安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Excitation = Exciton? - Physics Stack Exchange
An exciton is a bound interaction between the electron and its hole It has a lower energy than the lowest conduction band state, and it is often observable through photoluminescence (at a wavelength longer than what's needed to excite the electron-hole pair) as the pair recombines Not every material demonstrates these exciton-specific properties
- How to understand exciton? - Physics Stack Exchange
An exciton really is a electron coupled to a hole, just as you said A electron gets excited to a higher band, leaving a hole in the lower band behind (a bit like a bubble on top of a liquid) You can disregard the other electrons (and holes) in this picture, as they are smeared out and just form the background
- quantum mechanics - What are dark excitons and how to find them . . .
In cases when the exciton's electric dipole orientation is ortoghonal to the polarization of light, such an exciton is also dark In cases when excitons are placed between the two mirrors then those excitons that are in the vicinity of the nodes of the cavity mode are also dark, because electric field at those locations is not supported by the
- Spin and wavefunction of Excitons - Physics Stack Exchange
In problems where the exciton is tied to an optical excitation, we can compare its spin to that of the band before the excitation - knowing that the photon carries spin 1 In the naïve theory starting with non-interacting electrons and holes, this is then collapsed onto the optical selection rules for the heavy and the light holes or something
- How do experimentalists measure the exciton binding energy?
The exciton binding energy in semiconductors is determined theoretically by the energetic difference between the fundamental gap and the optical gap or, in other words, as the energetic difference of the fundamental gap and the first exciton peak in an optical spectrum My question is related to experiment
- Whats the difference between an exciton and a geminate pair?
The electron in the electron-accepting material and the hole in the electron-donor material remain bound by electrostatic interaction, so they exist as a geminate pair The binding energy of this pair is less as compared to the exciton in the homogeneous medium by the difference in electron affinities of the contacting materials
- solid state physics - Energy of exciton formation in semiconductors . . .
An exciton can form when a material absorbs a photon of higher energy than its bandgap I looked at absorption enhancing effects of excitons, and am aware of the Hydrogenic series for an exciton It seems to me that the absorption of light energy below the bandgap is due to exciton formation
- Excitons in metals-do they exist? - Physics Stack Exchange
2) The electronic description of a metal usually only includes one (half-filled) band, so there exist no two different particles in this system (electrons and holes) to form an exciton Note, the more appropriate quasi-particle in metals are plasmons They come in different flavours, such as surface or bulk plasmons
|
|
|