Materials with Berry-curvature dipoles support a non-Hermitian electro-optic effect that is investigated here for lasing at terahertz frequencies. Such a system is conceived here as a stack of low-symmetry 2D materials. We show that a cavity made of such a material supports a nonreciprocal growing mode with elliptical polarization that generates an unstable resonance leading to self-sustained oscillations. Notably, we demonstrate that the chiral nature of the gain derived from the Berry dipole allows the manipulation of the laser light’s handedness by a simple reversal of the electric field bias.

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• Electro-optic effects
• Hall effect
• Non-reciprocal propagation
• Optical conductivity
• Second order nonlinear optical processes
• Non-Hermitian systems
• Twisted bilayer graphene
• Terahertz sources