Fermi level pinning can determine polarity in semiconductor nanorods

Details Fermi level pinning can determine polarity in semiconductor nanorods Fermi level pinning can determine polarity in semiconductor nanorods

2011-10-30

arxiv.org/abs/1110.6656v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 8 figures. Accepted for publication in Phys. Rev. B

Scientific paper

First-principles calculations of polar semiconductor nanorods reveal that their dipole moments are strongly influenced by Fermi level pinning. The Fermi level for an isolated nanorod is found to coincide with a significant density of electronic surface states at the end surfaces, which are either mid-gap states or band-edge states. These states pin the Fermi level, and therefore fix the potential difference across the rod. We provide evidence that this effect can have a determining influence on the polarity of nanorods, and has consequences for the way a rod responds to changes in its surface chemistry, the scaling of its dipole moment with its size, and the dependence of polarity on its composition.

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