Harnessing quantum mechanics to move energy more efficiently may enable new types of materials for detector technologies, solar light harvesting, and sensors. We use small artificial systems to test ideas for engineering quantum dynamics in chemical systems. We also explore quantum dots and other semiconductor systems to translate our ideas from molecules toward bulk materials. This work has also pointed us toward the complex interplay of ligands and surface states and the quantum confined core states. Our 2D spectroscopy has proven to be a useful probe of the dynamics driven to coupling to these dark states.
We are also interested in using coherent dynamics in materials to process quantum information. Transcribing quantum information using excited state dynamics rather than quantum optics will allow new technologies for secure communication, quantum key exchange, and spectroscopy.
L. Wang, N.E. Williams, E.W. Malachosky, J.P. Otto, D. Hayes, R.E. Wood, P. Guyot-Sionnest, and G.S. Engel, "Scalable Ligand-Mediated Transport Synthesis of Organic-Inorganic Hybrid Perovskite Nanocrystals with Resolved Electronic Structure and Ultrafast Dynamics" ACS Nano 11, 2689–2696 2017.
C. She, I. Fedin, D.S. Dolzhnikov, P.D. Dahlberg, G.S. Engel, R.D. Schaller, D.V. Talapin, "Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets" ACS Nano. 9, 9475–9485 2015.
Y. Zhang, S. Oh, F.H. Alharbi, G.S. Engel, and S. Kais, "Delocalized quantum states enhance photocell efficiency" Phys. Chem. Chem. Phys. 17, 5743-5750 2015.
J.R. Caram, H. Zheng, P.D. Dahlberg, B.S. Rolczynski, G.B. Griffin, D.S. Dolzhnikov, D.V. Talapin, and G.S. Engel, "Exploring size and state dynamics in CdSe quantum dots using two-dimensional electronic spectroscopy" J. Chem. Phys. 140, 084701 2014.
G.B. Griffin, P.M. Lundin, B.S. Rolczynski, A. Linkin, R.D. McGillicuddy, Z.Bao, and G.S. Engel, "Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer" J. Chem. Phys. 140, 034903 2014.