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Updated: Sep 18, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Published on: April 12, 2018

Interfacial Polarons Driven by Charge Transfer in WSe₂/Cuprate Superconductor Systems.

Huimin Liu¹, Tong Yang², Xiongfang Liu¹

¹Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, China.

|June 26, 2025

Summary

Researchers observed interfacial polarons and charge transfer in WSe₂/LSCO, impacting the electronic structure of 2D materials on cuprate superconductors. This finding offers insights into high-temperature superconductivity mechanisms.

Keywords:

charge transfer electronic structure first-principle calculations high-temperature superconductivity interfacial polarons spin−orbit interactions two-dimensional (2D) materials

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

Understanding electronic properties of doped copper-oxygen planes is key to high-temperature superconductivity.
Experimental data on charge transfer and polarons at cuprate superconductor interfaces are scarce.

Purpose of the Study:

Investigate electronic and optical properties of 2D materials on copper-based superconductors.
Determine the cause of unique band structures observed in WSe₂/LSCO systems.
Explore the role of interfacial polarons in cuprate superconductivity.

Main Methods:

High-resolution spectroscopic ellipsometry.
Density functional theory (DFT) calculations.
Study of 2D materials (monolayer-WSe₂) on copper-based superconductors (La_1.85Sr_0.15CuO₄).

Main Results:

Monolayer-WSe₂ on La_1.85Sr_0.15CuO₄ exhibits a unique band structure.
Formation of interfacial small polarons at the WSe₂/LSCO interface, driven by charge transfer.
Observed structural phase transition in LSCO reduces electron-hole interaction in WSe₂.

Conclusions:

Interfacial polarons significantly influence the electronic structure of WSe₂ films.
Charge transfer between the CuO₂ plane and WSe₂ drives polaron formation.
Findings provide a method to explore the relationship between interfacial polarons and superconductivity.