Details

Autor(en) / Beteiligte

• 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

Titel

Photonic crystals for nano-light in moiré graphene superlattices

Ist Teil von

• Science (American Association for the Advancement of Science), 2018-12, Vol.362 (6419), p.1153-1156

Ort / Verlag

United States: The American Association for the Advancement of Science

Erscheinungsjahr

2018

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.