Role of electronic structure in photoassisted transport through atomic-sized contacts

Details Role of electronic structure in photoassisted transport through atomic-sized contacts Role of electronic structure in photoassisted transport through atomic-sized contacts

2006-07-19

arxiv.org/abs/cond-mat/0607505v2

Phys. Rev. B 75, 075406 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 figures; four new figures added

Scientific paper

10.1103/PhysRevB.75.075406

We study theoretically quantum transport through laser-irradiated metallic atomic-sized contacts. The radiation field is treated classically, assuming its effect to be the generation of an ac voltage over the contact. We derive an expression for the dc current and compute the linear conductance in one-atom thick contacts as a function of the ac frequency, concentrating on the role played by electronic structure. In particular, we present results for three materials (Al, Pt, and Au) with very different electronic structures. It is shown that, depending on the frequency and the metal, the radiation can either enhance or diminish the conductance. This can be intuitively understood in terms of the energy dependence of the transmission of the contacts in the absence of radiation.

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