Coherent Dynamics

heterodimer molecular structure that demonstrates quantum coherence

Coherent Dynamics

Quantum dynamics of molecular systems involves not only the simple coherent evolution of the system, but also how the molecules couple to their surroundings. Simple approximations such as Förster theory capture dynamics of molecules in solvent quite well. However, as electronic coupling gets stronger and the coupling to the bath becomes weaker, this approach breaks down. While theoretical methods such as Redfield theory can operate in this regime, a structured, shared bath can lead to vibronic coupling, coherent transport and other exciting new dynamical effects. We create spectroscopies, theoretical frameworks, and molecular systems to test these ideas. We translate these notions into new materials and new strategies for harnessing excited state dynamics for quantum communication, information processing, and light harvesting.

B.S. Rolczynski, H. Zheng, V.P. Singh, P. Navotnaya, A.R. Ginzburg, J.R. Caram, K. Ashraf, A.T. Gardiner, S.-H. Yeh, S. Kais, R.J. Cogdell, and G.S. Engel, "Correlated Protein Environments Drive Quantum Coherence Lifetimes in Photosynthetic Pigment-Protein Complexes" Chem 4, 138–149 2018.

***Highlighted with a preview written by Dr. Margherita Maiuri and Prof. Greg Scholes.***

Y. Zhang, A. Wirthwein, F.H. Alharbi, G.S. Engel, and S. Kais., "Dark states enhance the photocell power via phononic dissipation", Phys. Chem. Chem. Phys. 18, 31845-31849 2016.