Giant elastoresistance in magic-angle twisted bilayer graphene.

Near the magic angle (≈1.1°) in twisted bilayer graphene, uniaxial strain produces elastoresistance with a gauge factor more than two orders of magnitude larger than conventional metals.

• Why it matters: Correlated and topological moiré phases are highly sensitive to lattice geometry, but a direct, tunable probe of how strain reshapes their electronic response is needed.
• What they did: Electrical transport was measured in twisted bilayer graphene under continuous uniaxial strain, mapping elastoresistance versus band filling and temperature near ≈1.1°.
• The result: In selected doping regimes, elastoresistance shows a Curie-Weiss-like temperature divergence, enabling strain-based probing of correlated physics and suggesting nematic fluctuations or enhanced electronic entropy from fluctuating isospin moments.

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