The Mesoscale Materials Laboratory investigates light-matter interactions bulk solids and in films, and at interfaces, and on surfaces. Of particular interest are polar insulators and ferroelectric semiconductors, and in the coupling of surface chemical environment with buried interfaces; new dielectric metamaterials; and new magnetoferroelectrics. We also investigate the properties and control of optically-generated hot carriers in novel optoelectronic device paradigms. Potential applications include high-efficiency and inexpensive photovoltaic solar energy conversion, new modes of sensing external stimuli and of capturing, converting, and conveying information.
We use an array of laser and optical spectroscopic, scanned local, and non-local probe methods spanning multiple length scales, energy and temperature ranges, and chemical environments, to manipulate and analyze atomic and electronic structure. We use physical vapor deposition and characterization to study growth of new complex oxide film materials. We investigate epitaxial stabilization of amorphous films produced by atomic layer deposition, promising for low-energy, eco-friendly, and manufacturing-scalable processing.
Semiconducting ferroelectric oxide perovskite.
I. Grinberg et al. Nature (2013).
Illustration credit on main page slider: Felice Macera.
Schematic illustration of atomic layer deposition (ALD) of amorphous ternary oxide film, and cross-section TEM of annealed BiFeO3 obtained via ALD and epitaxial stabilization following annealing.
A. Akbashev et al. Nano Lett. 2013.
Wavelength-tunable real-space hot electron transfer and negative differential resistance, tunable phase, and illustration in a co-axial core-shell semiconductor nanowire.
G. Chen et al. Phys. Rev. Lett. 2011. Illustration credit: Felice Macera.