Emergent quantum state unveiled by ultrafast collective dynamics in 1<i>T</i>-TaS<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39999177.
- Also identified by DOI 10.1073/pnas.2406464122 and PMC identifier 11892630.
- Licence recorded as CC BY-NC-ND.
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Abstract
Charge density wave (CDW) material 1<i>T</i>-TaS<sub>2</sub> was proposed as a quantum spin liquid candidate, on which a cluster Mott insulator comes into being below the transition temperature. We report an experimental ultrafast generation and detection of the coherent amplitude mode (AM) of its CDW state. A salient feature emerges: The coherent CDW mode AM exhibits an unusual <i>T</i><sup>3.56</sup> temperature dependence below 65 K, in addition to the <i>T</i><sup>2</sup> temperature dependence observed in the 65 to 200 K range. This behavior suggests the enhancement of in-gap electronic excitations below 65 K and the emergence of a new phase of matter. Consequently, the intriguing quantum state leads to a crossover. Our investigation provides insights into understanding the interplay among various degrees of freedom in quantum materials.