Monday, 19 March 2018
School of Physics
University of Melbourne
"Unconventional superconductivity in 2D systems from repulsive electron-electron interactions"
Superconductivity usually arises from a phonon-mediated attractive interaction between the conducting electrons leading to the formation of Cooper pairs. There are, however, several superconducting materials that behave differently, in particular, the copper oxide, iron-based and topological superconductors. The unconventional superconductivity in these materials arises primarily from repulsive electron-electron interactions.
We use a weak-coupling renormalization group method to calculate the superconducting groundstates of two-dimensional metals, applicable to any lattice and for arbitrary parameters. Here, we focus primarily on the paradigmatic square and hexagonal lattices. Among the different superconducting groundstates, we often find superconductivity with chiral singlet or chiral triplet pairing symmetry. Finally, we discuss material realisations to demonstrate the method's potential.
WHEN: Monday 19 March 2018
WHERE: Room 314, Science 3 Building
TIME: 3.00 pm–4.00 pm
All interested are welcome to attend
Light refreshments to follow in Common Room