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Updated: Sep 27, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit.
Chaofei Liu1, Andreas Kreisel2, Shan Zhong1
1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Orbital selectivity drives Cooper pairing in one-unit-cell FeSe superconductors. This finding clarifies the pairing mechanism in high-temperature superconductors, highlighting the role of electron correlations.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Multiband superconductors exhibit orbital differentiation, influencing normal-state properties.
- Orbital-selective phenomena are key to understanding Cooper pairing, especially in high-temperature superconductors.
- The pairing mechanism in one-unit-cell (1-UC) FeSe/SrTiO3 remains debated due to inapplicable standard theories.
Purpose of the Study:
- To investigate the pairing mechanism in 1-UC FeSe/SrTiO3.
- To explore the role of orbital selectivity in Cooper pairing.
- To elucidate the influence of electronic correlations on superconductivity.
Main Methods:
- High-resolution Bogoliubov quasiparticle interference measurements.
- Theoretical calculations incorporating orbitally selective electronic correlations.
- Spin-fluctuation pairing calculations.
Main Results:
- Observation of highly anisotropic magnetic Cooper pairing in 1-UC FeSe.
- Theoretical model shows d orbital coherence suppression due to electronic correlations.
- The calculated pairing gap aligns with experimental observations.
Conclusions:
- Orbital selectivity is crucial for high-temperature Cooper pairing in 2D-limit 1-UC FeSe.
- Findings suggest orbital selectivity is prevalent in iron-based superconductors.
- Electron correlations play a universal role in high-temperature superconductivity.
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