Date:
Thu, 10/03/2022 - 11:00 to 12:00
Location:
Los Angeles Bld., Jerusalem, Israel
This Thursday, 10.03 at 11.00 am we will have a FH seminar where Prof. Jianshu Cao from the Massachusetts Institute of Technology (USA) will give a lecture titled "Quantum Transport in Organic Semiconductors". See the details in the file attached.
In the first part of the talk, I will present calculations of coherent charge and exciton
transport in disordered organic systems, which reveal an optimal diffusion constant at the
crossover between the coherent and incoherent regimes.[1] The quantum enhancement in the
coherent regime depends on the dimension and shape of the sample and exhibits a universal
scaling.[2] Mapping of quantum to kinetic networks provide both an intuitive understanding
of these coherent features and a potentially useful numerical technique. Though transport is
suppressed by disorder, trapping or dissociation can be enhanced by disorder.[3]
In the second part of the talk, I will discuss recent results on quantum diffusion assisted by
phonons or cavity photons. Our analysis of the tilted Holstein model predicts the fractional
vibronic resonance, which is supported by mapping the Holstein model to a continuous time
random walk.[4] In optical cavities, disordered organic molecules are coupled to cavity fields
collectively, such that the cooperativity in the light-matter interaction can overcome the
Anderson disorder and lead to a turnover in transport at an optimal level of static disorder.[5]
1. Coherent quantum transport in disordered systems: I. The influence of dephasing on the
transport properties and absorption spectra on one-dimensional systems. Moix, Khasin,
Cao, New Journal of Physics, 15, 085010 (2013)
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. Long-range non-equilibrium coherent tunneling induced by fractional vibronic resonances.
Kessing, Yang, Manmana, Cao, arXiv:2111.06137 (2021)
5. Unusual dynamical properties of disordered polaritons in microcavities. Engelhardt, J Cao.
arXiv:2112.04060 (2021)
In the first part of the talk, I will present calculations of coherent charge and exciton
transport in disordered organic systems, which reveal an optimal diffusion constant at the
crossover between the coherent and incoherent regimes.[1] The quantum enhancement in the
coherent regime depends on the dimension and shape of the sample and exhibits a universal
scaling.[2] Mapping of quantum to kinetic networks provide both an intuitive understanding
of these coherent features and a potentially useful numerical technique. Though transport is
suppressed by disorder, trapping or dissociation can be enhanced by disorder.[3]
In the second part of the talk, I will discuss recent results on quantum diffusion assisted by
phonons or cavity photons. Our analysis of the tilted Holstein model predicts the fractional
vibronic resonance, which is supported by mapping the Holstein model to a continuous time
random walk.[4] In optical cavities, disordered organic molecules are coupled to cavity fields
collectively, such that the cooperativity in the light-matter interaction can overcome the
Anderson disorder and lead to a turnover in transport at an optimal level of static disorder.[5]
1. Coherent quantum transport in disordered systems: I. The influence of dephasing on the
transport properties and absorption spectra on one-dimensional systems. Moix, Khasin,
Cao, New Journal of Physics, 15, 085010 (2013)
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. Long-range non-equilibrium coherent tunneling induced by fractional vibronic resonances.
Kessing, Yang, Manmana, Cao, arXiv:2111.06137 (2021)
5. Unusual dynamical properties of disordered polaritons in microcavities. Engelhardt, J Cao.
arXiv:2112.04060 (2021)