Hyperbolic Dispersion Arising from Anisotropic Excitons in Two-Dimensional Perovskites
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Northwestern Univ., Evanston, IL (United States)
- Northern Illinois Univ., DeKalb, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Flexterra Corp., Skokie, IL (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)
Excitations of free electrons and optical phonons are known to permit access to the negative real part of relative permittivities (ϵ' < 0) that yield strong light-matter interactions. However, negative ϵ' arising from excitons has been much less explored. Via development of a dielectric-coating based technique described herein, we report fundamental optical properties of two-dimensional hybrid perovskites (2DHPs), composed of alternating layers of inorganic and organic sublattices. Low members of 2DHPs (N = 1 and N = 2) exhibit negative ϵ' stemming from the large exciton binding energy and sizable oscillator strength. Furthermore, hyperbolic dispersion (i.e., ϵ' changes sign with directions) occurs in the visible range, which has been previously achieved only with artificial metamaterials. Such naturally occurring, exotic dispersion stems from the extremely anisotropic excitonic behaviors of 2DHPs, and can intrinsically support a large photonic density of states. Here, we suggest that several other van der Waals solids may exhibit similar behaviors arising from excitonic response.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); Northwestern University, Materials Research Science and Engineering Center (NU-MRSEC); Flexterra, Inc.
- Grant/Contract Number:
- AC02-06CH11357; SC0012541
- OSTI ID:
- 1477741
- Alternate ID(s):
- OSTI ID: 1471446
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 12; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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