Percolative instabilities and sparse-limit fractality in 1T−TaS$_2$

Maji, Poulomi; Goswami, Sanchari; Rossnagel, Kai; Dey, Koushik; Palit, Mainak; Hazra, Pabitra Kumar; Mahatha, Sanjoy Kr; Karmakar, Bipul; Das, Bikash; Molla, Md Aquib; Muralidharan, Bhaskaran; Datta, Subhadeep; Choudhury, Sambit; Sengupta, Shamashis; Maity, Sujan; Kundu, Tanima

Preprint

PUBDB-2026-01239

Percolative instabilities and sparse-limit fractality in 1T−TaS$_2$

Maji, P. ; Molla, M. A. ; Dey, K. ; Das, B. ; Choudhury, S. ; Kundu, T. ; Hazra, P. K. ; Palit, M. ; Maity, S. ; Karmakar, B. ; Rossnagel, K.DESY* ; Mahatha, S. K. ; Muralidharan, B. ; Sengupta, S. ; Goswami, S. ; Datta, S. (Corresponding author)

2026

[10.3204/PUBDB-2026-01239]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2026-01239

Report No.: arXiv:2602.23930

Abstract: The low-temperature metallic phase of 1T-TaS$_2$ may originate from current- and voltage-driven destabilization of the commensurate charge density wave (CDW) in a strongly correlated Mott insulator, alongside the robust yet rarely realized influence of intrinsic electronic distortions. Electrical pulse-driven transport, combined with second harmonic response, reveals abrupt switching, negative differential resistance (NDR), and multiscale domain-wall reorganization. The free energy analysis identifies a critical order parameter threshold for the Mott-metal transition, with scaling exponents (β approx 1.3) consistent with 2D percolation. The sparse limit fractal dimension D_{f} approx 0.3 at 10 K, rising to approx 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 non-equilibrium phase transitions in low-dimensional quantum materials.

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