Defect-state mediated excitonic transitions and associated electrical nature in exfoliated MoS2 nanostructures

2020 ◽  
Author(s):  
S. Reshmi ◽  
Manu Mohan ◽  
K. Bhattacharjee
Keyword(s):  
Defect State ◽  
Excitonic Transitions

Band gap and defect state engineering in a multi-stub phononic crystal plate

2015 ◽  
Vol 117 (15) ◽  
pp. 154301 ◽  
Author(s):  
Ping Jiang ◽  
Xiao-Peng Wang ◽  
Tian-Ning Chen ◽  
Jian Zhu
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Crystal Plate ◽  
Defect State

Temperature Dependence of Contactless Electroreflance Spectroscopy of C-Plane ZnO Bulk

2011 ◽  
Vol 341-342 ◽  
pp. 6-10
Author(s):  
I Fan Lin ◽  
Chung Fu Chang ◽  
Dong Po Wang
Keyword(s):  
Temperature Dependence ◽  
Average Field ◽  
Excitonic Transitions ◽  
Best Fit

Contactless electroreflectance（CER）spectra of c-plane ZnO bulk have been measured from 20 to 300 K. Photoreflectance（PR）spectrum of ZnO bulk has also been measured at 300 K. The CER spectrum is red-shifted with respect to the PR spectrum at 300 K. It is known that the average field experienced in the CER is larger than that of the PR. In addition, the features of PR or CER is blue-shifted when the field becomes larger if they belong to band-to-band transitions. Hence, the observed features are excluded from band-to-band transitions and are attributed to excitonic transitions. The CER spectra were then fitted by Lorentzian profiles. The energies of the A（B）, B（A）, and C excitonic transitions at 0K, which were obtained by the best fit of Varshni’s equation, are 3.419, 3.436, and 3.482 eV, respectively.

scholarly journals Characteristics of defect states in periodic railway track structure

2021 ◽  
pp. 146134842110382
Author(s):  
Qiang Yi ◽  
Caiyou Zhao ◽  
Ping Wang
Keyword(s):  
Transmission Coefficient ◽  
Peak Frequency ◽  
Railway Track ◽  
Track Structure ◽  
Defect State ◽  
Defect States ◽  
Transform Method ◽  
Vibration Transmission ◽  
Local Resonance ◽  
Resonance Modes

To overcome the ill-conditioned matrix problem of the traditional transfer matrix method, the Floquet transform method and supercell technology are used to study the defect states of the periodic track structure. By solving the equations of the supercell directly, the propagation characteristics of elastic waves in the track structure with defects are analyzed. The existence of defects destroys the periodicity of track structure, thus resulting in the formation of defect states within the band gaps. Moreover, the elastic wave is localized near the defect position at the frequency of the defect state. The formation mechanism of the defect state in track structure can be explained by the local resonance at the defect. With the expansion of the defect range, the number of local resonance modes that can be formed near the defect increases, thus generating multiple defect states. Furthermore, the defect state enhances the vibration of the structure adjacent to the defect. Therefore, the vibration transmission coefficient in a finite-length range can be used to detect the defect characteristics in the track structure, and the defect degree can be evaluated by the peak frequency of the vibration transmission coefficient within the band gap.

Effect of defect state on photon synergistic process in KLu2F7:Yb3+, Er3+ nanoparticles

2016 ◽  
Vol 242 ◽  
pp. 222-227 ◽  
Author(s):  
Wenjuan Bian ◽  
Wei Lu ◽  
Yushuang Qi ◽  
Xue Yu ◽  
Dacheng Zhou ◽  
...  
Keyword(s):  
Defect State

Excitonic transitions in Be-doped GaAs/AlAs multiple quantum well

2016 ◽  
Vol 25 (4) ◽  
pp. 047302
Author(s):  
Wei-Min Zheng ◽  
Su-Mei Li ◽  
Wei-Yan Cong ◽  
Ai-Fang Wang ◽  
Bin Li ◽  
...  
Keyword(s):  
Quantum Well ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
Excitonic Transitions
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