Internship and thesis proposals
Unconventional Superconductivity in Twisted Bilayer Graphene

Domaines
Condensed matter
Low dimension physics
Topological materials, Quantum Transport, Cavity Quantum Electrodynamics
Nanophysics, nanophotonics, 2D materials and van der Waals heterostructures,, surface physicss, new electronic states of matter

Type of internship
Théorique, numérique
Description
Twisted magic-angle graphene hosts a wealth of remarkable behaviors, including exotic band topology, strong correlation effects, and unconventional superconductivity. Recent experiments on TBG have revealed an unusual superconducting phase that is enhanced by an external magnetic field. This is unusual since a magnetic field typically suppresses superconductivity by breaking the time-reversal symmetry that protects Cooper pairs. Interestingly, similar magnetic-field-induced enhancement of conductivity occur in Chern insulators, which exhibit the anomalous quantum Hall effect. Twisted heterostructures have emerged as promising candidates for realizing Chern insulating states, and quantized anomalous Hall effects have been observed in bilayer and trilayer graphene aligned with hBN. Together, these discoveries point to a deep connection between band topology and superconductivity in TBG. The central questions we address are: can the interplay between band topology and magnetic field account for the unconventional superconductivity observed in twisted bilayer graphene, and what are the defining properties of this state? We explore these questions using a combination of analytical and numerical approaches.

Contact
Dganit MEIDAN
Laboratory : Structures, Propriétés et Modélisation des Solides - 8580
Team : SPMS
Team Website
/ Thesis :    Funding :