Colossal magnetoresistance in an ultra-clean weakly interacting 2D Fermi liquid

B.A. Piot; G. Gervais; K.W. West; L.N. Pfeiffer; L.W. Engel; M. Bonin; S. Das Sarma; Xiaoqing Zhou

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Colossal magnetoresistance in an ultra-clean weakly interacting 2D Fermi liquid

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arxiv 1003.5920 v1 pith:MPPEVJS2 submitted 2010-03-30 cond-mat.str-el cond-mat.mes-hall

Xiaoqing Zhou , B.A. Piot , M. Bonin , L.W. Engel , S. Das Sarma , G. Gervais , L.N. Pfeiffer , K.W. West This is my paper

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keywords magnetoresistancecolossalfieldmagneticelectronobservationstrongsystem

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We report the observation of a new phenomenon of colossal magnetoresistance in a 40 nm wide GaAs quantum well in the presence of an external magnetic field applied parallel to the high-mobility 2D electron layer. In a strong magnetic field, the magnetoresistance is observed to increase by a factor of ~300 from 0 to 45T without the system undergoing any metal-insulator transition. We discuss how this colossal magnetoresistance effect cannot be attributed to the spin degree-of-freedom or localization physics, but most likely emanates from strong magneto-orbital coupling between the two-dimensional electron gas and the magnetic field. Our observation is consistent with a field-induced 2D-to-3D transition in the confined electronic system.

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