Dr. Giorgio Di Battista: Systematic study of the temperature-dependent resistivity in magic-angle twisted bilayer graphene

Abstract: Magic-angle twisted bilayer graphene (MATBG) is a two-dimensional system obtained by stacking two graphene sheets with a relative twist of approximately 1.1°, generating a moiré superlattice that profoundly reshapes the electronic band structure. The resulting flat bands enhance electronic interactions and give rise to a rich variety of correlated phases, including superconductivity, correlated insulators, and non-Fermi liquid metals. However, microscopic device details, such as substrate effects, twist-angle inhomogeneity, and local strain can influence the stability of these phases, leading to device-to-device variability in the reported phase diagrams. In this talk, I will present a systematic study of the temperature-dependent resistivity across multiple MATBG devices fabricated using the same protocol. By comparing several samples within a unified analysis framework, I identify robust and reproducible transport features to construct a sample-independent low-temperature phase diagram.

Bio: Dr. Giorgio Di Battista received his Bachelorʼs and Master of Science degrees in Physics from the University of Rome “La Sapienza” (Italy) before starting his Ph.D. in 2020 at ICFO, The Institute of Photonic Sciences (Spain). During his doctoral work, he developed the first single-photon detector based on the superconducting state of magic-angle twisted bilayer graphene, with a thesis titled: “Towards Infrared Single-Photon Detection with Superconducting Magic-Angle Twisted Bilayer Graphene.” Since 2025, he has been working as a Senior Scientist (Akademischer Rat) in the group of Prof. Dmitri K. Efetov at Ludwig Maximilians University of Munich (Germany). His current research focuses on transport and thermoelectric studies of strongly correlated phases in twisted bilayer graphene.