Optical injection of charge current in quantum wires: oscillations induced by excitonic effects

We investigate the charge current that is optically injected by interference between one- and two-photon excitation in the presence of excitonic effects. We consider a realistic V-shaped quantum wire excited slightly below the band gap by two simultaneous femtosecond laser pulses of frequency 2 and that interact, respectively, with the lowest B1 and A1 excitons. Using effective multiband Bloch equations for two-photon transitions, including the Coulomb interaction within the Hartree-Fock approximation, we show that, because of the different symmetry properties of the involved excitons, the generated charge current displays oscillations due to the quantum interference between the excitonic coherences.


Published in:
Phys. Rev. B, 72, 7, 075357
Year:
2005
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 Record created 2007-09-26, last modified 2018-03-17

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