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Transport and spectroscopic signatures of a disorder-stabilized metal in two-dimensional frustrated Mott insulators

We report the first non perturbative study of disorder induced insulator-metal transition at half filling in a geometrically frustrated triangular lattice Mott insulator. Our numerical approach allows one to treat the effects of thermal and disorder induced spatial fluctuations, geometric frustration of lattice and competing symmetry breaking orders, on equal footing; a goal most of the existing techniques fail to achieve. The results presented herein demonstrate that disorder stabilizes a “magnetic” metal cradled between a Mott insulator and an Anderson insulator at low temperatures. Based on magnetic, spectroscopic and transport signatures, we establish the emergent metal to be a non Fermi liquid, arising out of the competition between the two electron localizing tendencies viz. Mott repulsion and Anderson localization. Further, our finite temperature results show a re-entrant thermal transition arising out of the fluctuating magnetic moments. Our work is the first microscopic description of the experimentally observed disorder induced metal in two-dimensional transition metal dichalcogenide Mott insulator 1T-TaS2, and the results are in excellent agreement with the existing experimental observations. Our predictions on finite temperature spectroscopic and transport characteristics are expected to serve as suitable benchmarks for future experiments on 1T-TaS2, and related class of materials.