My research is focused on crystal and electronic structures of strongly correlated materials, energy materials and nano-materials using transmission electron microscopy and scanning transmission electron microscopy (TEM/STEM). I have been developing several quantitative methods in TEM/STEM to determine crystal and electronic structures for complex materials:
Quantitative electron diffraction, including convergent beam electron diffraction (CBED) and parallel recording of dark field imaging (PARODI), to refine structure factors for valence electron distribution of crystals (e.g. CaCu3Ti4O12, superconductors Bi2212, YBCO, MgB2 and Ba(Fe1-xCox)2As2.
Quantitative scanning transmission electron microscopy for atomic static and thermal vibrations in incommensurate layered structure, e.g. thermoelectric (Ca2CoO3)0.62CoO2.
Large angle CBED for high-order structural factor measurements which can be used to refine anharmonic thermal vibrations of thermoelectric materials.