Academic Profile : Faculty

Assoc Prof Loh Zhi Heng_1.jpg picture
Assoc Prof Loh Zhi Heng
Associate Dean (Academic), College of Science
Associate Professor, School of Physical & Mathematical Sciences - Division of Chemistry & Biological Chemistry
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The central theme of our experimental research program is the study of coherent electron and nuclear dynamics in molecules and nanomaterials. Coherent electron motion and the ensuing quantum dynamics set forth by either optical excitation or nonresonant strong-field ionization with few-cycle laser pulses will be probed with attosecond to femtosecond time resolution. This proposed work builds upon my previous work, in which coherent electron motion in Kr+ ions that accompanies the formation of a spin-orbit wave packet is observed (Nature, 2010).

The main experimental techniques that are employed include attosecond time-resolved core-level transient absorption and transient photoelectron spectroscopies, in which soft x-ray pulses produced in a tabletop setup by high-order harmonic generation are used as probe. These soft x-ray studies are complimented with optical pump-probe measurements employing few-cycle (~5 fs) laser pulses. The ultimate goal of our studies is to exploit quantum coherences to enhance the performance of nanoelectronics and artificial light harvesting systems.
  • Coherent Quantum Dynamics Probed By Femtosecond Soft X-Ray Spectroscopy
  • Ultrafast Electron and Ion Dynamics of Ionized Liquid Water Probed by Femtosecond X-Ray Free-Electron Lasers