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Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems
Name
PhysRevLett.127.047402.pdf
Description
Published version
Size
1021.33 KB
Format
Adobe PDF
Checksum (MD5)
30fe62d22fed9772e9dbd9ed3af5eb14
Author(s)
Chuang, Chern
Cao, Jianshu
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Chuang, Chern and Cao, Jianshu. 2021. "Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems." Physical Review Letters, 127 (4).
Version
Final published version
Abstract
Low-dimensional excitonic materials have inspired much interest owing to their novel physical and technological prospects. In particular, those with strong in-plane anisotropy are among the most intriguing but short of general analyses. We establish the universal functional form of the anisotropic dispersion in the small k limit for 2D dipolar excitonic systems. While the energy is linearly dispersed in the direction parallel to the dipole in plane, the perpendicular direction is dispersionless up to linear order, which can be explained by the quantum interference effect of the interaction among the constituents of 1D subsystems. The anisotropic dispersion results in a E^{∼0.5} scaling of the system density of states and predicts unique spectroscopic signatures including: (1) disorder-induced absorption linewidth, W(σ)∼σ^{2.8}, with σ the disorder strength, (2) temperature dependent absorption linewidth, W(T)∼T^{s+1.5}, with s the exponent of the environment spectral density, and (3) the out-of-plane angular θ dependence of the peak splittings in absorption spectra, ΔE(θ)∝sin^{2}θ. These predictions are confirmed quantitatively with numerical simulations of molecular thin films and tubules.
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DOI of Published Version
10.1103/PHYSREVLETT.127.047402
