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Research Zernike (ZIAM) News Seminars

Jianshu Cao: Exciton Dynamics and Spectra of organic Semiconductors

When:Th 10-10-2019 11:00 - 12:00

(I) Calculations of coherent quantum transport in disordered organic systems reveal an optimal diffusion constant at an intermediate level of noise and temperature and predict charge mobility close to experimental values. [1] Further, we have explored the dependence on the dimensionality and shape and demonstrated the universal scaling of the 1D-2D transition in the diffusion of nanotubes [2]. Though transport is suppressed by disorder, trapping or dissociation can be enhanced by disorder. [3]

(II) Spectroscopic measurements of nanotubes and 2D systems allow us to classify the structure of dipolar lattices beyond the simple rule of H and J aggregates. [4] Further, we have studied the scaling laws in the spectral shift, splitting, and width, and related them to the structure of molecular aggregates. [4,5]

(1) "Coherent quantum transport in disordered systems (III): A unified polaron treatment of hopping and band-like transport" Lee, Moix, Cao, JCP 142, 164103 (2015)

(2) "Quantum diffusion on molecular tubes: Universal scaling of the 1D to 2D transition". Chuang, Lee, Moix, Knoester, and Cao, Phys. Rev. Lett. 116, 196803 (2016)

(3) "Generic mechanism of optimal energy transfer efficiency: A scaling theory of the mean first-passage time in exciton systems" Wu, Silbey, Cao, Phys. Rev. Lett 110 (20), 200402 (2013)

(4) "Generalized Kasha's Scheme for Classifying Two-Dimensional Excitonic Molecular Aggregates: Temperature Dependent Absorption Peak Frequency Shift" Chuang, Bennett, Caram, Aspuru-Guzik, Bawendi, J Cao, accepted by CHEM. (2019)

(5) "Construction of multichromophoric spectra from monomer data: Applications to resonant energy transfer". Chenu and Cao, Phys. Rev. Lett. 118, 013001 (2017)