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A Fine Structure of Strongly-Bound Interlayer Exciton States in Twisted Bilayer Graphene

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Abstract

We uncover excitonic states in twisted bilayer graphene using two-photon emission and transient absorption microscopy at the single-grain level. The observed intraband and two-photon spectral peaks imply angle-dependent exciton binding energies ranging from 0.45 to 0.76 eV.

© 2017 Optical Society of America

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