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Department of Physics pres.

CM Theory Seminar | Cyclotron Resonance Spectroscopy of Symmetry Broken States in Monolayer Graphene

Erik Henriksen (Washington University)

Cyclotron resonance—the resonant absorption of light by charge carriers in a strong magnetic field—is widely used to measure the effective band mass of (semi-)conducting materials. This works because the CR absorption in systems having a parabolic dispersion—a reasonable description of most materials—is unaffected by inter-particle interactions. An intriguing corollary is that, for instance, in high mobility GaAs heterostructures when the electronic transport shows remarkably complex behavior in the fractional quantum Hall regime, there is still only a single cyclotron resonance peak that is qualitatively little different from a low-mobility device. But: in materials with a linear dispersion such as graphene, this proscription on spectroscopy of interactions does not hold. We have built a dedicated infrared magnetospectroscopy setup for exploring the cyclotron resonance of interacting Dirac systems, and will report progress including an exciting observation of full integer symmetry breaking of the underlying Landau levels in monolayer graphene. We will also discuss plans for `shining light’ on other correlated electron systems.

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