Local resilience of the 1T-TiSe2 charge density wave to Ti self-doping

被引：18
作者：
Hildebrand, B. [1 ,2 ]
Jaouen, T. [1 ,2 ]
Didiot, C. [1 ,2 ]
Razzoli, E. [1 ,2 ]
Monney, G. [1 ,2 ]
Mottas, M. -L. [1 ,2 ]
Vanini, F. [1 ,2 ]
Barreteau, C. [3 ]
Ubaldini, A. [3 ]
Giannini, E. [3 ]
Berger, H. [4 ]
Bowler, D. R. [5 ,6 ]
Aebi, P. [1 ,2 ]
机构：
[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland
[2] Univ Fribourg, Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland
[3] Univ Geneva, Dept Quantum Matter Phys, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, 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 | 2017年 / 95卷 / 08期
关键词：
TRANSITION-METAL DICHALCOGENIDES; SUPERCONDUCTIVITY; DYNAMICS; ORIGIN;
D O I：
10.1103/PhysRevB.95.081104
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In Ti-intercalated self-doped 1T-TiSe2 crystals, the charge density wave (CDW) superstructure induces two nonequivalent sites for Ti dopants. Recently, it has been shown that increasing Ti doping dramatically influences the CDW by breaking it into phase-shifted domains. Here, we report scanning tunneling microscopy and spectroscopy experiments that reveal a dopant-site dependence of the CDW gap. Supported by density functional theory, we demonstrate that the loss of the long-range phase coherence introduces an imbalance in the intercalated-Ti site distribution and restrains the CDW gap closure. This local resilient behavior of the 1T-TiSe2 CDW reveals an entangled mechanism between CDW, periodic lattice distortion, and induced nonequivalent defects.
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页数：5
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