"CORRALATED PHASES AND CHIRALITY IN MULTILAYER GRAPHENE"

By Tobias Stauber (Materials Sciences Institute of Madrid (ICMM), Madrid, Spain)

ABSTRACT:

Much progress has been achieved in the controlled stacking of two-dimensional crystals which gives rise to a plethora of new correlated phases due to flat-band engineering. In the first part of the lecture, I will discuss our theoretical results on some electronic phases in multilayer graphene. Concretely, I will argue that a universal pairing mechanism in these multilayer systems related to Ising superconductivity seems likely. In the second part of the lecture, I will present an effective (minimal) theory for chiral van-der-Waals materials. I will then discuss the response of undoped and doped twisted bilayers, unveiling unusual phenomena in the zero and finite frequency limit.

BIOGRAPHY:

Tobias Stauber obtained his Diploma in Physics from the University of Göttingen, Germany in 1998 and his PhD in Theoretical Physics from the University of Heidelberg, Germany in 2002. He was Assistant Research Professor at the University of Minho and at the University Autónoma of Madrid. Since 2014, he is Tenured Scientist at the Material Science Institute of Madrid of the Spanish National Research Council. In 2020, he was Salvador de Madariaga Fellow at the University of Regensburg, Germany and in 2021/22 Professor at the University of Augsburg, Germany. His research interests include unconventional superconductors, magnetic and topological order, nanophotonics with strong light-matter interaction and plasmonics.

REFERENCE(S):

1. J. González and T. Stauber. Kohn-Luttinger superconductivity in twisted bilayer graphene. Phys. Rev. Lett. 122, 026801 (2019) (see also arXiv:2110.11294)
2. T. Stauber, T. Low, and G. Gómez-Santos. Chiral response in twisted bilayer graphene. Phys. Rev. Lett. 120, 046801 (2018)