Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires

Details Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires Nanoscale Effects on Heterojunction Electron Gases in GaN/AlGaN Core/Shell Nanowires

2011-06-23

arxiv.org/abs/1106.4833v2

Physics

Condensed Matter

Materials Science

16 pages, 7 figures. To appear in Nano Letters. Corrected some typos

Scientific paper

The electronic properties of heterojunction electron gases formed in GaN/AlGaN core/shell nanowires with hexagonal and triangular cross-sections are studied theoretically. We show that at nanoscale dimensions, the non-polar hexagonal system exhibits degenerate quasi-one-dimensional electron gases at the hexagon corners, which transition to a core-centered electron gas at lower doping. In contrast, polar triangular core/shell nanowires show either a non-degenerate electron gas on the polar face or a single quasi-one-dimensional electron gas at the corner opposite the polar face, depending on the termination of the polar face. More generally, our results indicate that electron gases in closed nanoscale systems are qualitatively different from their bulk counterparts.

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