Journal
SCIENCE
Volume 343, Issue 6175, Pages 1125-1129Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1246833
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Funding
- U.S. Department of Energy-Office of Basic Energy Sciences (DOE-BES)
- Office of Naval Research (ONR) [MURI N00014-09-1-1063]
- DOE [DE-FG02-08ER46512]
- Air Force Office of Scientific Research (AFOSR) [FA9550-11-1-0225]
- National Research Foundation [R-144-000-295-281]
- NASA
- Office of Energy Research, BES, Materials Sciences and Engineering Division, of the U.S. DOE [DE-AC02- 05CH11231]
- Grants-in-Aid for Scientific Research [25107004, 23246116] Funding Source: KAKEN
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van der Waals heterostructures assembled from atomically thin crystalline layers of diverse two-dimensional solids are emerging as a new paradigm in the physics of materials. We used infrared nanoimaging to study the properties of surface phonon polaritons in a representative van der Waals crystal, hexagonal boron nitride. We launched, detected, and imaged the polaritonic waves in real space and altered their wavelength by varying the number of crystal layers in our specimens. The measured dispersion of polaritonic waves was shown to be governed by the crystal thickness according to a scaling law that persists down to a few atomic layers. Our results are likely to hold true in other polar van der Waals crystals and may lead to new functionalities.
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