Current research interests
- Ultrafast intense laser-matter interaction and Attosecond Physics (in particular tunneling ionization, high-order harmonic generation, above-threshold ionization, and dynamic chemical imaging of molecular structure). You can also get some idea of my work by taking a look at my recent publications and my Google Scholar.
Previous interests
- General three-body collisions theory (in particular charge-transfer processes in ion-atom, positron-atom collisions).
- Non-relativistic and relativistic atoms in external fields.
- Strongly-correlated electron systems.
Some research highlights
Ultrafast imaging of molecular structure
We imaged extremely fast breaking up of acetylene molecule in real time! The snapshot was recorded 9 femtoseconds (one femtosecond is 1/1,000,000,000,000,000 of a second) after the breakup was initiated, by the Laser-Induced Electron Diffraction (LIED) technique. Experiments were performed in the group of Prof. Jens Biegert at the ICFO. See an artist’s rendition (on the right) of the imaging process (courtesy of ICFO – The Institute of Photonic Sciences, Barcelona and Scixel.)For more details, see our paper in Science, as well as Science Perspective and press release.
Universality of returning electron wave packet in high harmonic generation
We showed that a returning electron wave packet in high harmonic generation with midinfrared laser pulses converges to a universal shape for laser wavelengths above about 3 µm. See illustration on the right for the scaled wave packet from hydrogen in intense laser field of different wavelengths from 1.2 µm to 3.2 µm. Quantum “orbits” multiple returns and HHG wavelength scaling law can also be studied within this approach.For more details, see our paper in Phys. Rev. Lett.
We made the rescattering theory quantitative
We developed the Quantitative Rescattering theory (QRS), which revealed the connection between various extremely nonlinear phenomena in strong-field physics with traditional scattering physics. This theory provides a solid theoretical foundation for novel ultrafast molecular structure imaging techniques such as the laser-induced electron diffraction (LIED) and high harmonic generation spectroscopy (HHS). See illustration on the right.For more details, see our paper in Phys. Rev. Lett. and further development for HHG and high-energy momentum spectra.