Strong-coupling charge density wave in monolayer TiSe2

被引：13

作者：

Watson, Matthew D. ^{[1
,2
]}

Rajan, Akhil ^{[1
]}

Antonelli, Tommaso ^{[1
]}

Underwood, Kaycee ^{[1
]}

Markovic, Igor ^{[1
,5
]}

Mazzola, Federico ^{[1
]}

Clark, Oliver J. ^{[1
]}

Siemann, Gesa-Roxanne ^{[1
]}

Biswas, Deepnarayan ^{[1
,6
]}

Hunter, Andrew ^{[1
]}

Jandura, Sven ^{[1
]}

Reichstetter, Janika ^{[1
]}

McLaren, Martin ^{[1
]}

Le Fevre, Patrick ^{[3
]}

Vinai, Giovanni ^{[4
]}

King, Philip D. C. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[2] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[3] Synchrotron SOLEIL, St Aubin BP48, F-91192 Gif Sur Yvette, France

[4] CNR, Ist Off Mat IOM, Lab TASC, Area Sci Pk,SS 14Km 163-5, I-34149 Trieste, Italy

[5] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[6] Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

来源：

2D MATERIALS | 2021年 / 8卷 / 01期

基金：

欧盟地平线“2020”; 英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

ARPES; CDW; monolayer; TiSe2; MBE; transition metal dichalcogenides; FILMS;

D O I：

10.1088/2053-1583/abafec

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the 2 x 2 charge density wave (CDW) in epitaxially-grown monolayer TiSe2. Our temperature-dependent angle-resolved photoemission spectroscopy measurements indicate a strong-coupling instability, but reveal how not all states couple equally to the symmetry-breaking distortion, with an electron pocket persisting to low temperature as a non-bonding state. We further show how the CDW order can be suppressed by a modest doping of around 0.06(2) electrons per Ti. Our results provide an opportunity for quantitative comparison with a realistic tight-binding model, which emphasises a crucial role of structural aspects of the phase transition in understanding the hybridisation in the ground state. Together, our work provides a comprehensive understanding of the phenomenology of the CDW in TiSe(2)in the 2D limit.

引用

页数：10

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