aspuru-list September 2011

aspuru-list@lists.fas.harvard.edu

34 participants
95 discussions

[Aspuru-Guzik group list] Announcement: Excitonics Seminar, TODAY. Sept. 20, 3 pm, 36-428

by Cathy Bourgeois

Center for Excitonics Seminar Series Announcement TUES, SEPT 20, 2011 3:00 PM RLE Haus Room: 36-428 "PROBING VALENCE AND CORE EXCITONS IN MOLECULES BY COHERENT MULTIDIMENSIONAL SPECTROSCOPY WITH CLASSICAL AND QUANTUM LIGHT" Shaul Mukamel, Dept. of Chemistry, University of California, Irvine Abstract Multidimensional spectroscopic techniques which originated with NMR in the 1970's have been extended over the past 18 years to the infrared and visible regimes. Novel extensions of these ideas to study excitons in the ultraviolet and the x-ray regimes, which make use of entangled photons, will be discussed. Two dimensional ultraviolet (2DUV) spectra of protein backbone and side chains are presented. The signals provide new insights into the protein structures, dynamics and functions. Simulated chirality-induced 2DUV spectra reveal characteristic patterns of protein secondary structures, and explore the structure and aggregation mechanism of amyloid fibrils which are associated with over 20 diseases related to protein misfolding. Signatures of aggregation propensity of peptides are identified. Energy- transfer and charge-separation pathways in the reaction center of photosystem II may be revealed by two-dimensional techniques in the visible. The excited state dynamics and relaxation of electrons and holes and their 2D signatures are simulated. Time-domain experiments that employ sequences of attosecond x-ray pulses in order to probe electronic and nuclear dynamics in molecules are made possible by newly developed bright coherent ultrafast sources of soft and hard x-rays. By creating multiple core holes at selected atoms and controlled times it is possible to study the dynamics and correlations of valence electrons as they respond to these perturbations. Electron motions can thus be directly probed by detecting x-ray photons or photoelectrons. Two-dimensional stimulated x-ray resonant Raman spectra of core excitons are predicted. Novel 2D signals that make use of entangled photons will be presented. Entangled photons offer an unusual combination of bandwidths and temporal resolution not possible by classical beams. Contributions from different resonances can be selected by varying the parameters of the photon wave function. An assembly of non interacting atoms may become correlated upon interaction with entangled photons, and their density matrix can then show collective resonances. Possible experimental signatures of these effects are explored. Bio Shaul Mukamel received his B.Sc degree in Chemical Physics in 1969 and his Ph.D. in 1976 both from Tel Aviv University. He served on the faculty of the Weizmann Institute and Rice University and in 1982 he joined the chemistry department of the University of Rochester and became a professor in 1985. In 2000 he became the Kenneth Mees Professor and in 2003 was appointed joint Professor of Physics. Since 2003 he serves on the faculty of UC Irvine as a Chancellor Professor of Chemistry. Professor Mukamel's group interests focus on the design of novel ultrafast multidimensional coherent optical spectroscopies for probing and controlling electronic and vibrational molecular dynamics in the condensed phase; Theoretical and computational studies and applications include attosecond nonlinear x-ray spectroscopy of molecules; Many-body theory of optical and photonic materials; a time dependent reduced density matrix framework for computing electronic excitations and nonlinear optical spectroscopy of conjugated polymers, molecular nanostructures, chromophore aggregates and semiconductor and solar cell nanoparticles; Folding and dynamical fluctuations in proteins and DNA; Long range electron transfer, energy funneling, and collective nonlinear optical response of biological light harvesting complexes; Photon statistics in single molecule spectroscopy; Nonlinear dynamics and fluctuations in quantum and classical optical response. Light refreshments will be served.

12 years, 8 months

[Aspuru-Guzik group list] Temporary accomodation

by Xavier Andrade

Hi, Esa Rasanen from the University of Jyväskylä, Finland contacted me to ask me if I know of a temporary accomodation from October to December for him and his family. For that time he will be visiting Heller's group. I guess some of you would be interested in his research (Quantum Control and Dynamics [1]). [1] https://www.jyu.fi/fysiikka/en/research/material/theornanophys/control If you know of any possible accomodation, you can contact him through me or directly ( erasanen(a)jyu.fi ). Thanks, Xavier

12 years, 8 months

[Aspuru-Guzik group list] Fwd: Faculty position in Theoretical Physics/Bio-Nano-Physics at the University of Innsbruck

by Aspuru

Alan Aspuru-Guzik Associate Professor Harvard University http://aspuru.chem.harvard.edu Sent from my mobile. Please pardon any typos. Begin forwarded message: > From: "Briegel, Hans" <Hans.Briegel(a)uibk.ac.at> > Date: September 19, 2011 8:02:02 AM CDT > Subject: Faculty position in Theoretical Physics/Bio-Nano-Physics at the University of Innsbruck > > Dear Colleague, > > > > we would like to draw your attention to the announcement of a faculty position > > in Theoretical Physics/Bio-Nano-Physics at the University of Innsbruck. > > > > We would be very grateful if you could forward this information to your colleagues > > and to potentially interested candidates. > > > > The English text of the announcement appeared in the August issue of Physics Today > > (see attachment), and there was also an advertisement on July 21, 2011, in Die Zeit. > > > > For further information, please see the attached file. The full, authoritative text in German > > (published in the official bulletin of the University of July 20th, 2011) as well as additional > > information on the current status of the application process may be found at: > > http://www.uibk.ac.at/fakultaeten-servicestelle/standorte/technikerstrasse/… > > > > The application deadline for this position is September 26th, 2011. > > > > Yours sincerely, > > Hans J Briegel > > (on behalf of the Search Committee) > > > > -- > > Hans J. Briegel > > Professor of Theoretical Physics > > University of Innsbruck > > Telephone: +43-512-507-6216 (ITP: -6202; IQOQI: -4740) > Secretary: elke.woelflmaier(a)uibk.ac.at > >

12 years, 8 months

[Aspuru-Guzik group list] new postdoc Takatoshi Fujita

by Anna B. Shin

Dear Group, New postdoc Takatoshi Fujita has arrived! Please introduce yourselves to him at group meeting today and give a helping hand if he has questions acclimating to the wonderful world of Harvard. [?] I have added Taka to the mailing list. His email is also above. Best, Anna Anna B. Shin Laboratory Administrator | Aspuru-Guzik Research Group Department of Chemistry and Chemical Biology | Harvard University 12 Oxford Street | Cambridge, MA 02138 617.496.9964 office | 617.694.9879 cell | 617.496.9411 fax http://aspuru.chem.harvard.edu/ <https://mail.google.com/mail/u/0/?ui=2&ik=e7480c62f0&view=att&th=12eee19970…>

12 years, 8 months

[Aspuru-Guzik group list] jdw.thesis.pdf

by Jay Whitfield

Hi everyone, Thanks for an amazing 5 years. In return, here's a link to "jdw.thesis.pdf" http://db.tt/Hv41IIp. Warmest regards, James J. D. Whitfield NEC Lab America, Quantum Information Technology Columbia University, Physics Department Tel: 609-903-8824 Web: aspuru.chem.harvard.edu/People/James_Whitfield

12 years, 8 months

[Aspuru-Guzik group list] [qip] Tuesday

by Edward Farhi

Hi Quanta You will meet on Tuesday, September 20, at 11:00 in the usual spot. I will be away till Saturday so I will not be at the meeting. Shelby is going to tell us about what she did over the summer. Best, Eddie ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Edward Farhi Cecil and Ida Green Professor of Physics Director Center for Theoretical Physics Massachusetts Institute of Technology 6-300 Cambridge MA 02139 617 253 4871 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

12 years, 8 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Group meeting by Man Hong tomorrow

by Joel Yuen

When: Monday September 19 from *2:30 to 3:30 PM* (for exceptional reasons we are starting 30 min after the regular time*) Where: Cabot Division Room at Mallinckrodt. What: Man Hong is up for group meeting: Title: Two topics: linear response theory for entropy, and binary-signal detection problem Abstract: I will be talking about two unrelated topics, (I) linear response theory for entropy, and (II) binary-signal detection problem. The former one integrates an idea from Cesar's previous work with the linear response theory. I can show that, the first order responses of entropy (and also purity) for any initially uncorrelated states are always zero. The second part I will talk about is a simple proof I discovered that shows how to optimally distinguish two set of multiple copies of non-orthogonal states, i.e. set A: |a>|a>...|a> and set B: |b>|b>...|b>. * Also, we will need to discuss the new group meeting time again. Seems that some people made a mistake in their entries to the poll. Maybe we can talk about this before Man Hong's talk. -- Joel Yuen-Zhou PhD candidate in Chemical Physics Harvard University CCB, 12 Oxford St. Mailbox 107, Cambridge, MA, USA. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years, 8 months

[Aspuru-Guzik group list] macbook adapter

by Sule Atahan-Evrenk

Dear all, sorry to bother you but I was wondering if anybody borrowed my macbook adapter from my desk. thanks, sule.

12 years, 8 months

[Aspuru-Guzik group list] Announcement: Excitonics Seminar, Tues. Sept. 20, 3 pm, 36-428

by Cathy Bourgeois

Please post in your area and forward to your groups. Thanks Center for Excitonics Seminar Series Announcement TUES, SEPT 20, 2011 3:00 PM RLE Haus Room: 36-428 "PROBING VALENCE AND CORE EXCITONS IN MOLECULES BY COHERENT MULTIDIMENSIONAL SPECTROSCOPY WITH CLASSICAL AND QUANTUM LIGHT" Shaul Mukamel, Dept. of Chemistry, University of California, Irvine Abstract Multidimensional spectroscopic techniques which originated with NMR in the 1970's have been extended over the past 18 years to the infrared and visible regimes. Novel extensions of these ideas to study excitons in the ultraviolet and the x-ray regimes, which make use of entangled photons, will be discussed. Two dimensional ultraviolet (2DUV) spectra of protein backbone and side chains are presented. The signals provide new insights into the protein structures, dynamics and functions. Simulated chirality-induced 2DUV spectra reveal characteristic patterns of protein secondary structures, and explore the structure and aggregation mechanism of amyloid fibrils which are associated with over 20 diseases related to protein misfolding. Signatures of aggregation propensity of peptides are identified. Energy- transfer and charge-separation pathways in the reaction center of photosystem II may be revealed by two-dimensional techniques in the visible. The excited state dynamics and relaxation of electrons and holes and their 2D signatures are simulated. Time-domain experiments that employ sequences of attosecond x-ray pulses in order to probe electronic and nuclear dynamics in molecules are made possible by newly developed bright coherent ultrafast sources of soft and hard x-rays. By creating multiple core holes at selected atoms and controlled times it is possible to study the dynamics and correlations of valence electrons as they respond to these perturbations. Electron motions can thus be directly probed by detecting x-ray photons or photoelectrons. Two-dimensional stimulated x-ray resonant Raman spectra of core excitons are predicted. Novel 2D signals that make use of entangled photons will be presented. Entangled photons offer an unusual combination of bandwidths and temporal resolution not possible by classical beams. Contributions from different resonances can be selected by varying the parameters of the photon wave function. An assembly of non interacting atoms may become correlated upon interaction with entangled photons, and their density matrix can then show collective resonances. Possible experimental signatures of these effects are explored. Bio Shaul Mukamel received his B.Sc degree in Chemical Physics in 1969 and his Ph.D. in 1976 both from Tel Aviv University. He served on the faculty of the Weizmann Institute and Rice University and in 1982 he joined the chemistry department of the University of Rochester and became a professor in 1985. In 2000 he became the Kenneth Mees Professor and in 2003 was appointed joint Professor of Physics. Since 2003 he serves on the faculty of UC Irvine as a Chancellor Professor of Chemistry. Professor Mukamel's group interests focus on the design of novel ultrafast multidimensional coherent optical spectroscopies for probing and controlling electronic and vibrational molecular dynamics in the condensed phase; Theoretical and computational studies and applications include attosecond nonlinear x-ray spectroscopy of molecules; Many-body theory of optical and photonic materials; a time dependent reduced density matrix framework for computing electronic excitations and nonlinear optical spectroscopy of conjugated polymers, molecular nanostructures, chromophore aggregates and semiconductor and solar cell nanoparticles; Folding and dynamical fluctuations in proteins and DNA; Long range electron transfer, energy funneling, and collective nonlinear optical response of biological light harvesting complexes; Photon statistics in single molecule spectroscopy; Nonlinear dynamics and fluctuations in quantum and classical optical response.

12 years, 8 months

[Aspuru-Guzik group list] For the FMO people

by Jacob Krich

12 years, 8 months

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aspuru-list September 2011