aaaa202 said:I am reading about angle-resovled-photoemission-spectroscopy (ARPES). It seems that it is a technique that gives the energy dispersion as a function of the momentum k. However in all talks about it, it seems to be a technique that gives us the fermi surface of the given structure. I don't understand this. Does it not give us the full band structure and not necessarily just the energy diagram for the highest occupied energy states?
Fermi surface spectroscopy is a technique used in condensed matter physics to study the electronic structure of materials. It involves measuring the energy levels of electrons near the Fermi energy, which is the highest occupied energy level at absolute zero temperature.
Fermi surface spectroscopy is typically performed using angle-resolved photoemission spectroscopy (ARPES), which involves shining a beam of light onto a material and measuring the energy and angle of the emitted electrons. Other techniques such as scanning tunneling microscopy (STM) and quantum oscillation measurements can also be used.
Fermi surface spectroscopy can provide valuable information about the electronic band structure of a material, including the location and shape of the Fermi surface, the energy and momentum distribution of electrons, and the presence of any energy gaps or Fermi surface instabilities.
Fermi surface spectroscopy is used in a wide range of applications, including the study of superconductors, topological insulators, and other exotic materials. It is also used to investigate the effects of impurities, defects, and other perturbations on the electronic properties of materials.
One limitation of Fermi surface spectroscopy is that it requires samples of high quality and purity in order to obtain accurate results. Additionally, the interpretation of data from Fermi surface spectroscopy can be complex and may require sophisticated theoretical models to fully understand the electronic properties of a material.