Topological pair density waves in kagome superconductors
Abstract
The pair density wave (PDW) is an unconventional superconducting state exhibiting periodic pairing modulations due to pairing with finite momentum Q. In two dimensions, multiple Q components of the PDW can have a non-trivial relative phase, breaking time-reversal symmetry and resulting in a topological electronic structure. Here we review progress on exploring such topological PDWs (TPDWs) and discuss their potential realization in kagome superconductors. We first introduce the concept of a TPDW starting from the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and examine the challenges toward its realization. We then discuss the possibility of a TPDW in the kagome lattice, which intertwines with chiral superconductivity and loop currents, thus connecting to models describing the quantum anomalous Hall effect. Furthermore, we review the experimental signatures of a TPDW in AV3Sb5 (A = Cs, Rb, K) superconductors and highlight related quantum effects, including switchable chiral pairing modulations, Bogoliubov Fermi states, the superconducting diode effect, and the anomalous thermal Hall effect. Finally, we project the future research opportunities of this correlated topological quantum phase and discuss its broad implications for finite-momentum pairing, topological matter, and chiral superconductivity.
Versions
Related
- Majorana zero modes in half-quantum vortices of pair density wave superconductors
- Mode-selective electron-phonon coupling drives charge density waves in the kagome metals YRu3Si2 and LaRu3Si2
- Pair density waves via interband pairing --- a perspective from superfluid weight
- Pervasive electronic nematicity across the doping-tuned phase diagram of Kagome superconductors
- Resolving unconventional gap structure in kagome superconductors with hybrid microwave circuits
BibTeX
@misc{yin2026topological,
title = {{Topological pair density waves in kagome superconductors}},
author = {Jia-Xin Yin and Xianxin Wu and Mark H. Fischer and Xiao-Yu Yan and Yigui Zhong and Kozo Okazaki},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29156},
eprint = {2608.29156},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29156},
}
RIS
TY - UNPB
TI - Topological pair density waves in kagome superconductors
AU - Jia-Xin Yin
AU - Xianxin Wu
AU - Mark H. Fischer
AU - Xiao-Yu Yan
AU - Yigui Zhong
AU - Kozo Okazaki
PY - 2026
DA - 2026/08/29
PB - arXiv
DO - 10.48550/arxiv.2608.29156
UR - https://arxiv.org/abs/2608.29156
AB - The pair density wave (PDW) is an unconventional superconducting state exhibiting periodic pairing modulations due to pairing with finite momentum Q. In two dimensions, multiple Q components of the PDW can have a non-trivial relative phase, breaking time-reversal symmetry and resulting in a topological electronic structure. Here we review progress on exploring such topological PDWs (TPDWs) and discuss their potential realization in kagome superconductors. We first introduce the concept of a TPDW starting from the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and examine the challenges toward its realization. We then discuss the possibility of a TPDW in the kagome lattice, which intertwines with chiral superconductivity and loop currents, thus connecting to models describing the quantum anomalous Hall effect. Furthermore, we review the experimental signatures of a TPDW in AV3Sb5 (A = Cs, Rb, K) superconductors and highlight related quantum effects, including switchable chiral pairing modulations, Bogoliubov Fermi states, the superconducting diode effect, and the anomalous thermal Hall effect. Finally, we project the future research opportunities of this correlated topological quantum phase and discuss its broad implications for finite-momentum pairing, topological matter, and chiral superconductivity.
ER -