WITHDRAWN: Quantum Dynamics and Femtosecond Spectroscopy

WITHDRAWN: Quantum Dynamics and Femtosecond Spectroscopy

Accepted Manuscript Preface Quantum Dynamics and Femtosecond Spectroscopy Maxim F. Gelin, Sergei Tretiak, Oleg Prezhdo, Shaul Mukamel PII: DOI: Refere...

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Accepted Manuscript Preface Quantum Dynamics and Femtosecond Spectroscopy Maxim F. Gelin, Sergei Tretiak, Oleg Prezhdo, Shaul Mukamel PII: DOI: Reference:

S0301-0104(16)30897-7 http://dx.doi.org/10.1016/j.chemphys.2016.11.004 CHEMPH 9707

To appear in:

Chemical Physics

Received Date: Accepted Date:

2 November 2016 3 November 2016

Please cite this article as: M.F. Gelin, S. Tretiak, O. Prezhdo, S. Mukamel, Quantum Dynamics and Femtosecond Spectroscopy, Chemical Physics (2016), doi: http://dx.doi.org/10.1016/j.chemphys.2016.11.004

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Preface Quantum Dynamics and Femtosecond Spectroscopy (in honor of Professor Vladimir Y. Chernyak on the occasion of his 60th birthday)

It is a great honor and privilege for us to serve as guest editors for this special issue of Chemical Physics dedicated to our personal friend and great scientist Professor Vladimir Yan Chernyak. Vladimir has made seminal contributions to non-equilibrium statistical mechanics, the theory of femtosecond nonlinear spectroscopy, the theories of open quantum systems and stochastic systems, theoretical chemistry and mathematical physics. He authored over 200 peer reviewed publications. The material systems Vladimir studied include small and polyatomic molecules, molecular aggregates, dendrimers, biological photosynthetic complexes, and organic semiconductors. His research extended well beyond chemical physics. Vladimir developed graphical model approaches relevant to statistical physics of applied probability. His topology studies delve into the world of “immaterial” objects. Frequently, such mathematical abstractions allowed Vladimir to find highly nontrivial interconnections and shortcuts across fields, thus uncovering unusual properties of usual systems. Vladimir has a special place in the academic community. In the time of increasing specialization and narrowing research interests, the work of Vladimir builds bridges among scientists focusing on different areas of chemical physics and theoretical chemistry. Vladimir has a unique, innate ability to look at the gist of the problem from different perspectives and to get unexpected insights. His friends are aware of his narrative way of doing science, when he generates new and highly nontrivial ideas “on the fly”. Conversations and discussions with him are not always easy, due to the challenge to catch up with his flight of thought. Yet, they have been always useful, instructive and inspirational. Vladimir’s prompt and inquisitive way of thinking is remarkable and makes him a prominent figure at conferences and seminars.

The Special Issue is opened by personal reminiscences of Professor Shaul Mukamel, who has been a collaborator of Vladimir for more than twenty years. It is followed by thirty one research papers. The diversity of scientific interests of Vladimir shapes the scope of the Special Issue, which covers a broad spectrum of research in femtosecond nonlinear molecular spectroscopy, quantum dynamics, and stochastic dynamics. Many contributions to this special issue are inspired and/or influenced by Vladimir’s ideas and bear a touch of his personality. We are sure that we express the opinion of all the contributors by wishing Vladimir many more fruitful years of the unique “Chernyak science”. We look towards new exciting projects and collaborations with you!

Maxim F. Gelin Department of Chemistry, Technical University of Munich, Garching, Germany Sergei Tretiak Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA Oleg Prezhdo Department of Chemistry, University of Southern California, Los Angeles, USA

Tribute to Vladimir Chernyak

It gives me great pleasure to write these introductory comments for the special issue honoring Vladimir Chernyak upon his 60th birthday. Vladimir is a truly remarkable scholar with unusual technical talents and physical insights. The overarching theme characterizing Chernyak’s work is developing methods of many-body nonequilibrium statistical mechanics and applying them to treat a diverse set of challenging problems in chemical physics, optics, spectroscopy, networks, algorithms, and optimal control. He had made many novel and creative contributions in broad areas of mathematical physics, chemical physics, field theory, topology, nonequilibrium statistical mechanics, manybody theory, and molecular quantum electrodynamics. His bird’s eye view of complex physical systems had allowed him to connect different areas of science and simplify complex dynamical processes at the very fundamental level. He has an unusual ability to break complex problems into their most elementary pieces and come up with novel and general interpretations of experimental observables. Chernyak belongs to a rare breed of theoreticians who combine thorough formal and analytical skills with the ability to connect to experiments and his work has had a tremendous impact. Chernyak received his Ph.D. from the USSR Academy of Sciences working on many-body theoretical problems related to optical spectroscopy of surfaces. When working in the USSR Academy of Sciences and National Bureau of Standards he made important contributions to quantum integrable dynamical systems with applications to resonant optics, weak and strong localization of light in disordered systems, and propagation of light in systems with rough boundaries. I was most fortunate to work with him as a research associate at the University of Rochester from 1993-2000 and to continue our collaborations ever since. His penetrating depth and rigor were instrumental for developing the nonlinear response formalism of multidimensional spectroscopy. In addition, he had made profound contributions to fluctuation theorems and statistical mechanisms of nonequilibrium states. He developed a theory for the electrodynamics of confined excitons, which lays the foundation for the systematic and consistent treatment of interatomic forces and retardation in nonlinear optical spectroscopy of

molecular nanostructures. His work resulted in a novel microscopic algorithm for computing optical response functions which can treat conjugated-molecules, semiconductors, and molecular and metallic nanostructures within the same framework. It also provides a unified picture for many important effects which are usually introduced phenomenologically such as local fields, cascading, superradiance, polaritons and exciton transport. He further discovered some very profound generalizations of density functional theory to nonequilibrium systems. These are most valuable in the calculations of optical properties of large molecules and materials. Chernyak had rigorously identified the relevant coherence sizes underlying different measurements in femtosecond spectroscopy of photosynthetic antenna complexes. He developed fruitful collaborations at Los Alamos and continued to make highly original contributions in the field of photonic materials. Chernyak has further made important contributions to non-adiabatic dynamics in molecules, including semiclassical density matrix theory of conical intersections and a method computing non-adiabatic couplings via TDDFT. Dendrimeric molecules with branched tree-like structure show unusual transport and optical properties, stemming from their peculiar dimensionality: Together with Sergei Tretiak he had developed an elegant exciton scattering formalism that allows to create optical excitations of conjugated molecules and dendrimers out of small segments properly presenting the coherence. An important consequence of that study was the ability to dissect the electronic excitations of dendrimers into distinct chromophores, despite the delocalized nature of the underlying electronic states. The approach provides a natural framework for the design of supramolecular structures such as artificial light-harvesting antennae with controlled energy funneling pathways, and allows exploring the coherent coupling among different segments. Another notable contribution has been the development of a series of algorithms, based on quantum field theory that allow efficient approximate computations for statistical models that reside on irregular lattices/graphs/networks. His topological view of stochastic currents in driven systems had led to building an extension of optimal stochastic control theory, as well as establishing a variety of general and exact relations that fall into a category of fluctuation theorems, e.g., pumping restriction and pumping quantization theorems, including manyparticle effects in open networks, providing insights into, e.g., robust performance of molecular motors. This volume is timely tribute to Chernyak’s widely felt impact on science and the many past and ongoing collaborations he has made. We all wish him many more productive and successful years. Shaul Mukamel Department of Chemistry, University of California, Irvine, USA