"Unveiling Quadratic Electron-Phonon Coupling in High-Temp Superconductors"
A new study in Physical Review Letters explores how quadratic electron-phonon coupling can enhance superconductivity by forming quantum bipolarons, potentially leading to higher critical temperatures. Researchers extended the Holstein model to incorporate this quadratic coupling, finding that it allows for more stable superconducting states at higher temperatures compared to linear coupling. Future work aims to identify materials with large quadratic couplings and optimize coupling strength for better superconductivity.