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Condens. Matter 2018, 3(4), 43; https://doi.org/10.3390/condmat3040043

Electric Polarization in Magnetic Topological Nodal Semimetal Thin Films

1
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
3
Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
*
Author to whom correspondence should be addressed.
Received: 1 November 2018 / Revised: 23 November 2018 / Accepted: 28 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue Majorana Fermions and Topological Materials Science)
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Abstract

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. View Full-Text
Keywords: magnetic topological nodal semimetals; non-linear electric polarization; topological response magnetic topological nodal semimetals; non-linear electric polarization; topological response
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Ominato, Y.; Yamakage, A.; Nomura, K. Electric Polarization in Magnetic Topological Nodal Semimetal Thin Films. Condens. Matter 2018, 3, 43.

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