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Tailoring the core electron density in modulation-doped core−multi-shell nanowires

AuthorsBuscemi, Fabrizio; Royo Valls, Miquel ; Goldoni, Guido; Bertoni, Andrea
KeywordsCore-shell nanowires
Modulation doping
Tubular 2DEG
Electrostatic screening
Issue Date4-Apr-2016
PublisherInstitute of Physics Publishing
CitationNanotechnology 27(19): 195201 (2016)
AbstractWe show how a proper radial modulation of the composition of core-multi-shell nanowires (NWs) critically enhances the control of the free-carrier density in the high-mobility core with respect to core−single-shell structures, thus overcoming the technological difficulty of fine tuning the remote doping density. We calculate the electron population of the different NW layers as a function of the doping density and of several geometrical parameters by means of a self-consistent Schrödinger–Poisson approach: free carriers tend to localize in the outer shell and screen the core from the electric field of the dopants.
Publisher version (URL)http://dx.doi.org/10.1088/0957-4484/27/19/195201
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