From band reconstruction to Bogoliubov dispersion: How dz2-band enhances iron-based superconductivity
Abstract
Conventional understanding of iron-based superconductivity is usually established based on electronic bands at the Fermi level, leaving deeper bands overlooked as potential factor. Here, we expand this view by demonstrating that a deep-lying dz2 band below the Fermi level can be employed to enhance the superconducting paring strength. By using scanning tunneling microscope to mechanically change the crystal lattice of an iron-based superconductor, we observe an upward shift of the deep-lying dz2 band related feature, leading to hybridization with the primary superconducting bands at the Fermi level. We visualize the novel evidence of this band hybridization and resulting enhanced superconducting gap through quasiparticle interference imaging, providing conclusive evidence that engineering such correlations between deep and pairing-active bands is a potent mechanism for amplifying the superconducting gap. This work refines the conventional view of pairing-relevant electronic structures and establishes band hybridization as an effective way to optimize superconducting materials.
Versions
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BibTeX
@misc{yan2026from,
title = {{From band reconstruction to Bogoliubov dispersion: How dz2-band enhances iron-based superconductivity}},
author = {Jingming Yan and Shendong Su and Guihao Jia and Yucong Peng and Xuanyu Long and Zheng Liu and Pei Ouyang and Qi-Kun Xue and Wei Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.11484},
eprint = {2610.11484},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.11484},
}
RIS
TY - UNPB
TI - From band reconstruction to Bogoliubov dispersion: How dz2-band enhances iron-based superconductivity
AU - Jingming Yan
AU - Shendong Su
AU - Guihao Jia
AU - Yucong Peng
AU - Xuanyu Long
AU - Zheng Liu
AU - Pei Ouyang
AU - Qi-Kun Xue
AU - Wei Li
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.11484
UR - https://arxiv.org/abs/2610.11484
AB - Conventional understanding of iron-based superconductivity is usually established based on electronic bands at the Fermi level, leaving deeper bands overlooked as potential factor. Here, we expand this view by demonstrating that a deep-lying dz2 band below the Fermi level can be employed to enhance the superconducting paring strength. By using scanning tunneling microscope to mechanically change the crystal lattice of an iron-based superconductor, we observe an upward shift of the deep-lying dz2 band related feature, leading to hybridization with the primary superconducting bands at the Fermi level. We visualize the novel evidence of this band hybridization and resulting enhanced superconducting gap through quasiparticle interference imaging, providing conclusive evidence that engineering such correlations between deep and pairing-active bands is a potent mechanism for amplifying the superconducting gap. This work refines the conventional view of pairing-relevant electronic structures and establishes band hybridization as an effective way to optimize superconducting materials.
ER -