering from the excitation gap of Dirac electrons close to the optical limit. We sh
Externí odkaz:
http://arxiv.org/abs/2302.06367
Rich valleytronics and diverse defect-induced or interlayer pre-bandgap excitonics have been extensively studied in transition metal dichalcogenides (TMDCs), a system with fascinating optical physics. However, more intense high-energy absorption peak
Externí odkaz:
http://arxiv.org/abs/2104.00291
Physical property of a single quantum object is governed by its precise atomic arrangement. The direct correlation of localized physical properties with the atomic structures has been therefore strongly desired but still limited in the theoretical st
Externí odkaz:
http://arxiv.org/abs/2101.11830
Publikováno v:
Phys. Rev. Lett. 124, 087401 (2020)
Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q val
Externí odkaz:
http://arxiv.org/abs/1909.06033
Momentum Conserved Ultrafast Charge Transfer Dynamics of Interlayer Excitons in vdW Heterostructures
Autor:
Gogoi, Pranjal Kumar, Lin, Yung-Chang, Senga, Ryosuke, Komsa, Hannu-Pekka, Wong, Swee Liang, Chi, Dongzhi, Krasheninnikov, Arkady V., Li, Lain-Jong, Breese, Mark B. H., Pennycook, Steven J., Wee, Andrew T. S., Suenaga, Kazu
Heterostructures comprising van der Waals (vdW) stacked transition metal dichalcogenide (TMDC) monolayers are a fascinating class of two-dimensional (2D) materials with unique properties. The presence of interlayer excitons, where the electron and th
Externí odkaz:
http://arxiv.org/abs/1902.00461
Autor:
Senga, Ryosuke, Suenaga, Kazu, Barone, Paolo, Morishita, Shigeyuki, Mauri, Francesco, Pichler, Thomas
Propagating atomic vibrational waves, phonons, rule important thermal, mechanical, optoelectronic and transport characteristics of materials. Thus the knowledge of phonon dispersion, namely the dependence of vibrational energy on momentum is a key in
Externí odkaz:
http://arxiv.org/abs/1812.08294
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