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Emergence of topological semimetals in gap closing in semiconductors without inversion symmetry
Shuichi Murakami, Motoaki Hirayama, Ryo Okugawa +1
A band gap for electronic states in crystals governs various properties of solids, such as transport, optical and magnetic properties. Its estimation and control have been an impor…
Theory of intraband plasmons in doped carbon nanotubes: rolled surface-plasmons of graphene
Ken-ichi Sasaki, Shuichi Murakami, Hideki Yamamoto
A single-wall carbon nanotube possesses two different types of plasmons specified by the wavenumbers in the azimuthal and axial directions. The azimuthal plasmon that is caused by…
Determination of intrinsic lifetime of edge magnetoplasmons
Ken-ichi Sasaki, Shuichi Murakami, Yasuhiro Tokura +1
It is known that peculiar plasmons whose frequencies are purely imaginary exist in the interior of a two-dimensional electronic system described by the Drude model. We show that wh…
Topological Dirac Nodal Lines and Surface Charges in fcc Alkaline Earth Metals
Motoaki Hirayama, Ryo Okugawa, Takashi Miyake +1
In nodal-line semimetals, the gaps close along loops in space, which are not at high-symmetry points. Typical mechanisms for the emergence of nodal lines involve mirror s…