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강상관계 물질 연구단
강상관계 물질 연구단
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Magnetic field induced topological semimetals near the quantum critical point of pyrochlore iridates

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Title
Magnetic field induced topological semimetals near the quantum critical point of pyrochlore iridates
Author(s)
Taekoo Oh; Hiroaki Ishizuka; Bohm-Jung Yang
Publication Date
2018-10
Journal
PHYSICAL REVIEW B, v.98, no.14, pp.144409-1 - 144409-21
Publisher
AMER PHYSICAL SOC
Abstract
Motivated by the recent experimental observation of anomalous magnetotransport properties near the Mott quantum critical point (QCP) of pyrochlore iridates, we study the generic topological band structure near QCP in the presence of magnetic field. We have found that the competition between different energy scales can generate various topological semimetal phases near QCP. Here the central role is played by the presence of a quadratic band crossing (QBC) with fourfold degeneracy in the paramagnetic band structure. Due to the large band degeneracy and strong spin-orbit coupling, the degenerate states at QBC can show an anisotropic Zeeman effect as well as the conventional isotropic Zeeman effect. Through the competition between three different magnetic energy scales including the exchange energy between Ir electrons and two Zeeman energies, various topological semimetals can be generated near QCP. Moreover, we have shown that these three magnetic energy scales can be controlled by modulating the magnetic multipole moment (MMM) of the cluster of spins in a unit cell, which can couple to the intrinsic MMM of the degenerate states at QBC. We propose the general topological band structure under magnetic field achievable near QCP, which would facilitate the experimental discovery of novel topological semimetal states in pyrochlore iridates. ©2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5129
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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