Planar array of semiconducting nanotubes in external electric field: Collective screening and polarizability

Details Planar array of semiconducting nanotubes in external electric field: Collective screening and polarizability Planar array of semiconducting nanotubes in external electric field: Collective screening and polarizability

2006-07-11

arxiv.org/abs/cond-mat/0607295v2

Phys. Rev. B 74, 235423 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures, RevTex

Scientific paper

10.1103/PhysRevB.74.235423

We study theoretically the charge separation in a planar array of semiconducting nanotubes (NTs) of length, 2h, placed in external electric field, F, parallel to their axes. By employing the conformal mapping, we find analytically the exact distribution of the induced charge density for arbitrary ratio of the gap, E_g, and the voltage drop, eFh, across the NT. We use the result obtained to (i) trace the narrowing of the neutral strip at center of the NT with increasing F; (ii) analyze the polarizability of the array as a function of E_g; (iii) study the field enhancement near the tips.

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