A poly(styrene-block-methylmethacrylate) diblock copolymer in the hexagonal cylindrical phase has been used as a mask for preparing a periodic gate on top of a Ga[Al]As-heterostructure. A superlattice period of 43 nm could be imposed onto the two-dimensional electron gas. Transport measurements show a characteristic positive magnetoresistance around zero magnetic field which we interpret as a signature of electron motion guided by the superlattice potential.
@article{arxiv.0806.3896,
title = {Small scale lateral superlattices in two-dimensional electron gases prepared by diblock copolymer masks},
author = {S. Hugger and T. Heinzel and T. Thurn-Albrecht},
journal= {arXiv preprint arXiv:0806.3896},
year = {2009}
}