9 papers
Theory of ab initio downfolding with arbitrary range electron-phonon coupling
Norm M. Tubman, Christopher J. N. Coveney, Chih-En Hsu +6
Ab initio downfolding describes the electronic structure of materials within a low-energy subspace, often around the Fermi level. Typically starting from mean-field calculations, t…
Layer-tunable Hubbard bands probed via moiré excitons in MoSe/WS heterostructures
Hongyu Yao, Qiao Li, Chih-En Hsu +5
Moiré superlattices in transition metal dichalcogenide heterostructures provide a highly tunable platform for engineering strongly interacting states at the nanoscale. However, qu…
Many-Body Correlation Effects in Fröhlich Electron-Phonon Coupling
Zien Zhu, Chih-En Hsu, Benran Zhang +5
In compound semiconductors and insulators, the polar electron-phonon coupling diverges at long range, known as the Fröhlich interaction. Modern first-principles electron-phonon ca…
Moiré excitons in generalized Wigner crystals
Jing-Yang You, Chih-En Hsu, Zien Zhu +8
Moiré superlattices of transition-metal dichalcogenide bilayers host strong Coulomb interactions residing in narrow electron bands, leading to correlated insulating states at frac…
IsoME: Streamlining High-Precision Eliashberg Calculations
Eva Kogler, Dominik Spath, Roman Lucrezi +5
This paper introduces the Julia package IsoME, an easy-to-use yet accurate and robust computational tool designed to calculate superconducting properties. Multiple levels of approx…
Phonon-mediated electron attraction in SrTiO via the generalized Fröhlich and deformation potential mechanisms
Christopher J. N. Coveney, Norm M. Tubman, Chih-En Hsu +6
Superconductivity in doped SrTiO was discovered in 1964, the first superconducting transition observed in a doped semiconductor. However, the mechanism of electron pairing in S…