电场驱动下亚稳态MoS $_2$薄片的结构和电子相变
Structural and electronic phase transitions driven by electric field in metastable MoS$_2$ thin flake
摘要：
过渡金属二硫属化合物具有多种结构和电子性质，可以通过结构变化、元素取代、离子或分子插入等进行调节。然而，对该家族的亚稳相的了解非常有限，特别是对结构变化的精确调节和伴随的电子性质的演变。在此，基于一种新开发的以固体离子导体为栅介质的场效应晶体管，我们报道了在电场驱动下，亚稳态MoS $_2$薄片的可控结构和电子相变。我们发现，在电场的调控下，1 T $^{'''}$ -MoS $_2$薄片的亚稳结构可以转变为1 T $^{'}$ -型的另一种亚稳结构。此外，亚稳的1 T $^{'}$相在由电场控制的锂的嵌入和脱嵌的循环期间持续存在，并且电子性质可以可逆地操纵，从绝缘的1 T $^{'}$ -LiMoS $_2$到超导的1 T $^{'}$ -MoS $_2$的电阻显著地改变四个数量级。这种可逆的和戏剧性的电子性质的变化提供了有趣的机会，开发新的纳米器件具有高度可调特性下的电场。
英文摘要：
Transition-metal-dichalcogenides own a variety of structures as well as electronic properties which can be modulated by structural variations, element substitutions, ion or molecule intercalations, etc. However, there is very limited knowledge on metastable phases of this family, especially the precise regulation of structural changes and accompanied evolution of electronic properties. Here, based on a new developed field-effect transistor with solid ion conductor as the gate dielectric, we report a controllable structural and electronic phase transitions in metastable MoS$_2$ thin flakes driven by electric field. We found that the metastable structure of 1T$^{'''}$-MoS$_2$ thin flake can be transformed into another metastable structure of 1T$^{'}$ -type upon intercalation of lithium regulated by electric field. Moreover, the metastable 1T$^{'}$ phase persists during the cycle of intercalation and de-intercalation of lithium controlled by electric field, and the electronic properties can be reversibly manipulated with a remarkable change of resistance by four orders of magnitude from the insulating 1T$^{'}$-LiMoS$_2$ to superconducting 1T$^{'}$-MoS$_2$. Such reversible and dramatic changes in electronic properties provide intriguing opportunities for development of novel nano-devices with highly tunable characteristics under electric field.
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