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The wave-particle duality of quantum particles is well known, but measuring the wavefunction of a quantum object can prove to be quite difficult. Electrons in crystal lattices are known to have a wave function that can be simplified down to a series of plane waves that are acted on with a periodic potential. This theory was proposed by Felix Bloch back in the 1920s, and while the theory has allowed us to calculate many qualities of electrons in crystals, measuring the wave function directly has proven to be very difficult. In this recent paper [1] from a research team in UC Santa Barbara, the Bloch wavefunction has been measured. They did this by blasting a crystal with a strong terahertz laser while making electron-hole pairs. By measuring the polarisation of the light emitted when the electron-hole pair eventually annihilates, these researchers were able to ascertain information about the phase of the wave function. This is a great proof of principle experiment and promises to be able to probe the wavefunctions of much more complex crystals in the future. Paper: [1] Costello, J.B., O’Hara, S.D., Wu, Q. et al. Reconstruction of Bloch wavefunctions of holes in a semiconductor. Nature 599, 57–61 (2021). https://doi.org/10.1038/s41586-021-03... Popular science articles: https://physicsworld.com/a/electrons-... https://phys.org/news/2021-11-scienti... https://scitechdaily.com/first-experi... 0:00 - Intro 0:46 - Bloch Wave function 2:14 - Measuring the wavefunction 4:12 - Outlook #QuantumMechanics #physics #CondenseMatterPhysics #Science