Photoinduced nematic state in FeSe${}_{0.4}$Te${}_{0.6}$

Abstract

FeSe${}_x$Te${}_{1-x}$ compounds present a complex phase diagram, ranging from the nematicity of FeSe to the $(\pi ,\pi )$ magnetism of FeTe. We focus on FeSe${}_{0.4}$Te${}_{0.6}$, where the nematic ordering is absent at equilibrium. We use a time-resolved approach based on femtosecond light pulses to study the dynamics following photoexcitation in this system. The use of polarization-dependent time- and angle-resolved photoelectron spectroscopy allows us to reveal a photoinduced nematic metastable state, whose stabilization cannot be interpreted in terms of an effective photodoping. We argue that the 1.55 eV photon-energy-pump-pulse perturbs the $C_4$ symmetry of the system triggering the realization of the nematic state. The possibility to induce nematicity using an ultra-short pulse sheds a new light on the driving force behind the nematic symmetry breaking in iron-based superconductors. Our results weaken the idea that a low-energy coupling with fluctuations is a necessary condition to stabilize the nematic order and ascribe the origin of the nematic order in iron-based superconductors to a clear tendency of those systems towards orbital differentiation due to strong electronic correlations induced by the Hund's coupling.

arXiv comment7 pages, 3 figures

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• Time- and Angle-Resolved Photoemission Studies of Quantum Materials