Harald Schneider, Jacob C. König-Otto, Alexej Pashkin, Yongrui Wang, Alexey Belyanin, Manfred Helm, Stephan Winnerl
http://ieeexplore.ieee.org/document/8066873/
Using degenerate four-wave mixing (DFWM), we have investigated the coherent polarization between the lowest Landau levels in graphene under resonant excitation with narrowband THz pulses. A pronounced DFWM signal is observed and its dependence on THz field strength and magnetic field detuning is explored and compared with theoretical expectations.
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