Controlling Intertwined Electronic Orders in FeSe with Exfoliation
Abstract
Controlling intertwined electronic orders in two-dimensional superconductors offers an effective route to answering fundamental questions and engineering new quantum devices. However, tuning the balance between competing orders typically requires complex chemistry, strain, or interface engineering. Here, we show that a pristine alternative is the dimensional reduction of the unconventional superconductor FeSe. Exfoliation suppresses the bulk electronic nematic response and switches the superconducting symmetry from bulk s-wave to d-wave-dominant. Transport, electron microscopy, and Raman spectroscopy establish the substantial weakening of nematic order in thin flakes. To probe superconductivity, we perform angle-dependent Andreev reflection spectroscopy on pristine crystal edges. As the junction's orientation is rotated, the spectra evolve from zero-energy bound states to coherence peaks. The injection angle, field, and temperature dependence, along with theoretical modeling, confirm that exfoliation switches the superconducting symmetry. Our results suggest a versatile superconducting platform for engineering quantum orders and provide fresh insights into the underlying pairing mechanisms.
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BibTeX
@misc{liu2026controlling,
title = {{Controlling Intertwined Electronic Orders in FeSe with Exfoliation}},
author = {Wenyao Liu and Gabriel Natale and Kyung-Mo Kim and Birender Singh and Piyush Sakrikar and Stephen D. Funni and Leo Kondo and Augustin Davignon and Antoine de Lagrave and Kota Ishihara and Michael Geiwitz and Maia G. Vergniory and Takasada Shibauchi and Jun Sung Kim and Michał Papaj and Judy J. Cha and Kenneth S. Burch†},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29407},
eprint = {2608.29407},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29407},
}
RIS
TY - UNPB
TI - Controlling Intertwined Electronic Orders in FeSe with Exfoliation
AU - Wenyao Liu
AU - Gabriel Natale
AU - Kyung-Mo Kim
AU - Birender Singh
AU - Piyush Sakrikar
AU - Stephen D. Funni
AU - Leo Kondo
AU - Augustin Davignon
AU - Antoine de Lagrave
AU - Kota Ishihara
AU - Michael Geiwitz
AU - Maia G. Vergniory
AU - Takasada Shibauchi
AU - Jun Sung Kim
AU - Michał Papaj
AU - Judy J. Cha
AU - Kenneth S. Burch†
PY - 2026
DA - 2026/08/29
PB - arXiv
DO - 10.48550/arxiv.2608.29407
UR - https://arxiv.org/abs/2608.29407
AB - Controlling intertwined electronic orders in two-dimensional superconductors offers an effective route to answering fundamental questions and engineering new quantum devices. However, tuning the balance between competing orders typically requires complex chemistry, strain, or interface engineering. Here, we show that a pristine alternative is the dimensional reduction of the unconventional superconductor FeSe. Exfoliation suppresses the bulk electronic nematic response and switches the superconducting symmetry from bulk s-wave to d-wave-dominant. Transport, electron microscopy, and Raman spectroscopy establish the substantial weakening of nematic order in thin flakes. To probe superconductivity, we perform angle-dependent Andreev reflection spectroscopy on pristine crystal edges. As the junction's orientation is rotated, the spectra evolve from zero-energy bound states to coherence peaks. The injection angle, field, and temperature dependence, along with theoretical modeling, confirm that exfoliation switches the superconducting symmetry. Our results suggest a versatile superconducting platform for engineering quantum orders and provide fresh insights into the underlying pairing mechanisms.
ER -