Scientists at MIT have found a way to visualize electron behavior beneath a material’s surface. The team’s technique is based on quantum mechanical tunneling, a process by which electrons can traverse energetic barriers by simply appearing on the other side. In this image, researchers show the measured tunneling spectra at various densities, with high measurements in red.
For the first time, physicists have developed a technique that can peer deep beneath the surface of a material to identify the energies and momenta of electrons there. The energy and momentum of these electrons, known as a material's "band structure," are key properties that describe how electrons move through a material. Ultimately, the band structure determines a material's electrical and optical properties. The team, at MIT and Princeton University, has used the technique to probe a semiconducting sheet of gallium arsenide, and has mapped out the energy and momentum of electrons throughout the material. The results are published today in the journal Science . By visualizing the band structure, not just at the surface but throughout a material, scientists may be able to identify better, faster semiconductor materials. They may also be able to observe the strange electron interactions that can give rise to superconductivity within certain exotic materials.
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