Excitation by light pulses enables the manipulation of phases of quantum condensed matter. Here, we photoexcite high-energy holon-doublon pairs as a way to alter the magnetic free energy landscape of the Kitaev-Heisenberg magnet α-RuCl3,[1,2] with the aim to dynamically stabilize a proximate spin liquid phase. The holon-doublon pair recombination through multimagnon emission [3] is tracked through the time-evolution of the magnetic linear dichroism originating from the competing zigzag spin ordered ground state. A small holon-doublon density suffices to reach a spin disordered state. The phase transition is described within a dynamic Ginzburg-Landau framework, corroborating the quasistationary nature of the transient spin disordered phase. Our work provides insight into the coupling between the electronic and magnetic degrees of freedom in α-RuCl3 and suggests a new route to reach a proximate spin liquid phase in Kitaev-Heisenberg magnets.[4]References: [1] A. Banerjee et al., Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet, Nat. Mater. 15, 733-740 (2016). [2] H. Takagi et al.,Concept and realization of Kitaev quantum spin liquids, Nat. Rev. Phys. 1, 264-280 (2019). [3] Z. Lenarcic et al., Ultrafast charge recombination in a photoexcited Mott-Hubbard insulator, Phys. Rev. Lett. 111, 016401 (2013). [4] R.B. Versteeg et al. Nonequilibrium quasistationary spin disordered state in the Kitaev-Heisenberg magnet α-RuCl3, arXiv:2005.14189 [cond-mat.str-el] (2020) 


Nonequilibrium quasistationary spin disordered state in the Kitaev-Heisenberg magnet α-RuCl3

A2: Frustrated Magnetic Systems

technical paper

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Rolf Versteeg

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Nonequilibrium quasistationary spin disordered state in the Kitaev-Heisenberg magnet α-RuCl3

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