Highly anisotropic transient optical response of charge density wave order in ZrTe3
Abstract
Low dimensionality in CDW systems leads to anisotropic optical properties, in both equilibrium and non-equilibrium conditions. Here we perform polarized two-color pump probe measurements on a quasi-1D material ZrTe3, in order to study the anisotropic transient optical response in the CDW state. Profound in-plane anisotropy is observed with respect to polarization of probe photons. Below TCDW both the quasi-particle relaxation signal and amplitude mode (AM) oscillation signal are much larger with Epr nearly parallel to a axis (Epr a) than for Epr parallel to b axis (Epr b). This reveals that Epr a signal is much more sensitive to the variation of the CDW gap. Interestingly, the lifetime of the AM oscillations observed with Epr b is longer than Epr a. Moreover, at high pump fluence where the electronic order melts and the AM oscillations vanish for Epr a , the AM oscillatory response still persists for Epr b. We discuss possible origins that lead to such unusual discrepancy between the two polarizations.
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