Quantum plasmonics, polaritons and strong light-matter interactions with 2d material heterostructures (Prof. F. Koppens)

  • Attention! Wednesday Colloquium
  • Datum: 02.11.2016
  • Uhrzeit: 14:30 - 15:30
  • Vortragender: Prof. Dr. Frank Koppens , ICFO Barcelona, Spain
  • Raum: Herbert Walther Lecture Hall
  • Gastgeber: MPQ
The controlof polaritons are at the heart of nano-photonics and opto-electronics. Two-dimensional materials have emerged as a toolbox for in-situ control of awide range of polaritons: plasmons, excitons and phonons.

By stacking these materials on top of each other, heterostructures of these materials can be controlled at atomic scale, with extremely high quality and clean interfaces. In this talk, we will show several examples of 2d material heterostructure devices with novel ways of exciting, controlling and detecting polaritons [1,2,3].

We challenge the limits of quantum light-matter interactions [5,6] as well as extremes in propagating plasmon confinement, down to the scale of a few nanometers. The advances on ultra-high quality materials allow for plasmon propagation at extremely small electron densities, with de Broglie wavelength above 50 nm. This is an excellent platform for testing quantum theories of the dynamic response of the electron system, including spatial dispersion and electron-electron correlation effects.

Finally, we present novel results on Super-Planckian energy transfer between hot electrons and hyperbolic phonon polaritons [7]. Future directions on new directions in quantum materials will be addressed.

References:

[1] Near-field photocurrent nanoscopy on bare and encapsulated graphene. A.Woessner et al., Nature Communications (2016)
[2] Thermoelectric detection and imaging of propagating graphene plasmons.Lundeberg et al., Nature Materials (2016)
[3] Ultra-confined acoustic THz graphene plasmons revealed by photocurrentnanoscopy. Alonso-Gonzalez et al., Nature Nanotechnology (2016)
[4] Real-space mapping of tailored sheet and edge plasmons in graphenenanoresonators. Nikitin et al., Nature Photonics (2016)
[5] Electro-mechanical control of optical emitters using graphene. Reserbat-Planteyet al.,Nature Communications (2016)
[6] Electrical Control of Optical Emitter Relaxation Pathways enabled byGraphene. K.J. Tielrooij et al., Nature Physics (2015)
[7] Super-Planckian electron cooling in a van der Waals stack. Principi et al.,Arxiv 1608.01516 (2016)

 
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