Phys. Rev. Lett. 100, 036602 (2008) [4 pages]Anomalous Giant Piezoresistance in AlAs 2D Electron Systems with Antidot LatticesReceived 2 July 2007; revised 4 October 2007; published 24 January 2008 An AlAs two-dimensional electron system patterned with an antidot lattice exhibits a giant piezoresistance effect at low temperatures, with a sign opposite to the piezoresistance observed in the unpatterned region. We suggest that the origin of this anomalous giant piezoresistance is the nonuniform strain in the antidot lattice and the exclusion of electrons occupying the two conduction-band valleys from different regions of the sample. This is analogous to the well-known giant magnetoresistance effect, with valley playing the role of spin and strain the role of magnetic field. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.036602
DOI:
10.1103/PhysRevLett.100.036602
PACS:
72.20.Fr, 73.23.Ad, 73.63.Hs, 75.47.Jn
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