Revealing the role of electrons and phonons in the ultrafast recovery of charge density wave correlations in 1T-TiSe2

被引：56

作者：

Monney, C. ^{[1
,2
]}

Puppin, M. ^{[1
]}

Nicholson, C. W. ^{[1
]}

Hoesch, M. ^{[3
]}

Chapman, R. T. ^{[4
]}

Springate, E. ^{[4
]}

Berger, H. ^{[5
]}

Magrez, A. ^{[5
]}

Cacho, C. ^{[4
]}

Ernstorfer, R. ^{[1
]}

Wolf, M. ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Insitut, Faradayweg 4-6, D-14195 Berlin, Germany

[2] Univ Zurich, Inst Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland

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

[4] STFC Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England

[5] Ecole Polytech Fed Lausanne, Inst Phys, Crystal Growth Facil, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 16期

基金：

瑞士国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.94.165165

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using time-and angle-resolved photoemission spectroscopy with selective near-and midinfrared photon excitations, we investigate the femtosecond dynamics of the charge density wave ( CDW) phase in 1T-TiSe2 as well as the dynamics of CDW fluctuations at 240 K. In the CDW phase, we observe the coherent oscillation of the CDW amplitude mode. At 240 K, we single out an ultrafast component in the recovery of the CDW correlations, which we explain as the manifestation of electron-hole correlations. Our momentum-resolved study of femtosecond electron dynamics supports a mechanism for the CDW phase resulting from the cooperation between the interband Coulomb interaction, the mechanism of excitonic insulator phase formation, and electron-phonon coupling.

引用

页数：9

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