Friday, July 12, 2013

1307.2913 (A. A. Kocherzhenko et al.)

Collective Effects in Linear Spectroscopy of Molecular Aggregates    [PDF]

A. A. Kocherzhenko, J. Dawlaty, B. P. Abolins, F. Herrera, D. B. Abraham, K. B. Whaley
A consistent analysis of linear spectroscopy for arrays of dipole-coupled two-level molecules reveals distinct signatures of weak and strong coupling regimes separated by a critical point. Multiple molecular excitations (odd(even) in weak(strong) coupling) are accessed from the ground state. As the coupling increases, the single excitation oscillator strength rapidly exceeds the Heitler-London value and diverges at the critical point, returning to a quadratic size scaling in strong coupling, where also the photon frequency decreases with size. The lowest accessible excitation is found to show a one-photon hyperradiance.
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