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Electric-field stabilization in a high-density surface superlattice
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic drawing of the sample structure. In (b), the theoretically calculated bandstructures along the surface SL are plotted for , , and CEW widths, together with a simple cosine fit. (c) The 2D SSL generally shows long relaxation times. Comparing the parameter for our samples with the extensive work in Ref. 14, we can find the appropriate transport description for each sample.

Image of FIG. 2.
FIG. 2.

(a) Current-voltage characteristics of the undoped SLs acting as shunts (grey symbols) and of the combined system of shunt and SSL (black symbols). The undoped SLs show no instabilities and no NDC as expected from their products. The inset shows the current-voltage characteristics of the SL structure for zero-applied gate bias and after removing the gate mechanically. Panel (b) shows the current-voltage contribution of the SSLs. Both for the SL and the SL structures, the transport behavior is in good agreement with a fit based on a simple semiclassical model (grey lines). In panel (c), current-voltage characteristics of samples with identical parameters are shown. For these samples, the shunt carries no current.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electric-field stabilization in a high-density surface superlattice