中国科学院物理所赵继民团队发现了1T-TaS2中超快集体动力学揭示的新兴量子态。相关论文于2025年2月25日发表在《美国科学院院刊》杂志上。
电荷密度波（CDW）材料1T-TaS2被提出作为量子自旋液体候选者，其在转变温度以下形成团簇Mott绝缘体。研究组报道了一种实验性的超快产生和检测其CDW态的相干振幅模式（AM）。
结果出现了一个显著特征：除了在65至200 K范围内观察到的T2温度依赖性外，相干CDW模式AM在65 K以下还表现出不寻常的T3.56温度依赖性。这种行为表明，在65 K以下，能隙内电子激发增强，并出现了新的物质相。因此，有趣的量子态导致了交叉。该研究为理解量子材料中不同自由度之间的相互作用提供了见解。
附：英文原文
Title: Emergent quantum state unveiled by ultrafast collective dynamics in 1T-TaS2
Author: Hasaien, Jiazila, Wu, Yanling, Shi, Mengzhu, Zhai, Yanni, Wu, Qiong, Liu, Zheng, Zhou, Yi, Chen, Xianhui, Zhao, Jimin
Issue&Volume: 2025-2-25
Abstract: Charge density wave (CDW) material 1T-TaS2 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 T3.56 temperature dependence below 65 K, in addition to the T2 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.
DOI: 10.1073/pnas.2406464122
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2406464122