Electron anisotropy and its origin in twisted trilayer graphene

Using a new scheme of angle-resolved transport measurement, I will report the identification and characterization of electronic anisotropy in twisted trilayer graphene. Our measurement scheme not only extracts the conductivity matrix for the underlying electronic state, but it also offers direct characterization for the spatial homogeneity of the twisted trilayer graphene sample. By mapping out the evolution with the band-filling, temperature, and twist angle, the angle-resolved measurement provides a novel window into the role of Coulomb interaction and lattice distortion. Together, our findings point towards an underlying connection between electron anisotropy, cascade of isospin polarization transitions and the electronic order that breaks both parity and time-reversal symmetry. The influence of lattice distortion, while unavoidable in solid state samples, is of secondary importance.