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

Yuanyuan Yang; Tianwei Tang; Shaofeng Duan; Chaocheng Zhou; Duxing Hao; Wentao Zhang

doi:10.1063/1.5090439

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

Strongly Correlated Electrons 2020-03-03 v1 Superconductivity

Authors: Yuanyuan Yang , Tianwei Tang , Shaofeng Duan , Chaocheng Zhou , Duxing Hao , Wentao Zhang

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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).

Keywords

time- and angle-resolved photoemission spectroscopy yb femtosecond laser probe photon energy kbe2bo3f2 crystal babo crystal time resolution

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@article{arxiv.2003.00515,
  title  = {A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV},
  author = {Yuanyuan Yang and Tianwei Tang and Shaofeng Duan and Chaocheng Zhou and Duxing Hao and Wentao Zhang},
  journal= {arXiv preprint arXiv:2003.00515},
  year   = {2020}
}

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8 pages, 5 figures

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

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