Motivated by the observation of a pair density wave (PDW) in the kagome metal CsV3Sb5, we consider the fate of electrons near a p-type Van Hove singularity (vHS) of the kagome lattice with on-site Hubbard U and the nearest-neighbor repulsion V. We study the effect of such interactions on Fermi surface “patches” at the vHS. We show how a feature unique to the kagome lattice known as sublattice interference crucially affects the form of the interactions among the patches. The renormalization group (RG) flow of such interactions results in a regime where the nearest-neighbor interaction V exceeds the on-site repulsion U. We identify this condition as being favorable for the formation of charge-density-wave (CDW) and PDW orders. In the weak-coupling limit, we find a complex CDW order as the leading instability, which breaks time-reversal symmetry. Beyond RG, we perform a Hartree-Fock study to a V-only model and find the pair-density-wave order indeed sets in at some intermediate coupling.
Description
Phys. Rev. B 108, L081117 (2023) - Sublattice interference promotes pair density wave order in kagome metals
%0 Journal Article
%1 PhysRevB.108.L081117
%A Wu, Yi-Ming
%A Thomale, Ronny
%A Raghu, S.
%D 2023
%I American Physical Society
%J Phys. Rev. B
%K a
%N 8
%P L081117
%R 10.1103/PhysRevB.108.L081117
%T Sublattice interference promotes pair density wave order in kagome metals
%U https://link.aps.org/doi/10.1103/PhysRevB.108.L081117
%V 108
%X Motivated by the observation of a pair density wave (PDW) in the kagome metal CsV3Sb5, we consider the fate of electrons near a p-type Van Hove singularity (vHS) of the kagome lattice with on-site Hubbard U and the nearest-neighbor repulsion V. We study the effect of such interactions on Fermi surface “patches” at the vHS. We show how a feature unique to the kagome lattice known as sublattice interference crucially affects the form of the interactions among the patches. The renormalization group (RG) flow of such interactions results in a regime where the nearest-neighbor interaction V exceeds the on-site repulsion U. We identify this condition as being favorable for the formation of charge-density-wave (CDW) and PDW orders. In the weak-coupling limit, we find a complex CDW order as the leading instability, which breaks time-reversal symmetry. Beyond RG, we perform a Hartree-Fock study to a V-only model and find the pair-density-wave order indeed sets in at some intermediate coupling.
@article{PhysRevB.108.L081117,
abstract = {Motivated by the observation of a pair density wave (PDW) in the kagome metal CsV3Sb5, we consider the fate of electrons near a p-type Van Hove singularity (vHS) of the kagome lattice with on-site Hubbard U and the nearest-neighbor repulsion V. We study the effect of such interactions on Fermi surface “patches” at the vHS. We show how a feature unique to the kagome lattice known as sublattice interference crucially affects the form of the interactions among the patches. The renormalization group (RG) flow of such interactions results in a regime where the nearest-neighbor interaction V exceeds the on-site repulsion U. We identify this condition as being favorable for the formation of charge-density-wave (CDW) and PDW orders. In the weak-coupling limit, we find a complex CDW order as the leading instability, which breaks time-reversal symmetry. Beyond RG, we perform a Hartree-Fock study to a V-only model and find the pair-density-wave order indeed sets in at some intermediate coupling.},
added-at = {2023-09-08T08:04:19.000+0200},
author = {Wu, Yi-Ming and Thomale, Ronny and Raghu, S.},
biburl = {https://www.bibsonomy.org/bibtex/2fb74841c029036ae3cef2752649923d3/ctqmat},
day = 22,
description = {Phys. Rev. B 108, L081117 (2023) - Sublattice interference promotes pair density wave order in kagome metals},
doi = {10.1103/PhysRevB.108.L081117},
interhash = {5126d01e2e020633ecb1e7644005e27a},
intrahash = {fb74841c029036ae3cef2752649923d3},
journal = {Phys. Rev. B},
keywords = {a},
month = {08},
number = 8,
numpages = {6},
pages = {L081117},
publisher = {American Physical Society},
timestamp = {2023-10-31T11:13:01.000+0100},
title = {Sublattice interference promotes pair density wave order in kagome metals},
url = {https://link.aps.org/doi/10.1103/PhysRevB.108.L081117},
volume = 108,
year = 2023
}