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Title: Insights into hyperbolic phonon polaritons in h BN using Raman scattering from encapsulated transition metal dichalcogenide layers

Journal Article · · Physical Review. B

Alternative techniques for probing hyperbolic phonon polaritons (HPPs) in two-dimensional materials will support the development of the emerging technologies in this field. Previous reports have shown that it is possible for W Se2 monolayers in contact with the hexagonal boron nitride (h– BN) to generate HPPs in the h– BN via Raman scattering. In this paper, we set out our results on HPP Raman scattering induced in h– BN by W Se2 and Mo Se2 monolayers including multiple resonances at which the Raman scattering is enhanced. Analysis of the observed Raman line shapes demonstrates that Raman scattering allows HPPs with wave vectors with magnitudes significantly in excess of 15 000 cm–1 to be probed. Finally, we present evidence that the Raman scattering can probe HPPs with frequencies less than the expected lower bound on the reststrahlen band, suggesting new HPP physics still waits to be discovered.

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Engineering and Physical Sciences Research Council (EPSRC)
Grant/Contract Number:
SC0018171; EP/N035437/1
OSTI ID:
1979676
Journal Information:
Physical Review. B, Vol. 104, Issue 16; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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