In a bilayer exciton condensate, the mean-field order parameter generates a hidden interlayer Berry curvature that produces a second-order out-of-plane polarization response to an in-plane AC field, scaling as the inverse square of the order parameter.
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Hidden Quantum Geometry in Bilayer Exciton Condensates
In a bilayer exciton condensate, the mean-field order parameter generates a hidden interlayer Berry curvature that produces a second-order out-of-plane polarization response to an in-plane AC field, scaling as the inverse square of the order parameter.