Commensurability effects in lateral surface-doped superlattices

Deutschmann, R. A.; Stocken, C.; Wegscheider, W.; Bichler, M.; Abstreiter, G.
April 2001
Applied Physics Letters;4/9/2001, Vol. 78 Issue 15, p2175
Academic Journal
We fabricate density-modulated two-dimensional electron systems by shallow compensation doping the donor layer of a modulation-doped heterostructure. Zinc acceptor atoms are diffused from the sample surface which is heated by a focused laser beam. Low-temperature magnetotransport experiments provide evidence that high-quality lateral surface superlattices can be fabricated. In weak periodic one-dimensional potentials, commensurability oscillations are recovered, whereas in strong periodic two-dimensional potentials the semiclassically expected antidot resistance resonances are found to dominate the low-field transport. Additionally, the homogeneity of the laser-induced doping is confirmed by magnetic focusing experiments.


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