Oxygen Controls Surface of Epitaxial Manganite Films
May 18, 2015 — This atomically resolved study revealed a strong link between oxygen pressure and both surface-structure formation and growth dynamics in manganite thin films. The work provides key insights into controlling atomic-level behavior necessary for growing functional materials, such as manganese oxides for electronic and solid-oxide fuel cell applications.
Phase coexistence enables switching in strained BiFeO3
July 17, 2013 — Highly strained films of multiferroic BiFeO3 are shown to exhibit a complex and temperature dependent coexistence of multiple phases, with a minority phase being a prerequisite to ferroelectric switching of the majority.
LuFeO3: a new room-temperature multiferroic material
July 01, 2013 — Atomically resolved scanning transmission electron microscopy (STEM) image of LuFeO3, a new room-temperature multiferroic. Red dots indicate the “buckling” of the Lu oxide plane, consistent with the polar structure.
Fluctuations in ultrasmall nanocrystals induce white light emission
December 06, 2012 — Combined scanning transmission electron microscopy (STEM) observations and density functional theory (DFT) calculations show why nanoparticles, which typically emit monochromatic light at an energy tuned by their size, suddenly are able to individually emit white light. White-light emission from nanoparticles is of importance due to its potential for energy efficient solid state lighting.