Predicted photoinduced pair annihilation of emergent magnetic charges in the organic salt α-(BEDT-TTF)2 I3 irradiated by linearly polarized light

Keisuke Kitayama*, Masahito Mochizuki, Yasuhiro Tanaka, Masao Ogata

*この研究の対応する著者

研究成果: Article査読

抄録

Prolonged experimental attempts to find magnetic monopoles (i.e., elementary particles with an isolated magnetic charge in three dimensions) have not yet been successful despite intensive efforts made since Dirac's proposal in 1931. Particle physicists have predicted the possible collision and pair annihilation of two magnetic charges with opposite signs. However, if such annihilation exists, its experimental observation would be difficult because its energy scale is predicted to be tremendously high (∼1016 GeV). In the present work, we theoretically predict using the Floquet theory that a pair of slightly gapped Dirac-cone bands in a weakly charge-ordered organic conductor α-(BEDT-TTF)2I3, which behave as magnetic charges with opposite signs in the momentum space, exhibit pair annihilation under irradiation with linearly polarized light. This photoinduced pair annihilation is accompanied by a nontopological phase transition to the Floquet normal insulator phase in contrast to the well-known circularly polarized-light-induced topological phase transition to the Floquet Chern insulator phase. We discuss that α-(BEDT-TTF)2I3 has a peculiar band structure capable of realizing a suitable experimental condition (i.e., off-resonant condition) and a charge-ordered state providing a required staggered site potential and thereby provides a rare example of materials that can be used to observe the predicted pair annihilation phenomenon. The feasibility of experimental observation is also discussed.

本文言語English
論文番号075127
ジャーナルPhysical Review B
104
7
DOI
出版ステータスPublished - 2021 8 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Predicted photoinduced pair annihilation of emergent magnetic charges in the organic salt α-(BEDT-TTF)2 I3 irradiated by linearly polarized light」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル