Crawford Lecture

Spectroscopy for the Masses (of Carbon Atoms)

Speaker(s): 
Eric Heller
Dates: 
Tuesday, May 3, 2016 - 4:00pm to 5:30pm

For some reason, the theory of the interaction of light with graphene, nanotubes, graphite, etc. got off on the wrong foot 15 years ago. The established approaches were cast aside without mention. We have developed and used the correct theory for the first time, based on light-matter perturbation and the Born-Oppenheimer approximation. With 12 years of experimental data on graphene to work with, the story of the interaction of graphene with light has...

Ballistic Branched Flow of Almost Everything

Speaker(s): 
Eric Heller
Dates: 
Monday, May 2, 2016 - 4:15pm to 6:00pm

Branched flow results from a common situation involving wave or ray propagation through weakly deflecting random media for long path lengths. In nature it affects light waves, radio and microwaves, sound waves, ocean waves and matter waves in important ways. Yet its importance is just beginning to be recognized in some of the fields it affects. For example imaging by scanning probe microscopy by the Westervelt group at Harvard recently revealed branched...