Advancing non-equilibrium ARPES experiments by a 9.3 eV coherent ultrafast photon source

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• 作者：F. Cilento^a ; ^b ; ^{federico.cilento@elettra.eu" class="auth_mail" title="E-mail the corresponding author} ; A. Crepaldi^a ; G. Manzoni^c ; A. Sterzi^c ; M. Zacchigna^b ; Ph. Bugnon^d ; H. Berger^d ; F. Parmigiani^a ; ^c ; ^e
• 刊名：Journal of Electron Spectroscopy and Related Phenomena
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：207
• 期：Complete
• 页码：7-13
• 全文大小：1317 K

文摘

The quest for investigating the non-equilibrium dynamics of the band structure of strongly-correlated materials over their entire Brillouin zone is a primary objective. However, the actual ultrafast UV light sources are not suitable for addressing several critical questions in the field. Here we report on a novel light source generating sub-250 fs, 9.3 eV photon energy light pulses at 250 kHz repetition rate, obtained via third-harmonic generation in Xe of frequency-doubled 50 fs laser pulses at 1.55 eV. By reporting the measured band dispersion of a Cu(111) crystal and the non-equilibrium dynamics of the Bi₂Se₃ topological insulator, we prove that this source is suitable for studying the non-equilibrium dynamics of the entire Fermi surface of several complex materials, with high signal statistics and limited space-charge effect.