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    Percolative instabilities and sparse-limit fractality in 1T−TaS2

    Poulomi Maji1, Md Aquib Molla2, Koushik Dey1, Bikash Das1, Sambit Choudhury3, Tanima Kundu1, Pabitra Kumar Hazra1, Mainak Palit1, Sujan Maity1 et al.

    Bipul Karmakar1, Kai Rossnagel4,5, Sanjoy Kr Mahatha3, Bhaskaran Muralidharan6, Shamashis Sengupta7, Sanchari Goswami2, and Subhadeep Datta1,*

    • *Contact author: sspsdd@iacs.res.in

    Phys. Rev. B 113, 115110 – Published 5 March, 2026

    DOI: https://doi.org/10.1103/8w95-byyy

    Abstract

    The low-temperature metallic phase of 1T−TaS2 may originate from the current- and voltage-driven destabilization of the commensurate charge density wave in a strongly correlated Mott-insulator, alongside the robust yet rarely realized influence of intrinsic electronic distortions. Electrical pulse-driven transport, combined with the second harmonic response, reveals abrupt switching, negative differential resistance, and multiscale domain-wall reorganization. The free-energy analysis identifies a critical order parameter threshold for the Mott-metal transition, with scaling exponents (β≈1.3) consistent with two-dimensional percolation. The sparse limit fractal dimension Df≈0.3 at 10 K, rising to ≈0.9 at 300 K, reflects the hierarchical evolution of the conductive pathways throughout the temperature. These findings establish a direct connection between fractal percolation, pulse-induced instabilities, and correlated electron transport, offering a framework for controlled access to nonequilibrium phase transitions in low-dimensional quantum materials.

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