Cheng-Tien Chiang

• Laser-based photoelectron spectroscopy at surfaces
• Two-photon photoemission spectroscopy / microscopy
• Double photoemission spectroscopy
• Correlated electron systems

In November 2019, Dr. Chiang initiated the Ultrafast Surface Science Laboratory focusing on the development of experimental methods to observe and control the ultrafast dynamics of electrons in solids. His primary tools are femtosecond laser pulses and their combinations with photoelectron spectroscopy at solid surfaces. The main research goals of this laboratory are: (1) direct measurements of electronic band structure of solid surfaces with momentum-resolved photoelectron spectroscopy; (2) observation of non-equilibrium distributions of excited electronic states in their momentum and energy phase space; (3) control of ultrafast electronic processes in solids. So far this laboratory has established a pair of home-built non-collinear optical parametric amplifiers and compressed their output pulse duration down to 100 femtoseconds. With this experimental development, momentum-resolved two-photon photoemission spectra have been successfully observed with their characteristic spectroscopic details on single crystals Ag(001) and NiTe2. In the near future, this laboratory is going to develop further ultrafast light sources, including high-order harmonic generation and terahertz pulses, and these advanced light sources will allow efficient control of the excited states of electrons and phonons in solids. Moreover, advanced coincidence detection of photoelectron pairs will be envisioned in the future for the direct analysis of the energy and momentum-dependent interaction between correlated electrons in solids.

• B.S., 2005, National Taiwan University, Taiwan
• M.S., 2007, National Taiwan University, Taiwan
• Dr. rer. nat., 2011, Martin-Luther-University Halle-Wittenberg, Germany

• Postdoctoral researcher, Max Planck Institute of Microstructure Physics, Germany
  (2010 Jul. ~ 2016 Mar.)
• Postdoctoral researcher, Martin-Luther-University Halle-Wittenberg, Germany
  (2016 Apr. ~ 2019 Oct.)
• Assistant research fellow, Institute of Atomic and Molecular Sciences, Taiwan
  (2019 Nov. ~ now)
• Assistant professor, Department of Physics, Tamkang University, Taiwan
  (2021 Feb. ~ 2023 June, joint appointment, 2nd semester every year)
• Assistant professor, Department of Physics, National Taiwan University, Taiwan
  (2021 Aug. ~ now, joint appointment)
• Assistant professor, Department of Physics, National Sun Yat-sen University, Taiwan
  (2024 Aug. ~ now, joint appointment)
• Assistant professor, Department of Physics, National Central University, Taiwan
  (2026 Feb. ~ now, joint appointment)

• Principal investigator of project A06 funded by German Research Foundation (DFG),
  Collaborative Research Center / Transregio 227, Ultrafast surface dynamics (2018 Jan. ~ 2019 Oct.)
• Habilitation, Martin-Luther-University Halle-Wittenberg, Germany (2020 March)