Clocking the Melting Transition of Charge and Lattice Order in 1T−TaS2 with 
Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy

Petersen, Jesse C.; Kaiser, Stefan; Dean, N.; Simoncig, Alberto; Liu, Haiyun; Cavalieri, Adrian L.; Cacho, C.; Turcu, I. C. E.; Springate, E.; Frassetto, F.; Poletto, L.; Dhesi, S. S.; Berger, H.; Cavalleri, Andrea

doi:10.1103/PhysRevLett.107.177402

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Clocking the Melting Transition of Charge and Lattice Order in 1T−TaS₂ with Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy

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Externe Ressourcen

http://dx.doi.org/10.1103/PhysRevLett.107.177402
(Verlagsversion)

http://arxiv.org/abs/1010.5027
(Preprint)

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PhysRevLett.107.177402.pdf
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Zitation

Petersen, J. C., Kaiser, S., Dean, N., Simoncig, A., Liu, H., Cavalieri, A. L., et al. (2011). Clocking the Melting Transition of Charge and Lattice Order in 1T−TaS₂ with Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy. Physical Review Letters, 107(17): 177402. doi:10.1103/PhysRevLett.107.177402.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0028-15DB-A

Zusammenfassung

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−TaS₂. 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.