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

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

2010-03-30

arxiv.org/abs/1003.5920v1

Phys. Rev. Lett. 104, 216801 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.104.216801

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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