Light-Tunable 1T-TaS2 Charge-Density-Wave Oscillators,ACS Nano

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Light-Tunable 1T-TaS2 Charge-Density-Wave Oscillators
ACS Nano ( IF 15.8 ) Pub Date : 2018-10-09 00:00:00 , DOI: 10.1021/acsnano.8b05756
Chao Zhu ₁ , Yu Chen ₂ , Fucai Liu _{1,

3} , Shoujun Zheng _{2,

4} , Xiaobao Li ₅ , Apoorva Chaturvedi ₁ , Jiadong Zhou ₁ , Qundong Fu ₁ , Yongmin He ₁ , Qingsheng Zeng ₁ , Hong Jin Fan _{2,

4} , Hua Zhang ₁ , Wen-Jun Liu ₆ , Ting Yu ₂ , Zheng Liu _{1,

7,

8}

Affiliation

External stimuli-controlled phase transitions are essential for fundamental physics and design of functional devices. Charge density wave (CDW) is a metastable collective electronic phase featured by the periodic lattice distortion. Much attention has been attracted to study the external control of CDW phases. Although much work has been done in the electric-field-induced CDW transition, the study of the role of Joule heating in the phase transition is insufficient. Here, using the Raman spectroscopy, the electric-field-driven phase transition is in situ observed in the ultrathin 1T-TaS₂. By quantitative evaluation of the Joule heating effect in the electric-field-induced CDW transition, it is shown that Joule heating plays a secondary role in the nearly commensurate (NC) to incommensurate (IC) CDW transition, while it dominants the IC-NC CDW transition, providing a better understanding of the electric field-induced phase transition. More importantly, at room temperature, light illumination can modulate the CDW phase and thus tune the frequency of the ultrathin 1T-TaS₂ oscillators. This light tunability of the CDW phase transition is promising for multifunctional device applications.

中文翻译：

光可调1T-TaS ₂电荷密度波振荡器

外部刺激控制的相变对于基本物理学和功能器件的设计至关重要。电荷密度波（CDW）是亚稳的集体电子相，具有周期性晶格畸变的特征。研究CDW相的外部控制已经引起了很多关注。尽管在电场诱导的CDW跃迁中已经做了很多工作，但是对于焦耳热在相变中的作用的研究还不够。在这里，使用拉曼光谱，在超薄的1T-TaS ₂中原位观察到电场驱动的相变。通过对电场诱导的CDW跃迁中的焦耳热效应的定量评估，表明焦耳热在CDW跃迁中几乎从相称（NC）到不相称（IC）的转变中起次要作用。 CDW过渡，可以更好地理解电场引起的相变。更重要的是，在室温下，光照可以调节CDW相位，从而调节超薄1T-TaS ₂振荡器的频率。CDW相变的这种光可调性对于多功能设备应用是有希望的。

更新日期：2018-10-09

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