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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 The electron and the hole are attracted to each other, and form a pair, just like
quantum mechanics - What are dark excitons and how to find them . . . Is the dark exciton just an exciton that does not emit a photon? If so, why do some excitons emit light and other not (what are the conditions that decide what happens)? And also - how can we observe a dark exciton if it doesn't emit a photon that we could measure?
Whats the difference between an exciton and a geminate pair? A geminate pair can be considered as a charge-transfer exciton, i e , when an electron from the electron-hole (exciton) pair in some homogeneous material experiences a transfer through the interface between electron donor and electron acceptor materials The electron in the electron-accepting material and the hole in the electron-donor material remain bound by electrostatic interaction, so
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
Excitons in metals-do they exist? - Physics Stack Exchange Note, the more appropriate quasi-particle in metals are plasmons They come in different flavours, such as surface or bulk plasmons With respect to the energy loss, discussed in your first reference, the dipole-dipole coupling that is assumed is probably correct, just that the energy acceptor in a metal is a plasmon rather than an exciton