Theoretical Modeling of the Non-equilibrium Amorphous State in 1T-TaS2

Abstract

1T-TaS2 is known for it’s remarkably complex phase diagram and it’s unique long-lived metastable hidden (H) state. Recently, a novel metastable state has been discovered using higher fluences for photoexcitation than in the case of the H state. The state has been dubbed as amorphous (A) due to it’s similarity to glass. Expanding on the work of Brazovskii and Karpov, we show that the A state can be successfully modeled with classical interacting polarons on a two dimensional hexagonal lattice. We have found that the polaron configuration of the A state corresponds to a frustrated screened Coulomb system, where there is no order-disorder phase transition.

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Acknowledgements

We wish to thank Tomaz Mertelj for the useful discussions. The work was supported by ERC-2012-ADG20120216 “Trajectory” and the Slovenian Research Agency (program P1-0040 and young researcher P0-8333).

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Correspondence to Jaka Vodeb.

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Vodeb, J., Kabanov, V.V., Gerasimenko, Y.A. et al. Theoretical Modeling of the Non-equilibrium Amorphous State in 1T-TaS2. J Supercond Nov Magn 32, 3057–3063 (2019). https://doi.org/10.1007/s10948-019-5028-1

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Keywords

  • Charge density waves
  • Polarons
  • Lattice gas model
  • Monte Carlo simulations