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arXiv 1702.08329cond-mat.mes-hall
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1 TiSe $_2$单分子膜中稳定的电荷密度波相位

Stable charge density wave phase in a 1T-TiSe$_2$ monolayer

Bahadur Singh, Chuang-Han Hsu, Wei-Feng Tsai, Vitor M. Pereira, Hsin Lin

摘要:

电荷密度波(CDW)相是物质的电荷约化状态,其中电子电荷的周期性调制经常导致电子光谱的剧烈变化,包括能隙的出现。我们分析的CDW状态在1 T-TiSe $_2$单层内的密度泛函理论框架,并表明,类似于其散装对应物,单层是不稳定的相称的$2{\times}2$周期性晶格畸变(PLD)和CDW在低温下。电子和声子谱的分析建立PLD作为稳定的$T=0$ K配置与窄带隙,而未失真和半金属状态是稳定的,只有在阈值温度以上。晶格畸变以及展开和重构的能带结构在CDW相符合良好的实验结果。我们还解决了在我们的研究结果中的电子-电子相互作用的CDW不稳定性的1 T-TiSe $_2$单分子膜的作用的证据。

英文摘要:

Charge density wave (CDW) phases are symmetry-reduced states of matter in which a periodic modulation of the electronic charge frequently leads to drastic changes of the electronic spectrum, including the emergence of energy gaps. We analyze the CDW state in a 1T-TiSe$_2$ monolayer within a density functional theory framework and show that, similarly to its bulk counterpart, the monolayer is unstable towards a commensurate $2{\times}2$ periodic lattice distortion (PLD) and CDW at low temperatures. Analysis of the electron and phonon spectrum establishes the PLD as the stable $T=0$ K configuration with a narrow bandgap, whereas the undistorted and semi-metalic state is stable only above a threshold temperature. The lattice distortions as well as the unfolded and reconstructed band structure in the CDW phase agree well with experimental results. We also address evidence in our results for the role of electron-electron interactions in the CDW instability of 1T-TiSe$_2$ monolayers.

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