First Lecture and Discussion, Forum for Interdisciplinary Research and Studies (FIRST) by K. L. Sebastian, Lecture Hall, 1530 hrs


Indian Institute of Science Campus,

Bengaluru - 560 012


Forum for Interdisciplinary Research and Studies (FIRST)

Invites you to the First FIRST Lecture on


Coherences, Photosynthesis and Quantum Biology?


K. L. Sebastian

Department of Inorganic and Physical Chemistry

Indian Institute of Science


On Thursday, July 28, 2016, 3:30 PM in the Lecture Hall, NIAS


Abstract: It was believed that energy transfer within the photosystem involved exciton hoping from one site to the next. 2D electronic spectroscopic experiments carried out by Fleming et al. needed a modification of this view. The experiments suggested that at least in organisms living in extreme conditions, there is wave like energy transfer and that evolution has optimised the process using quantum coherence. Since then the energy flow has been studied a lot, both theoretically and experimentally. Also it has been suggested that quantum mechanics is important in the most important biological process happening on earth, leading to the genesis of (according to some scientists) the subject of quantum biology. An overview of these studies, stressing on the theoretical approaches that we have developed will be given. Our study shows that pure electronic coherence would not last as long as it has been suggested, viz., 600 fs, but would die out much faster. 



1. G. Engel, T. Calhoun, E. Read, T.-K.Ahn, T. Mancal, Y.-C. Cheng, R. Blankenship, and G. Fleming, Nature, 446, 782 (2007).

2. A. Ishizaki and G. Fleming, Proceedings of the National Academy of Sciences of the United States of America, 106, 17255 (2009).

3. E. Collini, C. Wong, K. Wilk, P. Curmi, P. Brumer, and G. Scholes, Nature, 463, 644 (2010).

4. P. Nalbach, D. Braun, and M. Thorwart, Physical Review E, 84, 041926 (2011).

5. P. Bhattacharyya and K. L. Sebastian, Physical Review E 87, 062712 (2013).

6. P. Bhattacharyya and K. L. Sebastian J. Phys. Chem. A, (2013) 

Thursday, July 28, 2016