title: Clocking the melting transition of charge and lattice order in 1T-TaS2 with ultrafast extreme-ultraviolet angle-resolved photoemission spectroscopy.
abstract: We use time- and angle-resolved photoemission spectroscopy with sub-30-fs extreme-ultraviolet pulses to map the time- and momentum-dependent electronic structure of photoexcited 1T-TaS(2). This compound is a two-dimensional Mott insulator with charge-density wave ordering. Charge order, evidenced by splitting between occupied subbands at the Brillouin zone boundary, melts well before the lattice responds. This challenges the view of a charge-density wave caused by electron-phonon coupling and Fermi-surface nesting alone, and suggests that electronic correlations play a key role in driving charge order.
authors: Department of Physics, Oxford University, Clarendon Laboratory, Oxford, United Kingdom.
authors: J C
authors: JC
authors: Petersen
authors: S
authors: S
authors: Kaiser
authors: N
authors: N
authors: Dean
authors: A
authors: A
authors: Simoncig
authors: H Y
authors: HY
authors: Liu
authors: A L
authors: AL
authors: Cavalieri
authors: C
authors: C
authors: Cacho
authors: I C E
authors: IC
authors: Turcu
authors: E
authors: E
authors: Springate
authors: F
authors: F
authors: Frassetto
authors: L
authors: L
authors: Poletto
authors: S S
authors: SS
authors: Dhesi
authors: H
authors: H
authors: Berger
authors: A
authors: A
authors: Cavalleri