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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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Abstract:
Matter placed in a strong magnetic field provides a fascinating laboratory in which to study exotic quantum phenomena in a highly controllable manner. This talk will summarize our recent findings of novel magnetic properties of carbon nanotubes, graphene, and graphite, probed via high-‐field magneto-‐optical spectroscopy. A magnetic field applied parallel to a nanotube introduces an Aharonov-‐Bohm phase to the electronic wave function, which leads to band gap oscillations, magnetic brightening of dark excitons, and extremely large magnetic susceptibility anisotropy. In graphene, a magnetic field applied perpendicular to the layer results in Landau quantization with non-‐equal spacings; we highlight a novel situation where electron cyclotron resonance appears in the magnetic quantum limit even though the sample is p-‐type. Finally, for graphite, we observe strongly temperature-‐dependent, asymmetric spectral lines in electronic Raman spectra in magnetic fields up to 45 T applied along the c-‐axis. The magnetic field quantizes the in-‐plane motion while the out-‐of-‐plane motion remains free, effectively reducing the system dimension from three to one. Optically created electron-‐hole pairs interact with, or “shake up,” the one-‐ dimensional Fermi sea in the lowest Landau subbands, resulting in Fermi-‐edge singularities.
