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Giant spin-polarized current in a Dirac fermion system at cyclotron resonance by Olbrich, P.; Zoth, C.; Vierling, P.; Dantscher, K. -M.; Budkin, G. V.; Tarasenko, S. A.; Bel'kov, V. V.; Kozlov, D. A.; Kvon, Z. D.; Mikhailov, N. N.; Dvoretsky, S. A.; Ganichev, S. D. is a scholarly article available to read on EtoBox.

What is Giant spin-polarized current in a Dirac fermion system at cyclotron resonance about?

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 fields by means of optical gating. The photocurent data, accompanied by measurements of radiation transmission as well as Shubnikov-de Haas and quantum Hall effects, give an evidence that the enhancement of the photocurrent is caused by cyclotron resonance in a Dirac fermion system. The developed theory shows that the current is spin polarized and originates from the spin dependent scattering of charge carriers heated by the radiation.

Author

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

Published

2013

Language

EN