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

Olbrich, P. ; Zoth, C. ; Vierling, P. ; Dantscher, K.-M. ; Budkin, G.V. ; Tarasenko, Sergey ; Belkov, V.V. ; Kozlov, D.A. ; Kvon, Z.D. ; Mikhailov, N.N. ; Dvoretsky, S.A. ; Ganichev, Sergey

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Abstract

We report on the observation of the giant spin-polarized photocurrent in HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum emerges. Exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (-0.4 T) to positive (up to 1.2 T) magnetic ...

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