aspuru-list October 2015

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20 participants
66 discussions

[Aspuru-Guzik group list] Fwd: Frontiers in Plasmonics as Enabling Science in Photonics and Beyond

by Alan Aspuru-Guzik

FYI 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: Reinhard, Bjorn M <bmr(a)bu.edu> Date: Tue, Oct 27, 2015 at 10:30 AM Subject: Frontiers in Plasmonics as Enabling Science in Photonics and Beyond To: "mgb(a)mit.edu" <mgb(a)mit.edu>, "tswager(a)mit.edu" <tswager(a)mit.edu>, " ating(a)mit.edu" <ating(a)mit.edu>, "cml(a)cmliris.harvard.edu" < cml(a)cmliris.harvard.edu>, "jaiz(a)seas.harvard.edu" <jaiz(a)seas.harvard.edu>, " alan(a)aspuru.com" <alan(a)aspuru.com>, "cohen(a)chemistry.harvard.edu" < cohen(a)chemistry.harvard.edu>, "dnocera(a)fas.harvard.edu" < dnocera(a)fas.harvard.edu>, "hpark(a)chemistry.harvard.edu" < hpark(a)chemistry.harvard.edu>, "gwhitesides(a)gmwgroup.harvard.edu" < gwhitesides(a)gmwgroup.harvard.edu>, "xie(a)chemistry.harvard.edu" < xie(a)chemistry.harvard.edu>, "zhuang(a)chemistry.harvard.edu" < zhuang(a)chemistry.harvard.edu>, "capasso(a)seas.harvard.edu" < capasso(a)seas.harvard.edu>, "donohoe(a)seas.harvard.edu" < donohoe(a)seas.harvard.edu>, "k.zhang(a)neu.edu" <k.zhang(a)neu.edu>, " m.gibson(a)neu.edu" <m.gibson(a)neu.edu>, "n.israeloff(a)neu.edu" < n.israeloff(a)neu.edu>, "heiman(a)neu.edu" <heiman(a)neu.edu>, " s.kravchenko(a)neu.edu" <s.kravchenko(a)neu.edu>, "l.menon(a)neu.edu" < l.menon(a)neu.edu>, "s.sridhar(a)neu.edu" <s.sridhar(a)neu.edu>, " frank.tsung(a)bc.edu" <frank.tsung(a)bc.edu>, "waegele(a)bc.edu" <waegele(a)bc.edu>, "dunwei.wang.1(a)bc.edu" <dunwei.wang.1(a)bc.edu> Cc: "Mathisen, Beth" <bethmath(a)bu.edu> Dear Colleagues, I would like to draw your attention to the 19th Annual Photonics Center Symposium at Boston University on December 3. This year the theme focuses on Plasmonics and we have invited a diverse group of distinguished speakers to cover a broad range of topics in this area: Dr. Jeremy Baumberg Dr. Peter Nordlander Dr. Jennifer Dionne Dr. George Schatz Dr. Vladimir Shalaev Dr. Suljo Linic For more information about the event, please refer to the attached flyer or go to the event homepage: http://www.cvent.com/d/wrqtx8/1Q I hope you will be able to attend the symposium, and I would appreciate if you could forward this invitation to interested graduate and postdoctoral students in your group. Best Regards, Bjoern Reinhard Associate Professor of Chemistry The Photonics Center Boston University http://www.bu.edu/reinhardlab/

8 years, 6 months

[Aspuru-Guzik group list] Aspuru-Guzik Group Open House - October 28, 2015

by Marlon Cummings

October 28, 2015 CCB Department Center 6PM We will need volunteers for set-up, AV, Music, and clean-up. Thanks, Marlon. ---------- *Marlon G. CummingsLab Manager, Aspuru-Guzik GroupMallinckrodt M136Department of Chemistry and Chemical BiologyHarvard University12 Oxford StreetCambridge, MA 02138617-496-9964617-496-9411 (fax)http://aspuru.chem.harvard.edu/ <http://aspuru.chem.harvard.edu/>*

8 years, 6 months

[Aspuru-Guzik group list] Excitonics Perovskite Seminar: Matt Klug -TODAY Oct 27 - noon in 36-462

by Catherine M Bourgeois

Please post and forward to your groups EXCITONICS Perovskite Seminar Series Computational and Experimental Screening of Mixed-Metal Perovskite Compositions* October 27, 2015 at 12 noon/36-462 Matthew Klug MIT/Department of Biological Engineering [klug] Although solar cells with impressive power conversion efficiencies have been demonstrated using lead-based metal halide perovskites, there are concerns regarding the inherent toxicity and long-term stability of these materials. This talk will focus on recent computational and experimental efforts that explore the feasibility of simultaneously addressing both of these issues by fabricating active layers with mixed-metal compositions, where a portion of the metal content in the perovskite film has been replaced with an alternative, less-toxic metal species. Relevant electronic properties such as the material band gap, carrier effective masses, and band edge locations were theoretically evaluated using density functional theory (DFT). By computationally screening through a series of mixed-metal compositions that spans the periodic table, several promising candidates were identified that preserve the excellent electronic properties of the methylammonium lead triiodide perovskite, MAPbI3, while simultaneously reducing material toxicity. The computational effort was paired with an exhaustive experimental screening study that systematically evaluated how replacing various amounts of lead with nine different metal species impacts material and electronic properties as well as device performance. These findings reveal that introducing a second metal species can influence film morphology, modify the material band gap, shift the band edge locations, impact photoluminescence, and improve photovoltaic performance. The aggregate data provides enough information for us to propose feasible physical mechanisms that explain trends in performance and are consistent with both empirical observations and computations. Furthermore, this work will present preliminary results that suggest some mixed-metal compositions also demonstrate superior resistance to degradation at elevated temperatures. While further experimentation is required to evaluate whether mixed-metal compositions would improve performance of solar cells utilizing different device architectures or perovskite synthesis techniques, this study presents encouraging evidence that introducing alternative metal species can have beneficial impacts on device performance and stability, while simultaneously mitigating toxicity. Matt Klug is a post-doctoral researcher in Prof. Angela Belcher's Biomolecular Materials Group at MIT, where he studies emerging solution-processed solar cells and synthesizes photoactive nanocomposites using biological materials. *This talk is part of the Perovskites Seminar Series organized by Sam Stranks and sponsored by the Center for Excitonics. For more info contact Sam Stranks: stranks(a)mit.edu<mailto:stranks@mit.edu> Light Lunch 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

8 years, 6 months

[Aspuru-Guzik group list] Fwd: Excitonics Speaker Schedule- Tamar Seideman - NOV 3

by Marlon Cummings

Ultrafast Nanoplasmonics: Toward Coherently Controlled Chemistry at the Time-space Limit November 3, 2015 at 4:30 PM/ RLE Haus 36-428 *Tamar Seideman* *Department of Chemistry, Northwestern University, Illinois* [image: seideman] Electronics has long reached the molecular scale; not only do single-molecule junctions exhibit interesting conduction behaviors that have no analog in macroscopic electronics, they can also be tailored to induce a variety of fascinating dynamical processes in the molecular moiety, with potential applications ranging from new forms of molecular machines and new modes of conduction, to new directions in surface nanochemistry and nanolithography. Nevertheless, the application of light to control molecular motions and electronic transport in junctions may offer advantages, since photonic (by contrast to electronic) sources allow (sub)femtosecond time resolution and tunable phase and polarization properties. One of several challenges, however, is the requirement of coherent light sources that are tightly localized in space. It is here that plasmonics offer an opportunity. In the talk, I will combine plasmonics physics with concepts and tools borrowed from coherent, strong field control of molecular dynamics with two goals in mind. One is to introduce new function into nanoplasmonics, including ultrafast elements and broken symmetry elements. The second is to develop coherent nanoscale sources and apply them to control both mechanical motions and electric transport in the nanoscale. Focusing on the combination with molecules, I will discuss ongoing research on plasmon-exciton interactions in the strong coupling limit. To conclude the talk, I will return to nanoelectronics, and illustrate the application of plasmonics to control of transport in the nanoscale, with a view to ultrafast electric switches. *Tamar Seideman* is a Dow Chemical Company Professor in Chemistry and a Professor of Physics at Northwestern University. She received a B.Sc. degree (summa cum laude) in 1982 from the Tel-Aviv University, a M.Sc. (summa cum laude) in 1985 from the Weizmann Institute of Science, and a Ph.D. (summa cum laude) in 1990 from the Weizmann Institute of Science. She is a member of the National Academy of Science of Germany, a Fellow of the American Physical Society, a Guggenheim Fellow, a Member of the Willard Gibbs Award Jury, (elected July 2013), a member at large of the Division of the Atomic, Molecular and Optical Physics of the APS, and a member of the Atomic and Molecular Physics Committee of the National Academies. Her research was recognized with numerous international awards and honors, including a Wetson Award (2015-2018), a Mildred Dresselhaus Award for Senior Scientists (2013 first recipient), a Sackelr Award (2011), a senior A. von Humboldt Award (2004-2009), a Weston Award (2007-2009), an Emerson Award (1996-1997), a Wegner Award (1996), a Brener award, a J.F. Kennedy award, a Fulbright Research Award, a Chaim Weizmann Fellowship, the Knesset of Israel Award Prize, a Galilei Distinguished Lecturer Award, and a Windsor Distinguished Lecturer Award. She is the author of 245 refereed publications. Among Seideman’s research interests are quantum transport, current-driven nanochemistry and molecular machines; ultrafast nanoplasmonics and information guidance in the nanoscale; approaches to solar energy conversion; coherent control and coherence spectroscopies in isolated molecules and in dissipative media; attosecond science and the interaction of matter with intense laser fields; photomanipulation of external and internal molecular modes; and mathematical method development.

8 years, 6 months

[Aspuru-Guzik group list] FW: Excitonics Perovskite Seminar: Matt Klug -TOMORROW- Oct 27 - noon in 36-462

by Catherine M Bourgeois

8 years, 6 months

[Aspuru-Guzik group list] [qip] Ashley Montanaro is visiting us this week

by Cyril Stark

Hi Everybody, Ashley Montanaro from the University of Bristol is visiting us this week. On Friday, Ashley is giving the qip seminar. Please find details below, and please let me know if you want to schedule a meeting Best, cyril Speaker: Ashley Montanaro (University of Bristol) Title: Quantum walk speedup of backtracking algorithms Place: 6C-442 Time: 1:30 (October 30) Abstract: In this talk I will discuss a general method to obtain quantum speedups of classical algorithms which are based on the technique of backtracking, a standard approach for solving constraint satisfaction problems (CSPs). Backtracking algorithms explore a tree whose vertices are partial solutions to a CSP in an attempt to find a complete solution. Assume there is a classical backtracking algorithm which finds a solution to a CSP on n variables, or outputs that none exists, and whose corresponding tree contains T vertices, each vertex corresponding to a test of a partial solution. I will present a bounded-error quantum algorithm which completes the same task using O(sqrt(T) n^(3/2) log n) tests. In particular, this quantum algorithm can be used to speed up the DPLL algorithm, which is the basis of many of the most efficient SAT solvers used in practice. The quantum algorithm is based on the use of a quantum walk algorithm of Belovs to search in the backtracking tree. I will also discuss how, for certain distributions on the inputs, the algorithm can lead to an average-case exponential speedup. -- Cyril Stark Center for Theoretical Physics Massachusetts Institute of Technology 77 Massachusetts Ave, 6-304 Cambridge, MA 02139, USA _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

8 years, 6 months

[Aspuru-Guzik group list] Fwd: postdocs available at MIT

by Alan Aspuru-Guzik

---------- Forwarded message ---------- From: *William H Green* <whgreen(a)mit.edu> Date: Monday, October 26, 2015 Subject: postdocs available at MIT To: "alan(a)aspuru.com" <alan(a)aspuru.com> Dear Alan, I have several postdoctoral positions available in my research group, on a wide variety of projects. If you know of anyone suitable who might be interested, please ask them to contact me. Thanks, Bill William H. Green Hoyt C. Hottel Professor MIT Dept. of Chem. Eng. -- 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

8 years, 6 months

[Aspuru-Guzik group list] October 28, 2015-Prof. Eric Akkermans-HQOC/ITAMP Joint Quantum Sciences Seminar

by Ploucha, Clare

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, October 28 , 2015 4:00 PM, Jefferson 250 Prof. Eric Akkermans, Technion "Topology and fractals: measuring Chern numbers with waves in quasicrystals" I will present recent results obtained both theoretically and experimentally on fractal spectral properties of a polariton gas in Fibonacci quasi-periodic potential. The observed spectrum is accurately reproduced from a theoretical model that we shall present. We have observed for the first time log-periodic oscillations and the opening of mini-gaps following the gap labeling theorem and the corresponding topological Chern numbers. These results illustrate the potential of cavity polarities as a quantum simulator in complex topological geometries. Student Presenter: Soonwon Choi (Lukin group) Student Presentation from 4:00-4:10 PM Refreshments Served from 4:10-4:30 PM Guest Presentation from 4:30-6:00 PM -- Clare Ploucha Faculty Assistant to Professors Lukin & Greiner and their labs Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544

8 years, 6 months

[Aspuru-Guzik group list] [qip] Seminar - Michael Walter (tomorrow)

by Cyril Stark

Hi Everybody, This week’s qip seminar is given by Michael Walter from Stanford University. Here are the details: Speaker: Michael Walter (Stanford University) Title: Random tensor networks as models of holography Place: 6C-442 Time: 1:30 (October 23) Hope to see you tomorrow, cyril -- Cyril Stark Center for Theoretical Physics Massachusetts Institute of Technology 77 Massachusetts Ave, 6-304 Cambridge, MA 02139, USA _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

8 years, 6 months

[Aspuru-Guzik group list] [qip] Friday the 23

by Edward Farhi

Hi Quanta We will meet on Friday the 23rd at 11:00 in 6-310. We will be joined by Michael Walter who will also be speaking at 1:30 in our QI seminar. See you there! 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

8 years, 6 months

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aspuru-list October 2015