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Title: Orbital order in FeSe: The case for vertex renormalization

Abstract

We study the structure of the orbital order Γ = † xzd xz - d yzd yz> in FeSe in light of recent scanning tunneling microscopy and angle-resolved photoemission spectroscopy (ARPES) data, which detect the shapes of the hole and electron pockets in the nematic phase. The geometry of the pockets indicates that the sign of Γ is different between the hole and electron pockets (Γ h and Γ e). We argue that this sign change cannot be reproduced if one solves for the orbital order within the mean-field approximation, as the mean-field analysis yields either no orbital order, or order with the same sign of Γ e and Γh. We argue that another solution with the opposite signs of Γ e and Γ h emerges if we include the renormalizations of the vertices in the d -wave orbital channel. We show that the ratio |Γ eh| is of order one, independent of the strength of the interaction. We also compute the temperature variation of the energy of d xz and d yz orbitals at the center of electron pockets and compare the results with ARPES data.

Authors:
 [1];  [2];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1466620
Alternate Identifier(s):
OSTI ID: 1461574
Report Number(s):
BNL-207975-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704; SC0014402
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Xing, Rui-Qi, Classen, Laura, and Chubukov, Andrey V. Orbital order in FeSe: The case for vertex renormalization. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.041108.
Xing, Rui-Qi, Classen, Laura, & Chubukov, Andrey V. Orbital order in FeSe: The case for vertex renormalization. United States. doi:10.1103/PhysRevB.98.041108.
Xing, Rui-Qi, Classen, Laura, and Chubukov, Andrey V. Tue . "Orbital order in FeSe: The case for vertex renormalization". United States. doi:10.1103/PhysRevB.98.041108. https://www.osti.gov/servlets/purl/1466620.
@article{osti_1466620,
title = {Orbital order in FeSe: The case for vertex renormalization},
author = {Xing, Rui-Qi and Classen, Laura and Chubukov, Andrey V.},
abstractNote = {We study the structure of the orbital order Γ = †xzdxz - d†yzdyz> in FeSe in light of recent scanning tunneling microscopy and angle-resolved photoemission spectroscopy (ARPES) data, which detect the shapes of the hole and electron pockets in the nematic phase. The geometry of the pockets indicates that the sign of Γ is different between the hole and electron pockets (Γh and Γe). We argue that this sign change cannot be reproduced if one solves for the orbital order within the mean-field approximation, as the mean-field analysis yields either no orbital order, or order with the same sign of Γe and Γh. We argue that another solution with the opposite signs of Γe and Γh emerges if we include the renormalizations of the vertices in the d -wave orbital channel. We show that the ratio |Γe/Γh| is of order one, independent of the strength of the interaction. We also compute the temperature variation of the energy of dxz and dyz orbitals at the center of electron pockets and compare the results with ARPES data.},
doi = {10.1103/PhysRevB.98.041108},
journal = {Physical Review B},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}

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Cited by: 3 works
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