Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects

被引：35

作者：

Novello, A. M. ^{[1
]}

Hildebrand, B. ^{[2
,3
]}

Scarfato, A. ^{[1
]}

Didiot, C. ^{[2
,3
]}

Monney, G. ^{[2
,3
]}

Ubaldini, A. ^{[1
]}

Berger, H. ^{[4
]}

Bowler, D. R. ^{[5
,6
]}

Aebi, P. ^{[2
,3
]}

Renner, Ch. ^{[1
]}

机构：

[1] Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva 4, Switzerland

[2] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[3] Univ Fribourg, Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland

[4] Ecole Polytech Fed Lausanne, Inst Genie Atom, CH-1015 Lausanne, Switzerland

[5] UCL, London Ctr Nanotechnol, London WC1E 6BT, England

[6] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

TISE2; TRANSITION; CHARACTERS; LEVEL; STATE; PHASE;

D O I：

10.1103/PhysRevB.92.081101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge density wave (CDW) in 1T-TiSe2 in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with native defect concentrations where some bulk probes already measure substantial reductions in the CDW phase transition signature. A systematic analysis of STM micrographs combined with density functional theory modeling of atomic defect patterns indicate that the observed CDW modulation lies in the Se surface layer. The defect patterns clearly show there are no 2H-polytype inclusions in the CDW phase, as previously found at room temperature [A. N. Titov et al., Phys. Solid 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)].

引用

页数：4

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