Nano-infrared imaging of metal insulator transition in few-layer 1T-TaS2
Autor: | Zhang Songtian S., Rajendran Anjaly, Chae Sang Hoon, Zhang Shuai, Pan Tsai-Chun, Hone James C., Dean Cory R., Basov D. N. |
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Jazyk: | angličtina |
Rok vydání: | 2023 |
Předmět: | |
Zdroj: | Nanophotonics, Vol 12, Iss 14, Pp 2841-2847 (2023) |
Druh dokumentu: | article |
ISSN: | 2192-8606 2192-8614 |
DOI: | 10.1515/nanoph-2022-0750 |
Popis: | Among the family of transition metal dichalcogenides, 1T-TaS2 stands out for several peculiar physical properties including a rich charge density wave phase diagram, quantum spin liquid candidacy and low temperature Mott insulator phase. As 1T-TaS2 is thinned down to the few-layer limit, interesting physics emerges in this quasi 2D material. Here, using scanning near-field optical microscopy, we perform a spatial- and temperature-dependent study on the phase transitions of a few-layer thick microcrystal of 1T-TaS2. We investigate encapsulated air-sensitive 1T-TaS2 prepared under inert conditions down to cryogenic temperatures. We find an abrupt metal-to-insulator transition in this few-layer limit. Our results provide new insight in contrast to previous transport studies on thin 1T-TaS2 where the resistivity jump became undetectable, and to spatially resolved studies on non-encapsulated samples which found a gradual, spatially inhomogeneous transition. A statistical analysis suggests bimodal high and low temperature phases, and that the characteristic phase transition hysteresis is preserved down to a few-layer limit. |
Databáze: | Directory of Open Access Journals |
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