Bilayer graphene's flat bands host momentum-polarized nematic phases stabilized by exchange interactions, where the carriers spontaneously populate one of several Fermi pockets induced by trigonal warping. Carriers sample k-dependent band mass in the polarized momentum-distribution, making transport coefficients sensitive to pocket polarization, and resulting in the ohmic resistivity decreasing with temperature. Under strong electric field, the momentum-polarized states feature switching between different pockets. This behavior, along with negative d00exR/d00exT, may serve as a diagnostic of pocket-polarized order.
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Panigrahi et al. (2024) studied this question.
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