Journal Article

PUBDB-2026-01120

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png 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)Extern*

2026
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/8w95-byyy  doi:10.3204/PUBDB-2026-01120

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.

Note: The financial support from UGC (Certificate No.JUN21C07016), and IACS are greatly acknowledged. P.M. thanks all the CSS operators of IACS. S.D. acknowl-edges the financial support from DST-ANRF grant No.CRG/2021/004334. S.D. also acknowledges support from theTechnical Research Centre (TRC), IACS, KolkataConceptualization and resources were provided by S.D.Crystal growth was performed by K.R. Transport (dc andpulse) measurements and data curation were carried out atIACS by P.M., supported by K.D., B.D. Electron localizationcalculation was done by P.M. and T.K. The second harmonicresponse was measured at IACS by P.M., supported by B.D.Device fabrication was conducted at IACS by M.P., P.M., S.M.with technical support provided by P.K.H., B.K. Resistivenetwork analysis was performed by B.M. in consultation withS.D. and P.M. The computational approach was led by S.G.,supported by M.A.M. XPS measurements were performedby S.K.M. and S.C., supported by K.R. The power dissi-pation model was proposed by S.S. The free-energy modeland related calculations were developed by S.D. and P.M.P.M is thankful to Soham Das for useful discussion. Themanuscript was written by P.M. and S.D., with input from allauthors.

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Contributing Institute(s):

1. FS-SXQM (FS-SXQM)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint 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)
Percolative instabilities and sparse-limit fractality in 1T−TaS$_2$
[10.3204/PUBDB-2026-01239]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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