Details of Grant 

EPSRC Reference:	GR/L16040/01
Title:	SHORT PERIOD LATERAL SUPERLATTICES
Principal Investigator:	Long, Professor AR
Other Investigators:	Williamson, Dr J Davies, Professor JH Willaimson, Dr J
Researcher Co-Investigators:
Project Partners:
Department:	School of Physics and Astronomy
Organisation:	University of Glasgow
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 1996	Ends:	31 January 2000	Value (£):	316,977
EPSRC Research Topic Classifications:	Materials Characterisation
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Summary on Grant Application Form
This proposal unites several skills unique o Glasgow: the growth of shallow 2DEGs of high quality; ultra-fine electron-beam lithography supported by selective dry etching; and theoretical understanding of the modulation of a 2DEG - the effect of strain in particular. We wish to exploit these accomplishments to investigate lateral surface superlattices (LSSLs) with a very short period and strong modulation. Our first devices will be 1D LSSLs whose modulation can be measured using commensurability oscillations. By reducing both the period of the superlattices and the density of the 2DEG we aim to restrict the electrons to the first Brillouin zone and detect this in the resistance. In principle there should also be a signature in magnetoresistance but this may be obscured by magnetic breakdown. We will also investigate the behaviour in high electric fields and at high frequency. We will then apply our expertise to 2-D LSSLs and search for the Hofstadter butterfly, a self-similar structure predicted in the density of states as a function of magnetic field. We believe that the largest modulation will be achieved through piezoelectric coupling of strain to the 2DEG. Special pseudomorphic layers will be grown for this. Their design will be driven by the development of a quantitative theory of the elastic and electrostatic fields and the effect on transport.
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Organisation Website:	http://www.gla.ac.uk