1203.1485 (Christoph Kreisbeck et al.)

Long-Lived Electronic Coherence in Dissipative Exciton-Dynamics of
Light-Harvesting Complexes    [PDF]

Christoph Kreisbeck, Tobias Kramer

The observed prevalence of oscillatory signals in the spectroscopy of biological light-harvesting complexes at ambient temperatures has led to a search for mechanisms supporting coherent transport through larger molecules in noisy environments. We demonstrate a generic mechanism supporting long-lasting electronic coherence up to 0.3 ps at a temperature of 277 K. The mechanism relies on two properties of the spectral density: (i) a large dissipative coupling to higher vibronic modes required for efficient transport and (ii) a slow onset of the spectral density for small frequencies.

View original: http://arxiv.org/abs/1203.1485