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Circular photogalvanic effect in HgTe/CdHgTe quantum well structures

Wittmann, Bernhard ; Danilov, Sergey ; Belkov, Vassilij ; Tarasenko, Sergey ; Novik, E. G. ; Buhmann, Hartmut ; Bruene, C. ; Molenkamp, L. W. ; Ivchenko, Eougenious ; Kvon, Z. D. ; Mikhailov, N. N. ; Dvoretsky, S. A. ; Vinh, N. Q. ; van der Meer, A. F. G. ; Murdin, B. ; Ganichev, Sergey


We describe the observation of the circular and linear photogalvanic effects in HgTe/CdHgTe quantum wells. The interband absorption of mid-infrared radiation as well as the intrasubband absorption of terahertz radiation in the quantun well structures is shown to cause a dc electric current due to these effects. The photocurrent magnitude and direction varies with the radiation polarization state ...


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