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Publication Summaries

Accepted for Publication:

1. Bernard Yurke, Richard Elliot, Aaron Sup, “A ballistic Frenkel-exciton gate with a high on-off ratio,” accepted for publication in Physical Review A, July 3, 2024.

Comment: A quantum gate is described in which the flow of excitons along an exciton transmission line is controlled by the state of excitation of a single gate molecule. When the gate molecule is unexcited, excitons flow through the gate region unimpeded. When the gate molecule is excited, exciton flow through the gate channel region is inhibited. If the gate molecule is in a superposition of the unexcited and excited state, the gate system and transmission line system have become entangled. A high on-off ratio is achieved by employing a switchable Bragg grating that arises from the difference static dipole, Δd, interactions between the gate molecule and the gate channel molecules. A gate consisting of one gate molecule and five gate channel molecules could fit in a 1 nm^3 volume and achieve an on off-ratio greater than 10^2.

2. Jonathan S. Huff, Lance K. Patten, Daniel B. Turner, William B. Knowlton, Jeunghoon Lee, Bernard Yurke, and Ryan D. Pensack, Assembled Structural Insight into a Sixteen Cyanine Dye Construct via Exciton-Exciton Annihilation, accepted for publication in Journal of Physical Chemistry Letters, July 26, 2024.

Comment: In this study, we used DNA oligonucleotides featuring 4 Cy5 dyes linked in series along the phosphate backbone to assemble many-dye constructs that incorporate 4, 8, or 16 Cy5 dyes. Using a combination of steady-state and time-resolved spectroscopic techniques, we determined that the 4, 8, and 16 Cy5 constructs consist of 1, 2, or 4 strongly-coupled tetramer clusters, respectively, and that weak interactions between tetramers facilitate energy transfer at low excitation intensities and exciton-exciton annihilation at high excitation intensities. The large absorption cross sections and energy transfer we observe for these many-dye constructs may be useful for optical antenna applications.

 

3. Maia N. Ketteridge, Devan R. Watt, Katelyn M. Duncan, German Barcenas, Kaden Shaw, William B. Knowlton, Bernard Yurke, Ryan D. Pensack, Olga A. Mass, and Lan Li, Influence of substituents on the vectorial difference static dipole upon excitation in synthetic bacteriochlorins, accepted for publication in Journal of Physical Chemistry A, August 21, 2024.

Comment: Utilizing density functional theory (DFT), relationships between substitution pattern and key properties (Δd, μ, and the angle between Δd and μ (ζ)) were identified for bacteriochlorins. A subset of bacteriochlorins were synthesized, and the relative trend in Δd agreed with DFT results. These results provide a basic framework for the design of bacteriochlorins for QIS systems.