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강상관계 물질 연구단
강상관계 물질 연구단
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Two-dimensional Peierls instability via zone-boundary Dirac line nodes in layered perovskite oxides

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Title
Two-dimensional Peierls instability via zone-boundary Dirac line nodes in layered perovskite oxides
Author(s)
Jin-Hong Park; Seung Hun Lee; Choong H. Kim; Hosub Jin; Bohm-Jung Yang
Publication Date
2019-05
Journal
PHYSICAL REVIEW B, v.99, no.19, pp.195107 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 American Physical Society. Interplay of Fermi surface topology and electron correlation is the quintessential ingredient underlying spontaneous symmetry breaking in itinerant electronic systems. In one-dimensional (1D) systems at half filling, the inherent Fermi surface nesting makes the translationally invariant metallic state unstable, which is known as Peierls instability. Extending the scope of Peierls instability to two (2D) or three dimensions (3D), however, is not straightforward, since the Fermi surface in higher dimensions is generally not nested. In this work, we show that a perfectly nested Fermi surface can be realized in a class of 2D perovskite oxides, giving rise to 2D Peierls instability. Here the central role is played by the zone-boundary Dirac line node (DLN) protected by two orthogonal glide mirrors induced by the rotation of oxygen octahedra. Especially at a critical angle of the octahedron rotation, the zone-boundary DLN flattens, leading to logarithmically diverging susceptibility. We propose the 2D Peierls instability driven by dispersionless DLN as a principle mechanism for spontaneous symmetry breaking in various layered perovskite oxides including the antiferromagnetism of Sr2IrO4. As a clear signature of the 2D Peierls instability, we predict that the magnetic domain wall in Sr2IrO4 hosts localized soliton modes
URI
https://pr.ibs.re.kr/handle/8788114/6468
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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