Small scale lateral superlattices in two-dimensional electron gases prepared by diblock copolymer masks

TL;DR

This paper demonstrates the fabrication of a small-scale lateral superlattice in a two-dimensional electron gas using a diblock copolymer mask, revealing electron guiding effects through transport measurements.

Contribution

It introduces a novel method for creating periodic superlattices in 2DEGs using diblock copolymer masks, achieving a 43 nm period.

Findings

Positive magnetoresistance observed near zero magnetic field

Electron motion influenced by the superlattice potential

Successful patterning of a 43 nm period superlattice

Abstract

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.