Orbital-and kz-Selective Hybridization of Se 4p and Ti 3d States in the Charge Density Wave Phase of TiSe2

被引：63

作者：

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

Clark, Oliver J. ^{[1
]}

Mazzola, Federico ^{[1
]}

Markovic, Igor ^{[1
,3
]}

Sunko, Veronika ^{[1
,3
]}

Kim, Timur K. ^{[2
]}

Rossnagel, Kai ^{[4
,5
,6
]}

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

[4] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[5] Christian Albrechts Univ Kiel, Ruprecht Haensel Lab, D-22607 Hamburg, Germany

[6] DESY, D-22607 Hamburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

BANDS;

D O I：

10.1103/PhysRevLett.122.076404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We revisit the enduring problem of the 2 x 2 x 2 charge density wave (CDW) order in TiSe2, utilizing photon energy-dependent angle-resolved photoemission spectroscopy to probe the full three-dimensional high- and low-temperature electronic structure. Our measurements demonstrate how a mismatch of dimensionality between the 3D conduction bands and the quasi-2D valence bands in this system leads to a hybridization that is strongly k(z) dependent. While such a momentum-selective coupling can provide the energy gain required to form the CDW, we show how additional "passenger" states remain, which couple only weakly to the CDW and thus dominate the low-energy physics in the ordered phase of TiSe2.

引用

页数：6

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