Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems
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 d...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/141043 |
| _version_ | 1826198616762482688 |
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| author | Chuang, Chern Cao, Jianshu |
| author_facet | Chuang, Chern Cao, Jianshu |
| author_sort | Chuang, Chern |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T11:07:35Z |
| format | Article |
| id | mit-1721.1/141043 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:07:35Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1410432022-03-08T03:28:39Z Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems Chuang, Chern Cao, Jianshu 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. 2022-03-07T17:48:48Z 2022-03-07T17:48:48Z 2021 2022-03-07T17:39:49Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141043 Chuang, Chern and Cao, Jianshu. 2021. "Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems." Physical Review Letters, 127 (4). en 10.1103/PHYSREVLETT.127.047402 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Chuang, Chern Cao, Jianshu Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title | Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title_full | Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title_fullStr | Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title_full_unstemmed | Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title_short | Universal Scalings in Two-Dimensional Anisotropic Dipolar Excitonic Systems |
| title_sort | universal scalings in two dimensional anisotropic dipolar excitonic systems |
| url | https://hdl.handle.net/1721.1/141043 |
| work_keys_str_mv | AT chuangchern universalscalingsintwodimensionalanisotropicdipolarexcitonicsystems AT caojianshu universalscalingsintwodimensionalanisotropicdipolarexcitonicsystems |