Event Time: Thursday, April 4, 2019 | 2:00 pm - 3:30 pm
Event Location:
BRIM 311
Add to Calendar 2019-04-04T14:00:00 2019-04-04T15:30:00 CM Seminar: Quantum materials: insights from near field nano-optics Event Information: In 1944 Hans Bethe reported on “the diffraction of electromagnetic radiation by a hole small compared with the wave-length” [Physical Review 66, 163 (1944)]. This seminal paper was among the early precursors to a new and vibrant area of research: near field nano-optics. I will discuss recent nano-optical experiments on quantum materials including graphene and other atomically layered crystals. Central to the nano-optical exploration of quantum materials is the notion of polaritons: hybrid light-matter modes that are omnipresent in polarizable media [Nature Materials 16, 1077 (2017)]. Infrared nano-optics allows one to directly image polaritonic standing waves yielding rich insights into the electronic phenomena of the host material supporting polaritons [Science 354, 195 (2016)]. We utilized this novel general approach to investigate the physics of ballistic electronic transport in graphene [Nature 557, 530 (2018)] and of topological conducting channels also  in graphene [Science 362, 1153 (2018)].   Event Location: BRIM 311
Event Time: Friday, May 17, 2019 | 2:00 pm - 3:30 pm
Event Location:
BRIM 311
Add to Calendar 2019-05-17T14:00:00 2019-05-17T15:30:00 CM Seminar: Vector beams, high harmonic generation and THz solenoidal magnetic fields Event Information: Abstract:  We use intense vector beams to generate high harmonics or to create solenoidal currents in solids or gases.  We create circularly polarized harmonics and we predict THz magnetic fields reaching the scale that is only available at user facilities. Event Location: BRIM 311