Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C2 Symmetry Breaking in the Self-Energy

Seiichiro Onari, Youichi Yamakawa, Hiroshi Kontani

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

To understand the nematicity in Fe-based superconductors, nontrivial k dependence of the orbital polarization [ΔExz(k), ΔEyz(k)] in the nematic phase, such as the sign reversal of the orbital splitting between Γ and X, Y points in FeSe, provides significant information. To solve this problem, we study the spontaneous symmetry breaking with respect to the orbital polarization and spin susceptibility self-consistently. In FeSe, due to the sign-reversing orbital order, the hole and electron pockets are elongated along the ky and kx axes, respectively, consistently with experiments. In addition, an electron pocket splits into two Dirac cone Fermi pockets while increasing the orbital polarization. The orbital order in Fe-based superconductors originates from the strong positive feedback between the nematic orbital order and spin susceptibility.

Original languageEnglish
Article number227001
JournalPhysical Review Letters
Volume116
Issue number22
DOIs
Publication statusPublished - Jun 2 2016

Fingerprint

reversing
broken symmetry
orbitals
polarization
energy
magnetic permeability
positive feedback
cones
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C2 Symmetry Breaking in the Self-Energy. / Onari, Seiichiro; Yamakawa, Youichi; Kontani, Hiroshi.

In: Physical Review Letters, Vol. 116, No. 22, 227001, 02.06.2016.

Research output: Contribution to journalArticle

@article{ee8546c595fb4206bfd1a29c840f3c00,
title = "Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C2 Symmetry Breaking in the Self-Energy",
abstract = "To understand the nematicity in Fe-based superconductors, nontrivial k dependence of the orbital polarization [ΔExz(k), ΔEyz(k)] in the nematic phase, such as the sign reversal of the orbital splitting between Γ and X, Y points in FeSe, provides significant information. To solve this problem, we study the spontaneous symmetry breaking with respect to the orbital polarization and spin susceptibility self-consistently. In FeSe, due to the sign-reversing orbital order, the hole and electron pockets are elongated along the ky and kx axes, respectively, consistently with experiments. In addition, an electron pocket splits into two Dirac cone Fermi pockets while increasing the orbital polarization. The orbital order in Fe-based superconductors originates from the strong positive feedback between the nematic orbital order and spin susceptibility.",
author = "Seiichiro Onari and Youichi Yamakawa and Hiroshi Kontani",
year = "2016",
month = "6",
day = "2",
doi = "10.1103/PhysRevLett.116.227001",
language = "English",
volume = "116",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "22",

}

TY - JOUR

T1 - Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C2 Symmetry Breaking in the Self-Energy

AU - Onari, Seiichiro

AU - Yamakawa, Youichi

AU - Kontani, Hiroshi

PY - 2016/6/2

Y1 - 2016/6/2

N2 - To understand the nematicity in Fe-based superconductors, nontrivial k dependence of the orbital polarization [ΔExz(k), ΔEyz(k)] in the nematic phase, such as the sign reversal of the orbital splitting between Γ and X, Y points in FeSe, provides significant information. To solve this problem, we study the spontaneous symmetry breaking with respect to the orbital polarization and spin susceptibility self-consistently. In FeSe, due to the sign-reversing orbital order, the hole and electron pockets are elongated along the ky and kx axes, respectively, consistently with experiments. In addition, an electron pocket splits into two Dirac cone Fermi pockets while increasing the orbital polarization. The orbital order in Fe-based superconductors originates from the strong positive feedback between the nematic orbital order and spin susceptibility.

AB - To understand the nematicity in Fe-based superconductors, nontrivial k dependence of the orbital polarization [ΔExz(k), ΔEyz(k)] in the nematic phase, such as the sign reversal of the orbital splitting between Γ and X, Y points in FeSe, provides significant information. To solve this problem, we study the spontaneous symmetry breaking with respect to the orbital polarization and spin susceptibility self-consistently. In FeSe, due to the sign-reversing orbital order, the hole and electron pockets are elongated along the ky and kx axes, respectively, consistently with experiments. In addition, an electron pocket splits into two Dirac cone Fermi pockets while increasing the orbital polarization. The orbital order in Fe-based superconductors originates from the strong positive feedback between the nematic orbital order and spin susceptibility.

UR - http://www.scopus.com/inward/record.url?scp=84973320092&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84973320092&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.116.227001

DO - 10.1103/PhysRevLett.116.227001

M3 - Article

VL - 116

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 22

M1 - 227001

ER -