Presentation-Probing and controlling spin transport with ultrashort terahertz pulses

http://www.nccr-must.ch/seminars/upcoming_53.html?684

Date	Mo, 17.02.2020
Time	16:45h
Speaker	Prof. Tobias Kampfrath, Freie Universität Berlin and Fritz Haber Institute of the Max Planck Society
Location	ETH Hönggerberg, HPF G6
Program	To take advantage of the electron spin in future electronics, spin angular momentum needs to be transported and detected. Heat gradients and electric fields have been shown to efficiently drive spin transport at megahertz and gigahertz frequencies. However, to probe the initial elementary steps thatlead to the formation of spin currents, we need to launch and measure transport on femtosecond time scales. This goal is achieved by employing both ultrashort optical and terahertz electromagnetic pulses. We show that this experimental strategy provides new insights into important spintronic effects, in particular the spin Seebeck effect and even mature phenomena such as anisotropic magnetoresistance.Interesting applications such as the efficient generation of ultrashort terahertz electromagnetic pulses will also be addressed.