Unconventional valley-dependent optical selection rules and landau level mixing in bilayer graphene

Long Ju, Lei Wang, Xiao Li, Seongphill Moon, Mike Ozerov, Zhengguang Lu, Takashi Taniguchi, Kenji Watanabe, Erich Mueller, Fan Zhang, Dmitry Smirnov, Farhan Rana and Paul L. McEuen ()
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Long Ju: Kavli Institute at Cornell for Nanoscale Science
Lei Wang: Kavli Institute at Cornell for Nanoscale Science
Xiao Li: City University of Hong Kong
Seongphill Moon: National High Magnetic Field Laboratory
Mike Ozerov: National High Magnetic Field Laboratory
Zhengguang Lu: National High Magnetic Field Laboratory
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Erich Mueller: Cornell University
Fan Zhang: University of Texas at Dallas
Dmitry Smirnov: National High Magnetic Field Laboratory
Farhan Rana: Cornell University
Paul L. McEuen: Kavli Institute at Cornell for Nanoscale Science

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Selection rules are of vital importance in determining the basic optical properties of atoms, molecules and semiconductors. They provide general insights into the symmetry of the system and the nature of relevant electronic states. A two-dimensional electron gas in a magnetic field is a model system where optical transitions between Landau levels (LLs) are described by simple selection rules associated with the LL index N. Here we examine the inter-LL optical transitions of high-quality bilayer graphene by photocurrent spectroscopy measurement. We observed valley-dependent optical transitions that violate the conventional selection rules Δ|N| = ± 1. Moreover, we can tune the relative oscillator strength by tuning the bilayer graphene bandgap. Our findings provide insights into the interplay between magnetic field, band structure and many-body interactions in tunable semiconductor systems, and the experimental technique can be generalized to study symmetry-broken states and low energy magneto-optical properties of other nano and quantum materials.

Date: 2020
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DOI: 10.1038/s41467-020-16844-y

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