TY - JOUR
T1 - Electric polarization in magnetic topological nodal semimetal thin films
AU - Ominato, Yuya
AU - Yamakage, Ai
AU - Nomura, Kentaro
N1 - Funding Information:
Funding: This work was supported by Kakenhi Grants-in-Aid (Nos. JP15H05851,JP15H05854 and JP17K05485) from the Japan Society for the Promotion of Science (JSPS) and JST CREST Grant Number JPMJCR18T2.
Funding Information:
This work was supported by Kakenhi Grants-in-Aid (Nos. JP15H05851,JP15H05854 and JP17K05485) from the Japan Society for the Promotion of Science (JSPS) and JST CREST Grant Number JPMJCR18T2.
Publisher Copyright:
© 2018 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2018/12
Y1 - 2018/12
N2 - We theoretically study the electric polarization in magnetic topological nodal semimetal thin films. In magnetically doped topological insulators, topological nodal semimetal phases emerge once the exchange coupling overcomes the band gap. Changing the magnetization direction, nodal structure is modulated and the system becomes topological nodal point or line semimetals. We find that nodal line semimetals are characterized by non-linear electric polarization, which is not observed in nodal point semimetals. The non-linear response originates from the existence of the surface states. Screening effect is self consistently included within a mean field approximation and the non-linear electric polarization is observed even in the presence of screening effect.
AB - We theoretically study the electric polarization in magnetic topological nodal semimetal thin films. In magnetically doped topological insulators, topological nodal semimetal phases emerge once the exchange coupling overcomes the band gap. Changing the magnetization direction, nodal structure is modulated and the system becomes topological nodal point or line semimetals. We find that nodal line semimetals are characterized by non-linear electric polarization, which is not observed in nodal point semimetals. The non-linear response originates from the existence of the surface states. Screening effect is self consistently included within a mean field approximation and the non-linear electric polarization is observed even in the presence of screening effect.
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U2 - 10.3390/condmat3040043
DO - 10.3390/condmat3040043
M3 - Article
AN - SCOPUS:85073069564
SN - 2410-3896
VL - 3
SP - 1
EP - 9
JO - Condensed Matter
JF - Condensed Matter
IS - 4
M1 - 43
ER -