Photonic crystals for nano-light in moiré graphene superlattices

Sunku, S. S.; Ni, G. X.; Jiang, B. Y.; Yoo, H.; Sternbach, A.; McLeod, A. S.; Stauber, T.; Xiong, L.; Taniguchi, T.; Watanabe, K.; Kim, P.; Fogler, M. M.; Basov, D. N.

doi:10.1126/science.aau5144

Title: Photonic crystals for nano-light in moiré graphene superlattices

Journal Article · 05 December 2018 · Science

DOI: https://doi.org/10.1126/science.aau5144 · OSTI ID:1484842

; Ni, G. X.;

; Yoo, H.;

; McLeod, A. S.; Stauber, T.; Xiong, L.; Taniguchi, T.;

;

Graphene is an atomically thin plasmonic medium that supports highly confined plasmon polaritons, or nano-light, with very low loss. Electronic properties of graphene can be drastically altered when it is laid upon another graphene layer, resulting in a moiré superlattice. The relative twist angle between the two layers is a key tuning parameter of the interlayer coupling in thus-obtained twisted bilayer graphene (TBG). We studied the propagation of plasmon polaritons in TBG by infrared nano-imaging. We discovered that the atomic reconstruction occurring at small twist angles transforms the TBG into a natural plasmon photonic crystal for propagating nano-light. This discovery points to a pathway for controlling nano-light by exploiting quantum properties of graphene and other atomically layered van der Waals materials, eliminating the need for arduous top-down nanofabrication.

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Sponsoring Organization:: USDOE

OSTI ID:: 1484842

Journal Information:: Science, Journal Name: Science Journal Issue: 6419 Vol. 362; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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