Ultrafast Melting of a Charge-Density Wave in the Mott Insulator 1T-TaS2

被引：159

作者：

Hellmann, S. ^{[1
]}

Beye, M. ^{[2
,3
]}

Sohrt, C. ^{[1
]}

Rohwer, T. ^{[1
]}

Sorgenfrei, F. ^{[2
,3
]}

Redlin, H. ^{[5
]}

Kallaene, M. ^{[1
]}

Marczynski-Buehlow, M. ^{[1
]}

Hennies, F. ^{[4
]}

Bauer, M. ^{[1
]}

Foehlisch, A. ^{[2
,3
]}

Kipp, L. ^{[1
]}

Wurth, W. ^{[2
,3
]}

Rossnagel, K. ^{[1
]}

机构：

[1] Univ Kiel, Inst Expt & Appl Phys, D-24098 Kiel, Germany

[2] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[3] Univ Hamburg, Ctr Free Electron Laser Sci, D-22761 Hamburg, Germany

[4] Lund Univ, Max Lab, Lund, Sweden

[5] DESY, D-22607 Hamburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 18期

关键词：

TRANSITION-METAL DICHALCOGENIDES; ELECTRON-MICROSCOPY; PHASE; PHOTOEMISSION; SPECTROSCOPY; 2H-TASE2; LASER; TIME;

D O I：

10.1103/PhysRevLett.105.187401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Femtosecond time-resolved core-level photoemission spectroscopy with a free-electron laser is used to measure the atomic-site specific charge-order dynamics of the charge-density wave in the Mott insulator 1T-TaS2. After strong photoexcitation, a prompt loss of charge order and subsequent fast equilibration dynamics of the electron-lattice system are observed. On the time scale of electron-phonon thermalization, about 1 ps, the system is driven across a phase transition from a long-range charge ordered state to a quasiequilibrium state with domainlike short-range charge and lattice order. The experiment opens the way to study the nonequilibrium dynamics of condensed matter systems with full elemental, chemical, and atomic-site selectivity.

引用

页数：4

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