Electric field induced narrowing of exciton line width

Details Electric field induced narrowing of exciton line width Electric field induced narrowing of exciton line width

2004-08-12

arxiv.org/abs/cond-mat/0408296v2

Phys. Rev. B 72, 115304 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

RevTeX4, 4 pages, 1 figure; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.72.115304

Considering effects of electric field on the low temperature absorption line of quantum well excitons, we show that, for moderate strength of the electric field, the main contribution to the field dependence of the line-width results from field induced modifications of inhomogeneous broadening of excitons. We find that the strength of the random potential acting on quantum well excitons due to alloy disorder and interface roughness can either decrease or increase with field depending upon the thickness of the well. This means that under certain conditions one can observe counterintuitive narrowing of exciton spectral lines in electric field.

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