Topological effects in 2D plasmons


About the Project

Nontrivial Berry phase in its ground state electronic wavefunction has recently inspired its experimental observation in 2D materials, such as valley Hall transport and circular dichroism in gapped Dirac materials. However, it was predicted that the underlying Berry phase of the electronic ground state should also imbue the collective electronic excitations with a completely new non-reciprocal character. This project will investigate two fundamental questions: i) How are the collective modes, including plasmons-polaritons of topological materials, impacted by the non-trivial topology of their single-particle electronic states? ii) How to harness topological plasmons for creating new optoelectronic devices? The program integrates condensed matter physics, materials and electromagnetics modeling, advanced inverse photonic system design, state-of-the-art 2D materials device fabrication, advanced hyperspectral imaging with near field infrared techniques, and mid-infrared integrated photonics components. This 4 years program involves University of Minnesota, Columbia University, Stanford University and the University of Pennsylvania.


Image: Electromagnetic simulation shows the launching of non-reciprocal edge plasmons and bulk plasmon by a linear dipole positioned at the edge of a medium with non-zero net Berry curvature. Image by Anshuman Kumar.


Theory team

Prof. Tony Low (Lead)
Department of Electrical & Computer Engineering
University of Minnesota
Email: tlow at umn dot edu
Prof. Eugene Mele
Department of Physics
University of Pennsylvania
Email: mele at upenn dot edu

Experiment team

Prof. Dimitri Basov
Department of Physics
Columbia University
Email: db3056 at columbia dot edu
Prof. Jelena Vuckovic
Department of Electrical Engineering
Stanford University
Email: jela at stanford dot edu
Prof. James Hone
Department of Mechanical Engineering
Columbia University
Email: jh2228 at columbia dot edu



To be updated



To be updated



This work is supported by the National Science Foundation under grant number NSF/EFRI-1741660