175 citations · 262 across the 9 of their papers we have counts for
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Illuminating the Bragg intersections as roots of Dirac nodal lines and high-order van Hove singularities
Ryosuke Akashi
We theoretically reexamine nearly uniform electron models with weak crystalline potentials. In particular, we theorize the modulation of the plane-wave branches at linear regions w…
Archetypical "push the band critical point" mechanism for peaking of the density of states in three-dimensional crystals: Theory and case study of cubic HS
Ryosuke Akashi
The point of zero gradient of the electronic band structure--critical point--generally induces the singularity in the density of states (DOS), but no isolated critical point yields…
First-principles study of phonon anharmonicity and negative thermal expansion in ScF3
Yusuke Oba, Terumasa Tadano, Ryosuke Akashi +1
The microscopic origin of the large negative thermal expansion of cubic scandium trifluorides (ScF3) is investigated by performing a set of anharmonic free-energy calculations base…
Modification of electronic structure and thermoelectric properties of hole-doped tungsten dichalcogenides
M. Kriener, A. Kikkawa, T. Suzuki +4
We present a study on the modification of the electronic structure and hole-doping effect for the layered dichalcogenide WSe_2 with a multi-valley band structure, where Ta is doped…
Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R MoS
Ryosuke Akashi, Masayuki Ochi, Sándor Bordács +4
We find that the motion of the valley electrons -- electronic states close to the and points of the Brillouin zone -- is confined into two dimension when the l…