Saikin, Semion K. - Harvard University - Department of Chemistry and Chemical Biology

研究领域

Molecules in a complex environment I explore the interface between molecules and condensed matter systems. The extended system forms a nanostructured environment that modifies molecular properties. Usually, the environment is considered as an uncontrollable complex system characterized by a minimal set of phenomenological parameters. I am interested in shifting this paradigm towards a "functionalized environment," which can be optimized and tuned for specific applications. Exciton dynamics in J-aggregates Many fluorescent dyes can assemble in short-range-ordered structures, J-aggregates. J-aggregates are characterized by a strong intermolecular coupling which significantly modifies their spectra as compared to spectra of non-interacting molecules. Excitons in J-aggregates are delocalized over tens of molecules and possess a rather high mobility as compared to other organic materials. I study exciton transport in such systems. How exciton localization/delocalization affects the exciton-exciton interaction? How important are the effects of quantum coherence in the exciton transport? Can we observe correlated exciton dynamics in J-aggregates? Decoherence Entanglement of a quantum system with its environment, eventually, leads to the loss of quantum coherence effects. Can we control this process? It has been demonstrated decades ago that time evolution of spin systems can be reversed. But what are the natural boundaries for time reversibility in open quantum systems? I explore these limitations studying evolution of spin systems. Coherent control of quantum systems Single quantum systems can be controlled coherently by external fields. In this project I study the methods of adiabatic optical control for the quantum system dynamics. Adiabatically varying fields are less sensitive to imperfections in the control pulses. Thus, precise operations can be designed. For instance, spins in single or coupled semiconductor quantum dots can be rotated coherently using adiabatic optical pulses. However, to minimize free-evolution decohenrece the operation should be fast. How fast the adiabatic control can be? How it interferes with decoherence?

近期论文

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1. S. S. Kharintsev, A. Kharitonov, S. K. Saikin, Al. Alekseev, S. Kazarian, Nonlinear Raman Effects Enhanced by Surface Plasmon Excitation in Titanium Nitride Nano-Strips, Nano Lett. 17, 5533 - 5539 (2017) D. M. Coles, L. C. Flatten, Th. Sydney, E. Hounslow, S. K. Saikin, A. Aspuru-Guzik, V. Vedral, J. K.-H. Tang, R. A. Taylor, J. M. Smith, D. G. Lidzey, A nanophotonic structure containing living photosynthetic bacteria, Small, 1701777 (2017) S. S. Kharintsev, K. Shukhina, Al. I. Fishman, S. K. Saikin, Effect of secondary relaxation transitions on photo-induced anisotropy in glassy azobenzene-functionalized polymers, J. Matter. Chem. C 5, 6828 - 6833 (2017) S. S. Kharintsev, E. A. Chernykh, Al. I. Fishman, S. K. Saikin, Al. M. Alekseev, M. Kh. Salakhov, Photo-induced heating of free-standing azo-polymer thin films monitored by scanning thermal microscopy, J. Phys. Chem. C 121, 3007 - 3012 (2017) S. S. Kharintsev, A. I. Fishman, S. K. Saikin, and S. G. Kazarian, Near-field Raman dichroism controlled with a biased nanoantenna: from amorphous azo-polymers to optical information storage, Nanoscale, 8, 19867 - 19875 (2016) D. Gelbwaser-Klimovsky, S. K. Saikin, R. H. Goldsmith, and A. Aspuru-Guzik, Optical spectra of p-doped PEDOT nano-aggregates provide insight into the material disorder, ACS Energy Lett., 1, 1100 - 1105 (2016) J. Yuen-Zhou, S. K. Saikin, T. Zhu, M. Onbalsi, C. Ross, V. Bulovic, and M. Baldo, Plexcitons: Dirac points and topological modes, Nat. Commun., 7, 11783 (2016) N. P. D. Sawaya, J. Huh, T. Fujita, S. K. Saikin, A. Aspuru-Guzik, Fast delocalization leads to robust long-range excitonic transfer in a large quantum chlorosome model, Nano Lett., 15, 1722 (2015) D. M. Coles, Y. Yang, Y. Wang, R. T. Grant, R. A. Taylor, S. K Saikin, A. Aspuru-Guzik, D. G. Lidzey, J. K.-H. Tang, J. M. Smith, Strong coupling between the chlorosome of a photosynthetic bacteria and a confined cavity mode, Nat. Commun., 5, 5561 (2014) F. Herrera, B. Peropadre, L. A. Pachon, S. K. Saikin, A. Aspuru-Guzik, Quantum nonlinear optics with polar J-aggregates in microcavities, J. Phys. Chem. Lett. 5, 3708 - 3715 (2014) J. B. Cabalo, S. K. Saikin, E. D. Emmons, D. Rappoport, A. Aspuru-Guzik, A state-by-state investigation of destructive interference in resonance Raman spectra of neutral tyrosine and tyrosinate anion with the simplified sum-over-states approach, J. Phys. Chem. A, 118, 9675 - 9686 (2014) J. Yuen-Zhou, S. K. Saikin, N. Yao, A. Aspuru-Guzik, Topologically protected excitons in porphyrin thin films, Nature Materials, 13, 1026 - 1032 (2014) S. K. Saikin, Y. Khin, J. Huh, M. Hannout, Y. Wang, F. Zare, A. Aspuru-Guzik, J. Kuo-Hsiang Tang, Chromatic acclimation and population dynamics of green sulfur bacteria grown with spectrally tailored light, Sci. Rep. 4, 5057 (2014) S. Valleau, S. K. Saikin, D. Ansari-Oghol-Beig, M. Rostami, H. Mossallaei, A. Aspuru-Guzik, Electromagnetic study of the chlorosome antenna complex of Chlorobium tepidum, ACS Nano 8, 3884 - 3894 (2014) J. Huh, S. K. Saikin, J. C. Brookes, S. Valleau, T. Fujita, A. Aspuru-Guzik, Atomistic study of energy funneling in the light-harvesting complex of green sulfur bacteria, J. Am. Chem. Soc. 136, 2048 - 2057 (2014) T. Fujita, J. Huh, S. K. Saikin, J. C. Brookes, A. Aspuru-Guzik, Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria, Photosynth. Res. 120, 273 - 289 (2014) E. Tkachenko, E. Gutierrez, S. K. Saikin, P. Fogelstrand, C. Kim, A. Groisman, and M. H. Ginsberg, The nucleus of endothelial cell as a sensor of blood flow direction, Bio. Open, 2, 1007 - 1012 (2013) J. K.-H. Tang, S. K. Saikin, S. V. Pingali, M. M. Enriquez, J. Huh, H. A. Frank, V. S. Urban, A. Aspuru-Guzik, Temperature and carbon assimilation regulate the chlorosome biogenesis in green sulfur bacteria , Biophys. J. 105, 1346 - 1356 (2013), preprint arXiv:1307.1742 D. Ansari-Oghol-Beig, M. Rostami, E. Chernobrovkina, S. K. Saikin, S. Valleau, H. Mosallaei, A. Aspuru-Guzik, Parametric hierarchical matrix approach for the wideband optical response of large-scale molecular aggregates, J. Appl. Phys. 114, 164315 (2013) S. K. Saikin, A. Eisfeld, S. Valleau, A. Aspuru-Guzik, Photonics meets excitonics: natural and artificial molecular aggregates, Nanophotonics 2, 21 - 38 (2013)