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Liam Cleary, Ph.D.

Postdoctoral Associate
Department of Chemistry
Massachusetts Institute of Technology
E-mail: licleary@mit.edu
linkedin.com/in/licleary

Postal Address

Room 6-222A
Massachusetts Institute of Technology
77 Massachusetts Avenue
Cambridge, MA 02139





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Current Research

My current research concerns the transport phenomena of elementary excitations in quantum dissipative systems, in particular, the optimization of excitonic energy transfer processes in photosynthetic pigment-protein complexes, namely the light harvesting complexes of LH-II B850 and LH-I B875 found in purple bacteria.

Research Interesets

My research interesets include all of condensed matter physics, in particular transport in quantum and semiclassical dissipative systems. I enjoy being a member of the APS division of condensed matter physics (DCMP) and the topical group on statistical and nonlinear physics (GSNP).

Publications

  1. Optimal thermal bath for robust excitation energy transfer in disordered light-harvesting complex 2 of purple bacteria, L. Cleary and J. Cao,
    New J. Phys. 15 125030 (2013).
  2. Optimal fold symmetry of LH2 rings on a photosynthetic membrane, L. Cleary, H. Chen, C. Chuang, R. J. Silbey, and J. Cao,
    Proc. Natl. Acad. Sci. 110 (21) 8537 (2013).
  3. Master equation in phase space applied to the quantum Brownian motion in a tilted periodic potential, W. T. Coffey, Yu. P. Kalmykov, S. V. Titov, L. Cleary and W. J. Dowling,
    J. Phys. A: Math. Theor. 45, 105002 (2012).
  4. Phase space master equations for quantum Brownian motion in a periodic potential: comparison of various kinetic models, L. Cleary, W. T. Coffey, W. J. Dowling, Yu. P. Kalmykov and S. V. Titov,
    J. Phys. A: Math. Theor. 44, 475001 (2011).
  5. Semiclassical treatment of a Brownian ratchet using the quantum Smoluchowski equation, L. Cleary, W. T. Coffey, Yu. P. Kalmykov and S. V. Titov,
    Phys. Rev. E 80, 051106 (2009).
  6. Quantum effects in the Brownian motion of a particle in a double well potential in the overdamped limit, W. T. Coffey, Yu. P. Kalmykov, S. V. Titov and L. Cleary,
    J. Chem. Phys. 131, 084101 (2009).
  7. Nonlinear noninertial response of a quantum Brownian particle in a tilted periodic potential to a strong ac force as applied to a point Josephson junction,W. T. Coffey, Yu. P. Kalmykov, S. V. Titov and L. Cleary,
    Phys. Rev. B 79, 054507 (2009).
  8. Smoluchowski equation approach for quantum Brownian motion in a tilted periodic potential, W. T. Coffey, Yu. P. Kalmykov, S. V. Titov and L. Cleary,
    Phys. Rev. E 78, 031114 (2008).

PhD Thesis

  • A semiclassical approach to quantum Brownian motion in Wigner's phase space, L. Cleary, Dept. of Electronic and Electrical Engineering, Trinity College Dublin, October (2010).

Complete List

A list of publications and conferences can be found here

Latest

  1. Exploring the Photoluminescence Spectral Lineshapes of Single Nanocrystals in Solution Using Photon-correlation Fourier Spectroscopy, 2012 MRS Fall Meeting, Nov 25th-30th, Boston (Nov 28th, CC8.05).

Conference and workshop presentations:

  1. Intercomplex energy transfer rates and single molecule spectra of LH2 and LH1 as described by a polaron-transformed multichromophoric quantum master equation, ACS Spring 2012 Chemistry of Life Meeting, March 25th-29th, 2012, San Diego.
  2. Effect of the heat bath on the intercomplex resonance energy transfer rate as described by multichromophoric Foerster theory, Quantum Effects in Biological Systems, August 1st-5th, 2011, Ulm.
  3. Quantum Brownian motion in a periodic potential: comparison of various kinetic models, Theoretical, Computational, and Experimental Challenges to Exploring Coherent Quantum Dynamics in Complex Many-Body Systems, May 9th-12th, 2010, Dublin.
  4. Semiclassical treatment of a Brownian ratchet using the quantum Smoluchowski equation, DPG Spring Meeting of the Condensed Matter Section, March 21st-26th, 2010, Regensburg.
  5. Derivation of the quantum Smoluchowski equation using Brinkman's method, Tunneling and Scattering in Complex Systems - From Single to Many Particle Physics, International Workshop, Max-Planck Institut fuer Physik komplexer Systeme, September 14th-18th, 2009, Dresden.
  6. Smoluchowski equation approach for the quantum Brownian motion in a tilted periodic potential, ISSEC Irish Mechanics Society Joint Symposium, University College Dublin, May 16th, 2008.

Conference and workshop attendances:

  1. IOP Postgraduate Workshop on Spintronics, 13th November, 2009, University of York.
  2. DPG Spring Meeting of the Condensed Matter Section, March 22nd-27th, 2009, Dresden.
  3. Ireland Mathematica Seminar 2009, 21st October, 2009, Trinity College Dublin.

A Perfect Cognac Glass

The traditional measure of cognac is to place the glass on its side and fill to the brim. An equally popular measure is to place the glass vertically and fill to the point of maximum surface area. For a given glass curvature and stem length, by adjusting the base width we can create the perfect cognac glass, where the two measures are equal.

A Perfect Cognac Glass


Source Code: APerfectCognacGlass.nb

One-Sided Fourier Transform: Application to Linear Absorption and Emission Spectra

One sometimes needs to numerically evaluate the real part of the one-sided Fourier transform of a function f(t). A simple and efficient way to achieve this is to use a fundamental property of the two-sided Fourier transform of a conjugate-even function (i.e., f(-t) = f(t)* ) and use the efficient fast Fourier transform (FFT) algorithm. This procedure is applied here to the linear absorption and emission spectra of a single excitation interacting with a thermal environment.

One-Sided Fourier Transform Figure


Source Code: OneSidedFourierTrans...AndEmis-source.nb

Image Gallery

QuEBS_Ulm_2011_Fig1
IRGNUS_Singapore_2011_Fig1
TSICS_Dresden_2009_small