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Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-07-21 , DOI: 10.1103/physrevlett.127.047402
Chern Chuang 1 , Jianshu Cao 1
Affiliation  

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 E0.5 scaling of the system density of states and predicts unique spectroscopic signatures including: (1) disorder-induced absorption linewidth, W(σ)σ2.8, with σ the disorder strength, (2) temperature dependent absorption linewidth, W(T)Ts+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)sin2θ. These predictions are confirmed quantitatively with numerical simulations of molecular thin films and tubules.

中文翻译:

二维各向异性偶极激子系统中的通用标度

低维激子材料因其新颖的物理和技术前景而引起了人们的极大兴趣。特别是,具有强平面内各向异性的那些是最有趣但缺乏一般分析的。我们建立了小范围内各向异性色散的通用函数形式二维偶极激子系统的极限。虽然能量在平行于平面偶极子的方向线性分散,但垂直方向是无色散的,直到线性阶,这可以用一维子系统成分之间相互作用的量子干涉效应来解释。各向异性色散导致0.5 系统状态密度的缩放并预测独特的光谱特征,包括:(1)无序诱导的吸收线宽, (σ)σ2.8, 和 σ 无序强度,(2)温度相关的吸收线宽, ()+1.5, 和 环境光谱密度的指数,以及 (3) 平面外角 θ 吸收光谱中峰分裂的依赖性, Δ(θ)2θ. 这些预测通过分子薄膜和小管的数值模拟得到定量证实。
更新日期:2021-07-21
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