2024-03-28T19:49:16Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00023097
2023-01-16T04:12:46Z
336:695:696
Topological Domain Wall and Valley Hall Effect in Charge Ordered Phase of Molecular Dirac Fermion System α-(BEDT-TTF)2I3
Matsuno, Genki
Omori, Yukiko
Eguchi, Takaaki
Kobayashi, Akito
open access
Copyright ©2016 The Physical Society of Japan 日本物理学会
The topological domain wall and valley Hall effect are theoretically investigated in the molecular conductor α-(BEDT-TTF)2I3. By using the mean-field theory in an extended Hubbard model, it is demonstrated under a cylinder boundary condition that a domain wall emerges in the charge ordered phase, and exhibits a topological nature near the phase transition to the massless Dirac Fermion phase. The topological nature is well characterized by the Berry curvature, which has opposite signs in two charge ordered phases divided by the domain wall, and gives rise to the valley Hall conductivity with opposite signs, enabling these phases to be distinguished. It is also found that the valley Hall conductivity in the tilted Dirac cones exhibits a characteristic double-peak structure as a function of chemical potential using the semi classical formalism.
日本物理学会
2016-09-15
eng
journal article
AM
http://hdl.handle.net/2237/25287
https://nagoya.repo.nii.ac.jp/records/23097
https://doi.org/10.7566/JPSJ.85.094710
0031-9015
Journal of the Physical Society of Japan
85
094710
094710
https://nagoya.repo.nii.ac.jp/record/23097/files/67542.pdf
application/pdf
1.1 MB
2017-09-15