Self-assembled guanine ribbons as wide-bandgap semiconductors

Details Self-assembled guanine ribbons as wide-bandgap semiconductors Self-assembled guanine ribbons as wide-bandgap semiconductors

2001-10-30

arxiv.org/abs/cond-mat/0110634v1

Physica E vol.13/2-4, 1236 (2002)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 3 figures, to be published in Physica E

Scientific paper

We present a first principle study about the stability and the electronic properties of a new biomolecular solid-state material, obtained by the self-assembling of guanine (G) molecules. We consider hydrogen-bonded planar ribbons in isolated and stacked configurations. These aggregates present electronic properties similar to inorganic wide-bandgap semiconductors. The formation of Bloch-type orbitals is observed along the stacking direction, while it is negligible in the ribbon plane. Global band-like conduction may be affected by a dipole-field which spontaneously arises along the ribbon axis. Our results indicate that G-ribbon assemblies are promising materials for biomolecular nanodevices, consistently with recent experimental results.

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