New picosecond laser technique to shed light on conductivity

New insights into superconductivity could be gleaned from the technique, discussed by physicists from the Stewart Blusson Quantum Matter Institute (SBQMI) at the University of British Columbia and their colleagues in Science. The researchers have developed a new extreme-ultraviolet laser source to enable a technique called time-resolved photoemission spectroscopy, which visualises how electrons are scattered from atoms in solid materials at ultrafast timescales.

______________________________________________________________________

______________________________________________________________________

"Using an ultrashort laser pulse, we excited individual electrons away from their usual equilibrium environment," said MengXing Na, a PhD student at SBQMI and co-lead author of the Science paper. "Using a second laser pulse as an effective camera shutter, we captured how the electrons scatter with surrounding atoms on timescales faster than a trillionth of a second. Owing to the very high sensitivity of our setup, we were able to measure directly—for the first time—how the excited electrons interacted with a specific atomic vibration, or phonon."