Optical Properties of Single Layer Cu2WSe4 from the Ab Initio Bethe-Salpeter Equation Method [0.03%]
基于第一性原理Bethe-Salpeter方程方法的单层Cu2WSe4的光学性质研究
Tarik Ouahrani,A Esquembre Kučukalić,R M Boufatah et al.
Tarik Ouahrani et al.
The computed binding energies for both bright and dark excitons are considerably larger than those that are generally necessary for standard photovoltaic applications.
Erratum for the Report "Directly visualizing the momentum-forbidden dark excitons and their dynamics in atomically thin semiconductors" by Julien Madéo et al [0.03%]
关于报告“直接观察原子薄半导体中动量禁止的暗激子及其动力学”（朱利安·马德奥等人）的勘误表
Published Erratum
Science (New York, N.Y.). 2025 May 22;388(6749):eadz0178. DOI:10.1126/science.adz0178 2025
Ultrafast Bright-to-Dark Exciton Relaxation in Bilayer Borophene Driven by Strong Excitonic Effects [0.03%]
强激子效应驱动的双层硼烯中超快亮激子到暗激子弛豫
Yunlei Wang,Haifeng Lv,Xiaojun Wu
Yunlei Wang
Furthermore, the dark excitons undergo nonradiative recombination on a picosecond time scale (∼14 ps at room temperature).
Dual Action Spectroscopy Exposes the Bright and Dark Excitons of Room-Temperature WSe2 [0.03%]
双光谱学揭示室温WSe2的亮激子和暗激子
Joseph Wragg,Luca Bolzonello,Ludovica Donati et al.
Joseph Wragg et al.
While it has long been accepted that the role of momentum dark excitons in the photoresponse of transition metal dichalcogenides (TMDs) is critical, their weak optical signature inhibits their study through conventional means....Here we expose the room-temperature contributions of both bright and dark excitons to the behavior of a TMD, WSe2, from monolayer to multilayer to bulk....While bright excitons naturally dominate the luminescence response of the material, dark excitons dominate the current response. Notably, the dark KK' exciton is more accessible than the ground state KΛ, while current maps reveal a disparity in the diffusivity of the two states.
Efficient light upconversion via resonant exciton-exciton annihilation of dark excitons in few-layer transition metal dichalcogenides [0.03%]
通过少层过渡金属二硫化物中暗激子的共振激子-激子湮灭实现高效光上转换
Yi-Hsun Chen,Ping-Yuan Lo,Kyle W Boschen et al.
Yi-Hsun Chen et al.
Our joint theory-experiment study attributes the upconversion photoluminescence to a resonant exciton-exciton annihilation involving a pair of dark excitons with opposite momenta, followed by the spontaneous emission of upconverted bright excitons, which can have a high upconversion efficiency.
Diffusion of Valley-Coherent Dark Excitons in a Large-Angle Incommensurate Moiré Homobilayer [0.03%]
大角度非公度莫尔同质双层中的谷相干暗激子扩散
Arnab Barman Ray,Trevor Ollis,K R Sethuraj et al.
Arnab Barman Ray et al.
Recent research in twistronics, particularly in small-angle twisted bilayers of transition metal dichalcogenides, has uncovered exciting phenomena like periodic arrays of excitonic quantum emitters, exotic many-body states, and long-lived i...
Large-Area Bright Emission of Plasmon-Coupled Dark Excitons at Room Temperature [0.03%]
室温大面积暗 exciton 表面等离激元耦合亮发射
Hyun Jeong,Hyeong Chan Suh,Ga Hyun Cho et al.
Hyun Jeong et al.
Brightening dark excitons in transition metal dichalcogenide monolayers (MLs) can provide large-area ultrathin devices for applications in quantum information science and optoelectronics....In this study, an efficient approach is presented for brightening dark excitons at room temperature over a large area of a WSe2 ML via coupling between plasmons and dark excitons....When a WSe2 ML is placed on gold micropillars (Au MPs), dark excitons are efficiently coupled to strongly localized surface plasmons at the edges of the Au MPs, along with a strong photoluminescence (PL) emission.
Pavel V Kolesnichenko,Lukas Wittenbecher,Qianhui Zhang et al.
Pavel V Kolesnichenko et al.
While bright excitons have been thoroughly scrutinized, dark excitons have been much less investigated, as they are not directly observable with far-field spectroscopy....However, with their nonzero momenta, dark excitons are significant for applications requiring long-range transport or coupling to external fields....We access such dark excitons in WS2 monolayer using transient photoemission electron microscopy with subdiffraction limited spatial resolution (75 nm) and exceptionally high temporal resolution (13 fs). Image time series of the monolayer are recorded at several different fluences.
Anomalous Behavior in Dark-Bright Splitting Impacts the Biexciton Binding Energy in (BA)2(MA)n-1PbnBr3 n+1 (n = 1-3) [0.03%]
(n=1-3)(BA)₂(MA) _n-n+1PbnBr3中暗亮裂分的异常行为影响双激子结合能
Jun Sang Cho,Hyeon-Kyeong So,Adam Balvanz et al.
Jun Sang Cho et al.
This anomaly results in the strongest biexciton binding between two dark excitons occurring at n = 2, rather than at n = 1 as initially hypothesized.
Probing Dark Excitons in Monolayer MoS_{2} by Nonlinear Two-Photon Spectroscopy [0.03%]
利用非线性双光子谱学探测二硫化钼单层中的暗激子
Chenjiang Qian,Viviana Villafañe,Pedro Soubelet et al.
Chenjiang Qian et al.
Moreover, our results indicate that dark excitons have significant potential for nonlinear quantum devices based on their nontrivial excitonic photophysics.
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