Electronic Nematic Order and Anisotropic Transport in Bernal Bilayer Graphene

Electronic nematicity describes the Coulomb-driven process that spontaneously breaks the rotational symmetry in an electronic state. A key open question remains: how does this broken symmetry influence electronic transport in the ohmic regime? In this talk, I will present the identification and characterization of electronic nematic order in Bernal bilayer graphene, achieved through angle-resolved transport measurements in the ohmic regime, where the voltage response is linearly dependent on a small D.C. current. At zero magnetic field, we characterize transport anisotropy across the low-temperature phase space defined by carrier density and perpendicular electric field. We show that isotropic and anisotropic transport are directly connected to regimes of the phase space exhibiting distinct isospin orders. Notably, the proximity effect from a transition metal dichalcogenide crystal such as tungsten diselenide, not only modifies isospin order but also enhances transport anisotropy. By correlating angle-resolved transport measurements with fermiology results, we provide key experimental insights into electronic orders arising in a 2D electron system under strong correlation.