Journal
PHYSICAL REVIEW B
Volume 101, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.045411
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [RTG 2247]
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Atomically thin materials are exceedingly susceptible to their dielectric environment. For transition metal dichalcogenides, sample placement on a substrate or encapsulation in hexagonal boron nitride (hBN) are frequently used. In this paper we show that the dielectric response due to optical phonons of adjacent materials influences excitons in two-dimensional (2D) crystals. We provide an analytic model for the coupling of 2D charge carriers to optical substrate phonons, which causes polaron effects similar to that of intrinsic 2D phonons. We apply the model to hBN-encapsulated WSe2, finding a significant reduction of the exciton binding energies due to dynamical screening effects.
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