This paper investigates correlated electron phenomena in magic angle twisted bilayer graphene (TBG) using optical conductivity calculations. The authors show how optical conductivity measurements can distinguish different symmetry-breaking states and reveal the nature of correlated states, particularly nematic order. Their findings indicate that nematic order can induce a finite Drude weight at the charge neutrality point (CNP), with the sign of the Drude weight anisotropy depending on lattice relaxation, doping, and the type of symmetry breaking.

María J. Calderón, Elena Bascones