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arXiv 1502.06272cond-mat.mtrl-sci
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存在单原子缺陷时1 T- TiSe2中CDW的STM显微术

STM microscopy of the CDW in 1T-TiSe2 in the presence of single atom defects

A. M. Novello, B. Hildebrand, A. Scarfato, C. Didiot, G. Monney, A. Ubaldini, H. Berger, D. R. Bowler, P. Aebi, Ch. Renner

摘要:

本文用低温扫描隧道显微镜研究了1-$T$ -TiSe $_2$中单原子缺陷的公度电荷密度波。我们发现没有显着修改的CDW晶格中的单晶与原生缺陷浓度,其中一些散装探针已经测量CDW相变签名大幅减少。STM显微照片结合原子缺陷模式的密度泛函理论建模的系统分析表明,所观察到的CDW调制位于硒表面层。缺陷图案清楚地显示在CDW相中不存在2 $H$ -多型夹杂物,如先前在室温下发现的[Titov A.N.等人,Phys. Sol. State 53,1073(2011).它们进一步为最近在该化合物中报道的手性Friedel振荡提供了另一种解释[J. Ishioka等人,B 84,245125,(2011)]。

英文摘要:

We present a detailed low temperature scanning tunneling microscopy study of the commensurate charge density wave (CDW) in 1$T$-TiSe$_2$ in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with native defects concentrations where some bulk probes already measure substantial reductions in the CDW phase transition signature. Systematic analysis of STM micrographs combined with density functional theory modelling of atomic defect patterns indicate that the observed CDW modulation lies in the Se surface layer. The defect patterns clearly show there are no 2$H$-polytype inclusions in the CDW phase, as previously found at room temperature [Titov A.N. et al, Phys. Sol. State 53, 1073 (2011). They further provide an alternative explanation for the chiral Friedel oscillations recently reported in this compound [J. Ishioka et al., Phys. Rev. B 84, 245125, (2011)].

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