Experimental setup, with the enhanced light pattern on the left, the layer of opaque material and two CCD cameras measuring the transmitted light (on the right) and the reflected light (left).
Researchers from FOM and the University of Amsterdam, in collaboration with their Japanese partners, have determined directly the relation between the bandgap energy of single cesium lead bromide nanocrystals (CsPbBr3
) and their size and shape. By studying individual nanocrystals being either isolated or surrounded by 'neighbors', they explicitly visualized for the first time band structure modification introduced by effective coupling between semiconductor nanocrystals upon close contact.
Rigid materials break more easily than floppy ones. With this simple observation in mind, physicists have found a way to predict and control the width of cracks. Theoretical understanding of how materials break is useful in for example the production of cars or screens.