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martinphy
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I have a question on intervalley excitation in semiconductors. How can we make it happen? With photon at high electric field? I suppose it will need a change of momentum and energy at the same time. Thanks so much.
Intervalley excitation refers to the process by which an electron in a semiconductor material gains energy and moves from one energy valley (or band) to another. This typically occurs when the electron absorbs a photon of light or is subjected to an electric field.
Intervalley excitation plays a crucial role in the operation of semiconductor devices. It allows for the creation and control of charge carriers, which are necessary for the flow of current in electronic devices. It also enables the creation of light-emitting diodes and lasers, which are important components in modern technology.
When an electron undergoes intervalley excitation, it transitions from one energy state to another. This can have a significant impact on the electronic and optical properties of the semiconductor, such as its conductivity, bandgap, and light absorption and emission capabilities.
The rate of intervalley excitation in a semiconductor depends on several factors, including the energy and intensity of the incident light, the material properties of the semiconductor, and the presence of impurities or defects in the material. The band structure and crystal structure of the semiconductor also play a role in determining the efficiency of intervalley excitation.
Intervalley excitation can be investigated using various experimental techniques, such as optical spectroscopy, electrical measurements, and theoretical modeling. These methods allow for the characterization of the electronic and optical properties of semiconductors and the identification of intervalley excitation processes. Additionally, advanced imaging techniques, such as scanning tunneling microscopy, can provide valuable insights into the behavior of individual electrons during intervalley excitation.