A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV

Abstract

We present the development of a time- and angle-resolved photoemission spectroscopy based on a Yb-based femtosecond laser and a hemispherical electron analyzer. The energy of the pump photon is tunable between 1.4 and 1.9 eV, and the pulse duration is around 30 fs. We use a KBe${}_2$BO${}_3$F${}_2$ non-linear optical crystal to generate probe pulses, of which the photon energy is up to 6.7 eV, and obtain an overall time resolution of 1 ps and energy resolution of 18 meV. In addition, $\beta$-BaB${}_2$O${}_4$ crystals are used to generate alternative probe pulses at 6.05 eV, giving an overall time resolution of 130 fs and energy resolution of 19 meV. We illustrate the performance of the system with representative data on several samples (Bi${}_2$Se${}_3$, YbCd${}_2$Sb${}_2$, FeSe).

arXiv comment8 pages, 5 figures

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• A newly-designed femtosecond KBe${}_2$BO${}_3$F${}_2$ device with pulse duration down to 55 fs for time- and angle-resolved photoemission spectroscopy
• A sample-position-autocorrection system with precision better than 1 \um~in angle-resolved photoemission experiments
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Identification of metastable lattice distortion free charge density wave at photoinduced interface via TRARPES
• Optical manipulation of the topological phase in ZrTe5 revealed by time- and angle-resolved photoemission