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We have measured the ultrafast anisotropic optical response of highly dopedgraphene to an intense single cycle terahertz pulse. The time profile of theterahertz-induced anisotropy signal at 800 nm has minima and maxima repeatingthose of the pump terahertz electric field modulus. It grows with increasingcarrier density and demonstrates a specific nonlinear dependence on theelectric field strength. To describe the signal, we have developed atheoretical model that is based on the energy and momentum balance equationsand takes into account optical phonons of graphene and substrate. According tothe theory, the anisotropic response is caused by the displacement of theelectronic momentum distribution from zero momentum induced by the pumpelectric field in combination with polarization dependence of the matrixelements of interband optical transitions.

Anisotropic ultrafast optical response of terahertz pumped graphene