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We report on the observation of the giant spin-polarized photocurrent inHgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrumemerges. Exciting QW of 6.6 nm width by terahertz (THz) radiation and sweepingmagnetic field we detected a resonant photocurrent. Remarkably, the position ofthe resonance can be tuned from negative (-0.4 T) to positive (up to 1.2 T)magnetic fields by means of optical gating. The photocurent data, accompaniedby measurements of radiation transmission as well as Shubnikov-de Haas andquantum Hall effects, give an evidence that the enhancement of the photocurrentis caused by cyclotron resonance in a Dirac fermion system. The developedtheory shows that the current is spin polarized and originates from the spindependent scattering of charge carriers heated by the radiation.

Giant spin-polarized current in a Dirac fermion system at cyclotron resonance