排序方式: 共有7条查询结果,搜索用时 109 毫秒
1
1.
We study the negatively and positively charged trions in bulk materials in the effective mass approximation within the framework of a potential model. The binding energies of trions in various semiconductors are calculated by employing Faddeev equation in configuration space. Results of calculations of the binding energies for are consistent with previous computational studies and are in reasonable agreement with experimental measurements, while the is unbound for all considered cases. The mechanism of formation of the binding energy of trions is analyzed by comparing contributions of a mass-polarization term related to kinetic energy operators and a term related to the Coulomb repulsion of identical particles. 相似文献
2.
We present a finite difference calculation of the binding energies of localized trions in quasi-one-dimensional quantum wires (QWRs). It is found that both the lateral confinement and the localization potential have a strong effect on the relative stability of the trions. It is confirmed that a weak localization potential not only enhances the binding energy but also changes the relative stability of the positive and negative trions. Our theoretical model is in good accord with a recent experiment regarding photoluminescence in disordered QWRs. 相似文献
3.
Cheng-Bing Qin Xi-Long Liang Shuang-Ping Han Guo-Feng Zhang Rui-Yun Chen Jian-Yong Hu Lian-Tuan Xiao Suo-Tang Jia 《Frontiers of Physics》2021,16(1):12501-150
Monolayer transition metal dichalcogenides have emerged as promising mat erials for opt oelectTonic and nanophotonic devices.However,the low photoluminescence(PL)quantum yield(QY)hinders their various potential applications.Here we engineer and enhance the PL intensity of monolayer WS2by femtosecond laser irradiation.More than two orders of magnitude enhancement of PL intensity as compared to the as-prepared sample is determined.Furthermore,the engineering time is shortened by three orders of magnitude as compared to the improvement of PL intensity by continuous-wave laser irradiation.Based on the evolution of PL spectra,we attribute the giant PL enhancement to the conversion from trion emission to exciton,as well as the improvement of the QY when exciton and trion are localized to the new-formed defects.We have created microstructures on the monolayer WS2based on the enhancement of PL intensity,where the engineered structures can be stably stored for more than three years.This flexible approach with the feature of excellent long-term storage stability is promising for applications in information storage,display technology,and opto electronic devices. 相似文献
4.
《Current Applied Physics》2020,20(2):272-276
Photoinduced trion absorption in the time- and spectrum-resolved circular dichroism (CD) of a pristine WSe2 monolayer is manifested by a pronounced trion transition when the circular polarization of a probe pulse is opposite to that of the preceding pump pulse. Valley-polarized trion absorption enables visualization of the inter-valley scattering dynamics of spin-polarized carriers, revealing a large excitation dependence that supports the valley depolarization through carrier-carrier scattering. Moreover, the CD and the Faraday rotation, which are both dominated by the spin-polarized shift of the A-exciton absorbance and the photoinduced trion transition, are confirmed to satisfy the Kramers-Kronig relationship between each other. 相似文献
5.
XIE Wen-Fang 《理论物理通讯》2006,45(3):565-567
In this paper, a negatively charged exciton trapped by a
spherical parabolic quantum dot has been investigated. The
energy spectra of low-lying states are calculated by means of
matrix diagonalization. The important feature of
the low-lying states of the negatively charged excitons in a spherical
quantum dot is obtained via an analysis of the energy spectra. 相似文献
6.
XIE WenFang 《理论物理通讯》2000,34(3):391-395
The method of few-body physics is applied to treating negatively charged excitons in a quantum disk. The energies of low-lying states of a negatively charged exciton are calculated for a few values of the electron-to-hole mass ratio. A new bound state of a negatively charged exciton in a quantum disk with orbital angular momentum L = 1 and the triplet state of the two bound electrons are predicted. The binding energy of a negatively charged exciton asfunction of disk radius for the heavy hole and the light hole is investigated. 相似文献
7.
We have analyzed the energetics of decay of the X
minus trion (exciton + electron) on the assumption that the exciton and trion are independent excitations of a single twodimensional semiconducting quantum well. For the first time, it has been shown that in filling a well with electrons from a selective donordoped matrix, the binding energy of the trion (of the electron with the exciton) increases linearly with a shift of the Fermi level into the depth of the c band. This agrees with the wellknown experimental data on the lowtemperature radiative decay (photoluminescence) of trions in the heterostructures ZnSe/Zn0.89Mg0.11S0.18Se0.82 and CdTe/Cd0.7Mg0.3Te. 相似文献
1