Polarized-microwave control of directed transport in a 2D electron gas with artificial asymmetrical scatterers

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• 作者：S. Sassine ; Yu. Krupko ; Z.D. Kvon ; J.-C. Portal ; R. Murali ; K.P. Martin ; G. Hill ; A.D. Wieck
• 关键词：Electronic transport ; Quantum ratchets ; Photogalvanic effects ; Nanodevices
• 刊名：Physica E
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：40
• 期：6
• 页码：2043-2045
• 全文大小：199 K

文摘

The directed electron transport, driven by external linear-polarized microwave irradiation, in a two-dimensional spatially periodic asymmetrical system called “ratchet” has been studied experimentally. The broken spatial symmetry was introduced in a high mobility two-dimensional electron gas based on AlGaAs/GaAs heterojunction by patterning an array of artificial semidiscs-shaped scatterers (antidots). A directed electric current of few ration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6VMT-4PRYG95-9&_mathId=mml1&_user=1067359&_cdi=6159&_rdoc=88&_acct=C000050221&_version=1&_userid=10&md5=b98c91707f62b4da23f7197a61f2fc6d"" title=""Click to view the MathML source"" alt=""Click to view the MathML source"">μA was observed in the “ratchet” antidot lattice under microwave irradiation (of few ration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6VMT-4PRYG95-9&_mathId=mml2&_user=1067359&_cdi=6159&_rdoc=88&_acct=C000050221&_version=1&_userid=10&md5=7546e845f2b3b2b92a2f5cac54c497fb"" title=""Click to view the MathML source"" alt=""Click to view the MathML source"">μW) in the absence of any external current applied to the sample. The signal was recorded as a function of magnetic field, temperature, microwave power and polarization.