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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Zusammenfassung
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 ...
Zusammenfassung
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 photo curent 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 heate
d by the radiation.
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