Field theory of a superconductor with repulsion

A Dalal, J Ruhman, V Kozii - Physical Review B, 2023 - APS
A superconductor emerges as a condensate of electron pairs, which bind despite their
strong Coulomb repulsion. Eliashberg's theory elucidates the mechanisms enabling them to …

Superconductivity of non-Fermi liquids described by Sachdev-Ye-Kitaev models

C Li, S Sachdev, DG Joshi - Physical Review Research, 2023 - APS
We investigate models of electrons in the Sachdev-Ye-Kitaev class with random and all-to-
all electron hopping, electron spin exchange, and Cooper-pair hopping. An attractive on-site …

Monte Carlo solver and renormalization of Migdal-Eliashberg spin chain

YZ Chou, Z Wang, S Das Sarma - Physical Review B, 2024 - APS
Motivated by the recently developed classical spin model for the Migdal-Eliashberg theory,
we develop numerical and analytical methods based on this spin-chain representation and …

Pairing and pair breaking by gauge fluctuations in bilayer composite fermion metals

H Deng, L Mendoza, NE Bonesteel - Physical Review B, 2024 - APS
We study interlayer pairing of composite fermions in the total ν= 1/2+ 1/2 quantum Hall
bilayer as a possible framework for understanding the experimentally observed transition …

Electron Interactions in Rashba Materials

Y Gindikin, A Kamenev - arXiv preprint arXiv:2310.20084, 2023 - arxiv.org
We show that Rashba spin-orbit coupling modifies electron-electron interaction vertex
leading to a number of novel phenomena. First, the spin-orbit-modified Coulomb interactions …

Quantum Criticality and Superconductivity in Systems Without Quasiparticles

C Li - 2024 - dash.harvard.edu
The discovery of high-temperature superconductors has raises questions that extend
beyond the scope of quasiparticles, a foundational concept in condensed matter theory. This …