aspuru-list November 2013

aspuru-list@lists.fas.harvard.edu

34 participants
83 discussions

[Aspuru-Guzik group list] [qip] lunch tomorrow

by Henry Yuen

Hi all, Let's get lunch tomorrow (Tuesday) again! The plan is, as usual: meet at CTP at 11:50, going to trucks, and returning by 12:10. Best, Henry _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

10 years, 5 months

[Aspuru-Guzik group list] [IACS-events] IACS Seminar featuring Hugo Larochelle on Friday, 11/22

by Baker, Natasha

Date: Friday, November 22, 2013 Location: Maxwell-Dworkin G115, 33 Oxford Street, Cambridge, MA 02138 Speaker: Hugo Larochelle, Assistant Professor at the Université de Sherbrooke Time: Informal lunch with speaker, 12:30pm. Talk, 1:00pm Title: Deep Learning for Distribution Estimation Abstract: Deep learning methods attempt to learn a deep and distributed representation of data directly from its low-level representation. The motivating argument is that high-dimensional data in AI-related domains (speech, computer vision, natural language) can take a more meaningful representation as a decomposition into several layers of abstractions, decomposing its different factors of variation. Deep learning methods thus try to discover and learn this representation directly from data. In this talk, I will first discuss the basic concepts and methods behind deep learning, reviewing in particular the impressive advancements to the state-of-the-art it has recently permitted in speech recognition and visual object recognition. I will then present my recent research on using neural networks for the task of distribution/density estimation, a fundamental problem in machine learning. Specifically, I will discuss the neural autoregressive distribution estimator (NADE), a state-of-the-art estimator of the probability distribution of data. I will also describe a deep version of NADE, which again illustrates the statistical modelling power of deep models. Speaker bio: Hugo Larochelle is Assistant Professor at the Université de Sherbrooke (UdeS). Before joining the Computer Science department of UdeS in 2011, he spent two years in the machine learning group at University of Toronto, as a postdoctoral fellow under the supervision of Geoffrey Hinton. He obtained his Ph.D. at Université de Montréal, under the supervision of Yoshua Bengio. He is the recipient of two Google Faculty Awards, acts as associate editor for the IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI) and is a member of the editorial board of the Journal of Artificial Intelligence Research (JAIR). Please visit http://iacs.seas.harvard.edu/events to subscribe to our Google calendar, manage your subscription to this mailing list, or access video and audio recordings of previous seminars. _______________________________________________ Iacs-events mailing list Iacs-events(a)seas.harvard.edu https://lists.seas.harvard.edu/mailman/listinfo/iacs-events

10 years, 5 months

[Aspuru-Guzik group list] Excitonics Seminar: Thursday, Nov. 21, 2013

by Catherine M Bourgeois

Please post and forward to your group(s). _________________________________ Center for Excitonics Seminar Series<http://www.rle.mit.edu/excitonics/events.htm> Thursday, Nov 21, 2013 3:00 - 4:00 PM RLE Haus Room: 36-428 Programming Matter on Nanoscale Oleg Gang, Center for Functional Nanomaterials, Brookhaven National Laboratory Abstract: In the last decade nanoscale objects emerged as a novel type of matter with unique functional properties and a plethora of prospective applications. Although a broad range of nano-synthesis methods has been developed, our abilities to organize these components in arbitrarily designed architectures in space and time are still quite limited. In this regard, an incorporation of biomolecules into a nano-object design provides a unique opportunity to establish highly selective and reversible interactions between components of nano-systems. Such bio-encoding can provide a syntax of inter-particle interactions. Consequently, programming of complex and dynamically tunable systems via self-assembly becomes conceptually feasible: biomolecules act as site-specific scaffolds, smart assembly guides and reconfigurable structural elements. I will discuss our advances in addressing this problem using the DNA platform, in which a high degree of addressability of nucleic acids is used to direct the formation of structures from nanoscale synthetic components. Our work explores the leading parameters and principles of programmable organization of inorganic nano-components into well-defined three-dimensional superlattices, two-dimensional membranes and finite-sized clusters. Our progress on the assembly of structures with designed lattice symmetries and clusters with predetermined architectures will be discussed. The realizations of switchable and tunable systems, as well as the relevance of these approaches to optical applications will be also demonstrated. Research is supported by the U.S. DOE Office of Science and Office of Basic Energy Sciences under contract No. DE-AC-02-98CH10886. Bio Oleg Gang received his M.Sc. in 1994 and his Ph.D. in 2000, both from Bar-Ilan University, Israel. He was a Postdoctoral Rothschild Fellow at Harvard University from 2000 - 2002 and a Postdoctoral Goldhaber Fellow at Brookhaven National Laboratory (BNL) from 2002-2004. In 2004, he worked as Assistant Scientist at the Center for Functional Nanomaterials (CFN) at BNL, and in 2006 he became an Associate Scientist at CFN. He currently is Leader for Soft Matter and Bio-Nanomaterials Theme in CFN and is Adjunct Professor of Chemistry at SUNY, Stony Brook, NY. His research focuses on assembly of clusters and extended arrays (2D and 3D) from nanoscale components of multiple types driven by DNA recognition, chain effects and geometrical factors. He and his team's work explores how bioencoding of nanoparticle can guide the formation of well-defined structures, how the morphology of those self-organized structures can be dynamically regulated, and what factors govern system's phase behavior. 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 Energy Sciences

10 years, 5 months

[Aspuru-Guzik group list] talk by Alex Eisfeld, Friday Nov 22, 5pm Division Room

by Semion Saikin

Here is the title and the abstract of Alexes talk ******************************************************************************************************** OPTICAL AND TRANSPORT PROPERTIES OF MOLECULAR AGGREGATES (what else) The transition dipole-dipole interaction between closely spaced chromophores leads to delocalized excitonic states which often results in drastic changes in the optical properties, exemplified for example by the narrow red-shifted J-band of certain organic dye molecules. This interaction is also responsible for the transfer of electronic excitation between the chromophores. The optical and transfer properties depend not only on the arrangement of the chromophores within the aggregate, but also crucially on the interaction of the electronic excitation with nuclear degrees of freedom and the charge distribution of the environment. In this talk I will discuss an quantum open-system approach to model these coupling to nuclear and environmental degrees of freedom. To solve the open system dynamics we use the non-Markovian Quantum State Diffusion approach. I will present a new, numerically exact and efficient solution of the resulting stochastic Schrödinger equations. Finally, I will discuss how we calculate non-adiabatic excitation transport and optical spectra. ********************************************************************************************************* I'll send a reminder closer to that date Semino -- ******************************************** Semion K. Saikin, PhD Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138 email: saykin(a)fas.harvard.edu phone: (619)212-6649 ********************************************

10 years, 5 months

[Aspuru-Guzik group list] visit and talk by Alex Eisfeld, Nov 20-23

by Semion Saikin

Dear Group, Next week, Wed. Nov 20 - Sat. Nov. 23, our colleague and former group member Alex Eisfeld of Max Planck Institute, Dresden http://www.pks.mpg.de/~eisfeld/ is visiting us. He will give a talk on Friday at 4pm in the Division room. I'll send the title and the abstract of his talk in the following email. For those who doesn't know Alex, he is a very knowledgeable person. I would strongly recommend our graduate students talk to him. Best, Semion -- ******************************************** Semion K. Saikin, PhD Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138 email: saykin(a)fas.harvard.edu phone: (619)212-6649 ********************************************

10 years, 5 months

[Aspuru-Guzik group list] Fwd: [iqim] IQIM postdoctoral scholars

by Alan Aspuru-Guzik

Alán Aspuru-Guzik | Professor of Chemistry and Chemical Biology Harvard University | 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru ---------- Forwarded message ---------- From: John Preskill <preskill(a)theory.caltech.edu> Date: Fri, Nov 15, 2013 at 4:35 PM Subject: [iqim] IQIM postdoctoral scholars To: "iqim(a)cms.caltech.edu" <iqim(a)cms.caltech.edu> The Institute for Quantum Information and Matter (IQIM) at Caltech invites applications for postdoctoral scholar positions. IQIM investigators, spanning Caltech's departments of physics, applied physics, and computer science, conduct theoretical and experimental research in quantum information science, quantum condensed matter physics, quantum optics, and the quantum mechanics of mechanical systems. IQIM also has active visitor, seminar, and outreach programs. Please bring this opportunity to the attention of potential applicants, who may apply online at https://applications.caltech.edu/job/iqim Electronic copies of the candidates curriculum vitae, publication list, statement of research interests, and three letters of recommendation are required. Review of applications begins on *December 6, 2013*; applicants are strongly encouraged to submit all materials by that date. The appointment is contingent upon completion of a Ph.D. If there are any questions during the search process, please contact us at iqim-pd(a)caltech.edu. The California Institute of Technology is an Equal Opportunity/Affirmative Action employer. Women, Minorities, Veterans and Disabled Persons are encouraged to apply.

10 years, 5 months

[Aspuru-Guzik group list] coffee club at 1:30

by Joey Goodknight

Come get fancy hippy coffee in the break room at 1:30 before group meeting! $1 per cup requested. -Joey

10 years, 5 months

[Aspuru-Guzik group list] Crap

by Joey Goodknight

We're going to need at least an A- to balance this out -Joey ************** Please forgive my terseness; I am writing this on my phone.

10 years, 5 months

[Aspuru-Guzik group list] ROOM CHANGE: Leonid Levitov - TODAY, 3 pm in RM 56-114

by Catherine M Bourgeois

PLEASE NOTE: TODAY's TALK HAS BEEN MOVED TO 56-114 From: Catherine M Bourgeois [mailto:cmbourg@MIT.EDU] Sent: Thursday, November 14, 2013 9:38 AM To: 'efrc-all(a)mit.edu' Subject: FW: Excitonics Seminar - Leonid Levitov - TODAY, 3 pm, RM 6-233 _________________________________ Center for Excitonics Seminar Series Thursday, Nov 14, 2013 3:00 - 4:00 PM Amdur Conference Room: 6-233 * Energy Waves and Plasmons in Graphene Leonid Levitov, Dept. Of Physics, MIT Abstract: Materials in which heat and entropy can be transmitted by directed ballistic pulses, are of keen interest and importance both scientifically and technologically. Scientifically, they enable fundamentally new unconventional modes of energy transfer which rely on collective wave-like behavior akin to light or sound propagation. Technologically, directed ballistic heat pulses can trigger new approaches to energy transduction in solids. Collective wave-like energy transfer has been predicted for relativistic matter under extreme conditions (cosmic sound). This talk will discuss an electronic analog of cosmic sound that can be realized in the thermal electron-hole plasma in graphene. The new behavior originates from rapid exchange of energy and momentum in particle collisions leading to energy propagation as a collective weakly damped oscillation. Due to the electronic nature of this mode, the estimated propagation velocity can be orders of magnitude faster than that for previously studied phonon mechanisms. The energy mode is uncharged at charge neutrality, but becomes coupled to charge dynamics upon doping. This coupling, combined with the techniques developed recently to study plasmons in nanosystems such as carbon nanotubes and graphene, can be employed for an all-electric excitation and detection of energy transport. This talk will also briefly discuss several other topics of interest concerning plasmons, hot carriers and excitons in atomically thin layered materials: multiple carrier generation in the photo-excitation cascade, plasmon generation in the presence of a DC current (electronic flute), exciton Berry's phase, topological currents and anomalous Hall transport. Bio Leonid Levitov received his M.A. in Physics cum laude at Moscow Physical-Technical Institute in 1985 and his Ph.D. in Theoretical Physics at Landau Institute in 1989. He pioneered in the theory of quasicrystals, orderly materials with non-crystallographic symmetries, discovered in 1985 and in the theory of quantum noise in coherent electron transport. He also developed theory of electronic properties of graphene, in particular, new device concepts based on common-path interference and Klein tunneling, and theory of spin Hall effect which explained the giant nonlocality observed in graphene. He has published over a 100 refereed papers and reviews in the fields of quantum transport, solid-state quantum computing, cold atoms, quantum noise, growth and pattern formation. Currently, he is a Professor of Physics at MIT and leads the Condensed Matter Theory Research Group. 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 Energy Sciences Light refreshments will be served. Please note location: Amdur Conference Room: 6-233 *

10 years, 5 months

[Aspuru-Guzik group list] Excitonics Seminar - Leonid Levitov - TODAY, 3 pm, RM 6-233

by Catherine M Bourgeois

Please post and forward to your group. _________________________________ Center for Excitonics Seminar Series Thursday, Nov 14, 2013 3:00 - 4:00 PM Amdur Conference Room: 6-233 * Energy Waves and Plasmons in Graphene Leonid Levitov, Dept. Of Physics, MIT Abstract: Materials in which heat and entropy can be transmitted by directed ballistic pulses, are of keen interest and importance both scientifically and technologically. Scientifically, they enable fundamentally new unconventional modes of energy transfer which rely on collective wave-like behavior akin to light or sound propagation. Technologically, directed ballistic heat pulses can trigger new approaches to energy transduction in solids. Collective wave-like energy transfer has been predicted for relativistic matter under extreme conditions (cosmic sound). This talk will discuss an electronic analog of cosmic sound that can be realized in the thermal electron-hole plasma in graphene. The new behavior originates from rapid exchange of energy and momentum in particle collisions leading to energy propagation as a collective weakly damped oscillation. Due to the electronic nature of this mode, the estimated propagation velocity can be orders of magnitude faster than that for previously studied phonon mechanisms. The energy mode is uncharged at charge neutrality, but becomes coupled to charge dynamics upon doping. This coupling, combined with the techniques developed recently to study plasmons in nanosystems such as carbon nanotubes and graphene, can be employed for an all-electric excitation and detection of energy transport. This talk will also briefly discuss several other topics of interest concerning plasmons, hot carriers and excitons in atomically thin layered materials: multiple carrier generation in the photo-excitation cascade, plasmon generation in the presence of a DC current (electronic flute), exciton Berry's phase, topological currents and anomalous Hall transport. Bio Leonid Levitov received his M.A. in Physics cum laude at Moscow Physical-Technical Institute in 1985 and his Ph.D. in Theoretical Physics at Landau Institute in 1989. He pioneered in the theory of quasicrystals, orderly materials with non-crystallographic symmetries, discovered in 1985 and in the theory of quantum noise in coherent electron transport. He also developed theory of electronic properties of graphene, in particular, new device concepts based on common-path interference and Klein tunneling, and theory of spin Hall effect which explained the giant nonlocality observed in graphene. He has published over a 100 refereed papers and reviews in the fields of quantum transport, solid-state quantum computing, cold atoms, quantum noise, growth and pattern formation. Currently, he is a Professor of Physics at MIT and leads the Condensed Matter Theory Research Group. 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 Energy Sciences Light refreshments will be served. Please note location: Amdur Conference Room: 6-233 *

10 years, 5 months

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aspuru-list November 2013