aspuru-list May 2011

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23 participants
66 discussions

[Aspuru-Guzik group list] [Aspuru-meetings-list] Bredas talk TOMORROW!

by Johannes Hachmann

Hi everybody, As many of you may already know, Jean-Luc Bredas (http://www.bredators.gatech.edu/) from Georgia Tech - one of the big names in computational studies of organic electronics - will visit the Boston area to give a talk in the Theoretical Chemistry Lecture Series. His talk is TOMORROW (!) from 4-6pm at MIT 4-149 (note the new location!). Please find his title and abstract below. Best wishes Johannes ----------------------------------------------- Electronic and Optical Processes in Organic Semiconductors: The Case of Organic Solar Cells This presentation seeks to provide a basic understanding of the most important electronic and optical processes taking place in devices based on organic semiconductors, by taking organic solar cells as an example. We will address in particular issues related to: (i) photon absorption and exciton migration; (ii) exciton dissociation and charge separation at the organic-organic interface; and (iii) charge transport. ----------------------------------------------- Dr. Johannes Hachmann Postdoctoral Fellow Aspuru-Guzik Research Group Harvard University Department of Chemistry and Chemical Biology 12 Oxford St, Rm M104A Cambridge, MA 02138 USA eMail: jh(a)chemistry.harvard.edu ----------------------------------------------- _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years, 12 months

[Aspuru-Guzik group list] Announcemenet: Excitonics Seminar, Tues. May 10, 3pm, RLE Conf. 36-428

by Cathy Bourgeois

Please forward to your groups and post in your area. thanks Center for Excitonics Seminar Series Announcement Tuesday, May 10, 2011 3:00 PM RLE Conference Room: 36-428 Speaker: Benoît Deveaud-Plédran, Ecole Polytechnique Fédérale de Lausanne Bose-Einstein condensates of polaritons: Vortices and superfluidity Abstract The idea of a possible Bose Eintein condensation in the solid state has been explored since the beginning of the sixties with the hope to get transition temperatures much more accessible than the temperatures needed for the condensation of atomic vapors (less than 1µK for Rubidium). The advantage in solids is that people are trying to condense excitons (an electron-hole pair in a semiconductor) with a mass similar to that of an electron, i.e. four orders of magnitude less than a rubidium atom. The price to pay is the disorder inherent to any real solid state system as well as the limited lifetime of the quasiparticles. We are using exciton polaritons, quasiparticles made one half for excitons and one half from a confined photon. Polaritons are bosons with a mass five orders of magnitude lighter than an electron. Then, condensation at temperatures of the order of 300 K has been observed. The price to pay is the incredibly short lifetime of the polaritons : one picosecond. During this talk, I will detail our studies on the physical properties of polariton condensates. In particular, I will focus on the evidence for superfluidity through the observation of quantized vortices. I will show their time resolved behavior, and show the first direct evidence for half quantized vortices, a specialty of spinor condensates. Bio Benoit Deveaud-Plédran is a full professor in Physics at the Ecole Polytechnique Fédérale de Lausanne having received his Physics Engineering degree from the Ecole Polytechnique, Paris in 1974, his Masters degree in Optoelectronics from Rennes University in 1977, and his PhD from Grenoble University in 1984. Amongst his many awards and recognitions are the 1985 Young Researcher Award from Paris' Ministry of Defense, the 2004 Best Teacher Award from EPFL, and the 2009 Outstanding Referee Award from Physical Review Letters. He is a specialist in the optical spectroscopy of semiconductors with a particular dedication to ultrafast and coherent optical spectroscopy. Over the last few years his team has expanded the understanding of coherent optical spectroscopy by developing a whole ensemble of actively stabilized interferometers, able to perform spectral interferometry as well as a profound understanding of the physics of semiconductor microcavities. Light refreshments will be served The Center for Excitonics is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic

12 years, 12 months

[Aspuru-Guzik group list] 2 day Quantum info conference at MIT

by J D Whitfield

http://www.rle.mit.edu/xqit/conference2011/Schedule2.htm J. D. Whitfield Aspuru-Guzik Group Department of Chemistry and Chemical Biology Harvard University tel: 301-520-7847 web: aspuru.chem.harvard.edu/people/James_Whitfield

12 years, 12 months

[Aspuru-Guzik group list] [qip] meeting not

by Edward Farhi

Dear Quanta We will not meet on Tuesday of this week because of this conference at MIT: http://www.rle.mit.edu/xqit/conference2011/Schedule2.htm 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, 12 months

[Aspuru-Guzik group list] Fwd: ***WED MAY 4 **** JAPC Talk: Paul Corkum (Ottawa) "Laser Induced Molecular Imaging" @4:30pm in Jeff 356

by Anna B. Shin

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…> ---------- Forwarded message ---------- From: Creson, Jeff <creson(a)chemistry.harvard.edu> Date: Mon, May 2, 2011 at 11:26 AM Subject: Fwd: ***WED MAY 4 **** JAPC Talk: Paul Corkum (Ottawa) "Laser Induced Molecular Imaging" @4:30pm in Jeff 356 To: "Kilroy, Matthew" <kilroy(a)chemistry.harvard.edu>, "Shin, Anna B" < anna(a)chemistry.harvard.edu> Hi Anna and Matt, My students thought your groups might be interested in the talk advertised below if you'd like to forward the announcement on to your students... Best, -Jeff Jeff Creson Lab Administrator for Professor Hongkun Park Department of Chemistry and Chemical Biology & Department of Physics Harvard University Tel 617-384-7998 Fax 617-384-7920 http://www.fas.harvard.edu/~hpark/ Begin forwarded message: *From: *Adam Ackerman <ackerman(a)physics.harvard.edu> *Date: *May 2, 2011 9:15:42 AM EDT *To: *"Creson, Jeff" <creson(a)chemistry.harvard.edu> *Subject: *****WED MAY 4 **** JAPC Talk: Paul Corkum (Ottawa) "Laser Induced Molecular Imaging" @4:30pm in Jeff 356* Hello Jeff, Can I ask you to forward this announcement to the Park group and any other Chemistry groups that may have an interest? Thanks, Adam Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP)/ Harvard University Department of Physics Joint Atomic Physics Colloquium ________________ Speaker: Professor Paul Corkum (University of Ottawa), Director NRC Attosecond Science Program Title: Laser Induced Molecular Imaging Time: Wednesday, May 4, 2011 @ 4:30 p.m. - Tea @ 4:00 p.m. Place: Jefferson 356, Harvard Physics Sponsored by Institute for Theoretical Atomic, Molecular and Optical Physics ITAMP (http://itamp.harvard.edu) and Harvard Physics Department (http://www.physics.harvard.edu) ------------------------------------------- -- -- *Adam Ackerman* Sponsored Funds Portfolio Manager *Department of Physics* P: 617-495-4475 F: 617-495-0416 E: ackerman(a)physics.harvard.edu _______________________________________________ Harvard University <http://www.harvard.edu/> Department of Physics <http://www.physics.harvard.edu/> 17 Oxford Street<http://map.harvard.edu/level3.cfm?mapname=camb_allston&tile=F6&quadrant=C&s…> Cambridge, MA 02138 Please consider the environment before printing this email

12 years, 12 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Paul Corkum: Joint Atomic Physics Colloquium

by babb

Paul Corkum: Joint Atomic Physics Colloquium Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP)/ Harvard University Department of Physics Joint Atomic Physics Colloquium ________________ Speaker: Professor Paul Corkum, University of Ottawa, National Research Council (Canada) Title: Laser Induced Molecular Imaging Time: Wednesday, May 4, 2011 @ 4:30 p.m. - Tea @ 4:00 p.m. Place: Jefferson 356, Harvard Physics Sponsored by Institute for Theoretical Atomic, Molecular and Optical Physics ITAMP (http://itamp.harvard.edu) and Harvard Physics Department (http://www.physics.harvard.edu) ------------------------------------------- Abstract: New methods for probing molecules and their dynamics arise from the highly nonlinear interaction between short infrared pulses and matter. One new method is laser induced tunnelling. I will show that tunnelling accurately describes ionization in short infrared light pulses [1] and that measuring the angle dependent ionization probability of a molecule is analogous to measuring the position dependent tunnelling rate on a surface with an STM [2]. A second is high harmonic spectroscopy. When tunnel ionization occurs in a moderate density gas, high harmonics are produced. The high harmonic signal encodes information similar to that available from photoelectron spectroscopy but with coherence. I will show how high harmonic spectroscopy can be used to follow molecular dissociation of Br2 [3] and to probe features of asymmetric molecules such as CO [4]. [1] L. Arissian et al, Phys. Rev. Lett. 105, 133002 (2010) [2] H. Akagi et al, Science 325, 1364 (2009) [3] H. Worner et al, Nature 466, 603 (2010) [4] E. Frumker et al, unpublished results -- Lisa Bastille • Administrative Coordinator • ITAMP Harvard - Smithsonian Center for Astrophysics • 60 Garden Street, MS 14 • Cambridge, MA 02138-1516 • phone: (617) 495-9524 • fax: (617) 495-5970 • email: lbastill(a)cfa.harvard.edu _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years, 12 months

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aspuru-list May 2011