By using state-of-the-art THz spectroscopy, scientists from Freie Universität Berlin together with national and international partners clarified ultrafast and long-range flow of orbitally polarized electron for the first time. TheSurprisingly, the results show that the information stored in the orbital degrees of freedom prevails for periods about 100 times longer than the information stored in the electron's second angular-momentum channel—the spin degree of freedom.
In their work, the researchers used femtosecond laser pulses to excite ultrafast orbital angular momentum currents in Ni|W thin-film stacks and measured the emitted terahertz electromagnetic pulses.
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