TY - JOUR
T1 - Electromagnetic effects induced by a time-dependent axion field
AU - Taguchi, Katsuhisa
AU - Imaeda, Tatsushi
AU - Hajiri, Tetsuya
AU - Shiraishi, Takuya
AU - Tanaka, Yukio
AU - Kitajima, Naoya
AU - Naka, Tatsuhiro
N1 - Funding Information:
This work was supported by the institute for advanced research (IAR) in Nagoya University through a Grant-in-Aid. In addition, this work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas, Topological Material Science (No. JP15H05853), and a Grant-in-Aid for Challenging Exploratory Research (Grants No. JP15K13498 and No. 16K13803) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT). K.T. also gives thanks for the support of the Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology Corporation (JST) [JPMJCR14F1]. N.K. acknowledges the support by Grant-in-Aid for JSPS Fellows.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/6/11
Y1 - 2018/6/11
N2 - We studied the dynamics of the so-called θ term, which exists in topological materials and is related to a hypothetical field predicted by Peccei-Quinn in particle physics, in a magnetic superlattice constructed using a topological insulator and two ferromagnetic insulators, where the ferromagnetic insulators had perpendicular magnetic anisotropies and different magnetic coercive fields. We examined a way to drive the dynamics of the θ term in the magnetic superlattice through changing the inversion symmetry (from an antiparallel to a parallel magnetic configuration) using an external magnetic field. As a result, we found that unconventional electromagnetic fields, which are magnetic field-induced charge currents and vice versa, are generated by the nonzero dynamics of the θ term.
AB - We studied the dynamics of the so-called θ term, which exists in topological materials and is related to a hypothetical field predicted by Peccei-Quinn in particle physics, in a magnetic superlattice constructed using a topological insulator and two ferromagnetic insulators, where the ferromagnetic insulators had perpendicular magnetic anisotropies and different magnetic coercive fields. We examined a way to drive the dynamics of the θ term in the magnetic superlattice through changing the inversion symmetry (from an antiparallel to a parallel magnetic configuration) using an external magnetic field. As a result, we found that unconventional electromagnetic fields, which are magnetic field-induced charge currents and vice versa, are generated by the nonzero dynamics of the θ term.
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U2 - 10.1103/PhysRevB.97.214409
DO - 10.1103/PhysRevB.97.214409
M3 - Article
AN - SCOPUS:85048362442
SN - 2469-9950
VL - 97
JO - Physical Review B
JF - Physical Review B
IS - 21
M1 - 214409
ER -