Anomalous giant piezoresistance in AlAs 2D electron systems with antidot lattices

O. Gunawan, T. Gokmen, Y. P. Shkolnikov, E. P. De Poortere, M. Shayegan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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.

Original languageEnglish (US)
Article number036602
JournalPhysical review letters
Issue number3
StatePublished - Jan 24 2008

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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