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arXiv 2005.13311cond-mat.str-elcond-mat.mtrl-sci
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1 TaS $_2$中可能的应变诱导Mott能隙崩塌

Possible strain induced Mott gap collapse in 1T-TaS$_2$

Kunliang Bu, Wenhao Zhang, Ying Fei, Zongxiu Wu, Yuan Zheng, Jingjing Gao, Xuan Luo, Yu-Ping Sun, Yi Yin

摘要:

调节物质的电子性质是科学研究和应用中的基本兴趣。最近,在原始层状过渡金属二硫属化物1 T-TaS $_2$中报道了莫特绝缘体-金属转变,其中转变由光激发、门控嵌入或电压脉冲触发。然而,突然的绝缘体-金属转变阻碍了对转变如何演变的探索。在这里,我们报告的应变作为一个可能的新的调谐参数,以诱导莫特间隙崩溃在1 T-TaS $_2$。在应变丰富的区域,我们发现一个镶嵌态,不同的域内具有不同的电子态密度。在波纹表面中,我们进一步观察和分析了从Mott能隙态到金属态的平滑演化。我们的研究结果为理解绝缘体-金属转变提供了新的思路,并促进了未来开关器件设计中的可控应变工程。

英文摘要:

Tuning the electronic properties of a matter is of fundamental interest in scientific research as well as in applications. Recently, the Mott insulator-metal transition has been reported in a pristine layered transition metal dichalcogenides 1T-TaS$_2$, with the transition triggered by an optical excitation, a gate controlled intercalation, or a voltage pulse. However, the sudden insulator-metal transition hinders an exploration of how the transition evolves. Here, we report the strain as a possible new tuning parameter to induce Mott gap collapse in 1T-TaS$_2$. In a strain-rich area, we find a mosaic state with distinct electronic density of states within different domains. In a corrugated surface, we further observe and analyze a smooth evolution from a Mott gap state to a metallic state. Our results shed new lights on the understanding of the insulator-metal transition and promote a controllable strain engineering on the design of switching devices in the future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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