Speaker: Rafael Luque Merino
Affiliation: 2D Foundry Research Group, ICMM
Date: Tuesday, 28 October 2025 at 12:00
Location: Seminar Room, Serrano 121 (CFMAC)
Quantum materials with moiré superlattices offer a tunable platform to explore strong correlations and emergent symmetries in two dimensions. Magic-angle twisted bilayer graphene (MATBG) is a prime example, where flat bands amplify interaction effects and enable rich transport phenomena. I will present two experiments: (i) optically driven thermoelectric transport revealing anomalous thermopower consistent with coexisting localized and delocalized states in MATBG’s flat bands, and (ii) frequency-resolved photomixing showing efficient hot-carrier cooling enabled by moiré-assisted Umklapp electron–phonon scattering. I will also outline upcoming directions using controllable uniaxial strain to tune symmetry and band geometry: imaging strain-induced symmetry breaking with advanced force microscopy and probing the resulting nonlinear Hall response with low-temperature transport to establish links between strain, structural properties, and electronic correlations