Photogalvanic Effects in Heteropolar Nanotubes

Details Photogalvanic Effects in Heteropolar Nanotubes Photogalvanic Effects in Heteropolar Nanotubes

2000-04-07

arxiv.org/abs/cond-mat/0004116v1

Physics

Condensed Matter

Materials Science

4 pages in RevTeX cotaining 2 epsf color figures

Scientific paper

10.1103/PhysRevLett.85.1512

We show that an electrical shift current is generated when electrons are photoexcited from the valence to conduction bands on a BN nanotube. This photocurrent follows the light pulse envelope and its symmetry is controlled by the atomic structure of the nanotube. We find that the shift current has an intrinsic quantum mechanical signature in which the chiral index of the tube determines the direction of the current along the tube axis. We identify discrete lattice effects in the tangent plane of the tube that lead to an azimuthal component of the shift current. The nanotube shift current can lead to ultrafast opto-electronic and opto-mechanical applications.

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