Dynamics of electronic states in the insulating intermediate surface phase of 1T-TaS2

被引：5

作者：

Dong, Jingwei ^{[1
]}

Qi, Weiyan ^{[1
]}

Shin, Dongbin ^{[2
,3
,4
]}

Cario, Laurent ^{[5
]}

Chen, Zhesheng ^{[6
]}

Grasset, Romain ^{[1
]}

Boschetto, Davide ^{[7
]}

Weis, Mateusz ^{[7
,8
]}

Lample, Pierrick ^{[7
,8
]}

Pastor, Ernest ^{[9
]}

Ritschel, Tobias ^{[10
]}

Marsi, Marino ^{[6
]}

Taleb, Amina ^{[11
]}

Park, Noejung ^{[12
]}

Rubio, Angel ^{[3
,4
]}

Papalazarou, Evangelos ^{[6
]}

Perfetti, Luca ^{[1
]}

机构：

[1] Inst Polytech Paris, CNRS, CEA DRF IRAMIS, Lab Solides Irradies,Ecole Polytech, F-91128 Palaiseau, France

[2] Gwangju Inst Sci & Technol GIST, Dept Phys & Photon Sci, Gwangju 61005, South Korea

[3] Max Planck Inst Struct & Dynam Matter, Luruper Chaussee 149, D-22761 Hamburg, Germany

[4] Ctr Free Electron Laser Sci, Luruper Chaussee 149, D-22761 Hamburg, Germany

[5] Nantes Univ, Inst Mat Nantes Jean Rouxel, CNRS, IMN, F-44000 Nantes, France

[6] Univ Paris Saclay, CNRS, Lab Phys Solides, F-91405 Orsay, France

[7] Ecole Polytech, Inst Polytech Paris, ENSTA Paris, LOA,CNRS, 181 Chem Huniere & Joncherettes, F-91120 Palaiseau, France

[8] Univ Paris Saclay, CEA, CNRS, LIDYL, F-91191 Gif Sur Yvette, France

[9] Univ Rennes, IPR Inst Phys Rennes UMR 6251, CNRS, UMR 6251, F-35000 Rennes, France

[10] Tech Univ Dresden, Instut Festkorper und Mat phys, D-01069 Dresden, Germany

[11] Synchrotron SOLEIL, St Aubin BP 48, F-91192 Gif Sur Yvette, France

[12] Ulsan Natl Inst Sci & Technol UNIST, Dept Phys, 50 UNIST Gil, Ulsan 44919, South Korea

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 15期

关键词：

CHARGE-DENSITY WAVES;

D O I：

10.1103/PhysRevB.108.155145

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This article reports a comparative study of bulk and surface properties in the transition metal dichalcogenide 1T-TaS2. When heating the sample, the surface displays an intermediate insulating phase that persists for -10 K on top of a metallic bulk. The weaker screening of Coulomb repulsion and a stiffer charge density wave (CDW) explain such resilience of a correlated insulator in the topmost layers. Both time-resolved angle-resolved photoelectron spectroscopy and transient reflectivity are employed to investigate the dynamics of electrons and CDW collective motion. It follows that the amplitude mode is always stiffer at the surface and displays variable coupling to the Mott-Peierls band, stronger in the low-temperature phase and weaker in the intermediate one.

引用

页数：6

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