AI 中文总结
该研究针对1T-TaS₂的金属-绝缘体相变，通过多组测量发现冷却与加热过程动力学非对称，建立了非热程度控制一级相变路径选择的通用框架。
AI 中文摘要
我们报道了1T-TaS₂中热驱动金属-绝缘体相变（MIT）的非对称动力学。结合输运、量热和拉曼测量表明，冷却过程中相变以爆发式雪崩进行，而加热过程中保持连续。尽管体相输运被渗流传导掩盖，局部探针和热测量揭示了转变路径的内在非对称性。利用脉冲焦耳加热产生的受控非平衡热扰动，我们证明冷却过程中相序动力学仍为强非热型，而加热过程中涨落逐渐克服形核势垒，导致转变平滑进行。对热扰动的不同响应表明，两个滞后分支具有不同程度的非热性，这决定了转变路径并产生观测到的动力学非对称性。这些结果建立了一个通用框架，其中非热程度控制一级相变中的路径选择。
英文摘要
We report asymmetric kinetics in thermally driven metal-insulator transitions (MITs) in 1T-TaS$_2$. Using combined transport, calorimetric, and Raman measurements, we show that the transition proceeds via burst-like avalanches during cooling, while remaining continuous during heating. Although bulk transport is masked by percolative conduction, local probes and thermal measurements reveal intrinsic asymmetry in the transformation pathways. Using controlled nonequilibrium thermal perturbations generated by pulsed Joule heating, we demonstrate that the phase-ordering dynamics remains strongly athermal during cooling, whereas during heating fluctuations progressively overcome nucleation barriers, leading to a smooth transformation. The distinct responses to thermal perturbations indicate different degrees of athermality of the two hysteresis branches, which govern the transformation pathways and give rise to the observed kinetic asymmetry. These results establish a general framework in which the degree of athermality controls pathway selection in first-order phase transitions.
Comments14 pages, 10 figures
