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Photogalvanic effects are observed and investigated in wurtzite(0001)-oriented GaN/AlGaN low-dimensional structures excited by terahertzradiation. The structures are shown to represent linear quantum ratchets.Experimental and theoretical analysis exhibits that the observed photocurrentsare related to the lack of an inversion center in the GaN-basedheterojunctions.

Quantum ratchet effects induced by terahertz radiation in GaN-based two-dimensional structures