Electronic Structure and Superconductivity in La1.55Sr0.45CuO4/La2CuO4 Artificial High-Tc Superlattices Probed by Hard and Soft X-ray Spectroscopy
Abstract
In La1.55Sr0.45CuO4/La2CuO4 (LSCO/LCO) artificial high-Tc superlattices (AHTS), grown by quantum material design, the superconducting dome can be tuned by varying the geometric ratio L/d, where L is the LCO layer thickness and d is the superlattice nanoscale period. Here, we combine hard X-ray photoelectron spectroscopy (HAXPES) and polarization-dependent soft X-ray absorption spectroscopy (XAS) to probe how the electronic structure evolves across the L/d-tuned superconducting dome. We observe systematic chemical-potential evolution across the series, together with enhanced spectral weight near the Fermi level, enhanced local and non-local screening signatures, and increased in-plane orbital polarization near the top of the dome. Together, these spectroscopic signatures provide insight into the emergence of Fano-Feshbach resonant superconductivity in the LSCO/LCO AHTS series.
Related
- Quantitative Impact of Occupation Smearing Methods on Conventional Superconductivity: from Electronic Structure through Lattice Dynamics to Electron-Phonon Coupling
- Probing the electronic structure of UTe2 with ARPES and high-energy spectroscopy
- Nuclear moments, charge radii, and magnetization distribution parameters of Ag isotopes from laser spectroscopy and \textit{ab initio} electronic-structure calculations
- Electronic Structure of Cobalamins Defined by High Energy Resolution Fluorescence Detected X-ray Absorption Spectroscopy: Insights into Photochemical Axial Bond Cleavage in the CarH Photoreceptor
- Ultrafast Dissipative Localization of Electronic Energy in AuPt Superlattices
BibTeX
@misc{jayathilake2026electronic,
title = {{Electronic Structure and Superconductivity in La$_1.55$Sr$_0.45$CuO$_4$/La$_2$CuO$_4$ Artificial High-$T_c$ Superlattices Probed by Hard and Soft X-ray Spectroscopy}},
author = {U. M. Jayathilake and S. Sheikh and T. -L. Lee and C. Klewe and G. Logvenov and G. Campi and A. Bianconi and A. X. Gray},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02668},
eprint = {2609.02668},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02668},
}
RIS
TY - UNPB
TI - Electronic Structure and Superconductivity in La_1.55Sr_0.45CuO_4/La_2CuO_4 Artificial High-T_c Superlattices Probed by Hard and Soft X-ray Spectroscopy
AU - U. M. Jayathilake
AU - S. Sheikh
AU - T. -L. Lee
AU - C. Klewe
AU - G. Logvenov
AU - G. Campi
AU - A. Bianconi
AU - A. X. Gray
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02668
UR - https://arxiv.org/abs/2609.02668
AB - In La_1.55Sr_0.45CuO_4/La_2CuO_4 (LSCO/LCO) artificial high-T_c superlattices (AHTS), grown by quantum material design, the superconducting dome can be tuned by varying the geometric ratio L/d, where L is the LCO layer thickness and d is the superlattice nanoscale period. Here, we combine hard X-ray photoelectron spectroscopy (HAXPES) and polarization-dependent soft X-ray absorption spectroscopy (XAS) to probe how the electronic structure evolves across the L/d-tuned superconducting dome. We observe systematic chemical-potential evolution across the series, together with enhanced spectral weight near the Fermi level, enhanced local and non-local screening signatures, and increased in-plane orbital polarization near the top of the dome. Together, these spectroscopic signatures provide insight into the emergence of Fano-Feshbach resonant superconductivity in the LSCO/LCO AHTS series.
ER -