aspuru-list May 2009

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[Aspuru-Guzik group list] TODAY: Excitonics Seminar - Professor Russell J. Holmes - May 20

by rtavilla＠rle.mit.edu

Center for Excitonics Seminar Series Announcement The Center for Excitonics (http://www.rle.mit.edu/excitonics) invites you to join us at the next and final seminar of the Spring 2009 series. Please forward this information on to others who might be interested in attending this seminar. Title: Overcoming the Exciton Diffusion Bottleneck in Organic Photovoltaic Cells Presenter: Professor Russell J. Holmes Organization: Department of Chemical Engineering and Materials Science Date: May 20, 2009 Time: 3:00 - 4:00pm Place: W20-407 Refreshments: Yes URL: http://www.rle.mit.edu/excitonics/holmes-052009.html abstract Organic materials are attractive for application in photovoltaic cells due to their compatibility with lightweight, flexible substrates, and high throughput processing techniques. Optical absorption in these materials leads to the creation of a bound electron-hole pair known as an exciton. The exciton is mobile, and diffuses to a heterojunction where electron-hole separation and photocurrent generation may take place. In most organic materials, the exciton diffusion length is much shorter than the optical absorption length. This “exciton bottleneck” limits the active layer thickness and reduces cell absorption efficiency. Routes around the bottleneck have centered on the use of mixed donor-acceptor film morphologies to increase the area of the dissociating interface. While promising, these architectures are difficult to optimize, and can introduce resistance for the collection of photogenerated carriers. This talk will examine two alternate techniques to overcome the exciton bottleneck. First, the use of energy transfer to a long-lived phosphorescent sensitizer will be described as a means to enhance the exciton diffusion length in fluorescent, electron donating materials. A second approach involving the use of donor-acceptor films with engineered film composition and morphology will be discussed as a means to simultaneously maximize the exciton diffusion and charge collection efficiencies. bio Russell Holmes is an Assistant Professor in the Department of Chemical Engineering and Materials Science at the University of Minnesota. He completed his M.A. and Ph.D. in Electrical Engineering at Princeton University, and holds a B.Sc. (Honours) in Physics from the University of Manitoba, Canada. Prof. Holmes’ research is focused on the fundamental optoelectronic properties of organic and hybrid materials, and their application in organic light-emitting devices, photovoltaic cells, and lasers.

14 years, 11 months

[Aspuru-Guzik group list] article of interest

by Alejandro Perdomo

In case some of the quantum computing crowd have not seen this article yet. http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN… Phys. Rev. A *79*, 042335 (2009) [9 pages]Efficient quantum algorithm for preparing molecular-system-like states on a quantum computer-A -- Alejandro Perdomo Ph.D. Candidate in Chemical Physics. Harvard University 12 Oxford St #482, Cambridge, MA, 02138. perdomo(a)fas.harvard.edu

14 years, 11 months

[Aspuru-Guzik group list] Fwd: Solicitation of nominees for PChem seminar speakers next year

by Anna B. Shin

---------- Forwarded message ---------- From: Adam Cohen <cohen(a)chemistry.harvard.edu> Date: Tue, May 19, 2009 at 12:46 AM Subject: Solicitation of nominees for PChem seminar speakers next year To: Margaret Owens <owens(a)seas.harvard.edu>, Joyce Eather < joyce(a)huarp.harvard.edu>, "Anna B. Shin" <anna(a)chemistry.harvard.edu>, Jeffrey Fosdick <Fosdick(a)chemistry.harvard.edu>, Teresa Hernandez < thernand(a)seas.harvard.edu>, Marie Purcell <purcell(a)chemistry.harvard.edu>, Judy Morrison <morrison(a)chemistry.harvard.edu>, Kathleen Ledyard < kathleen(a)cmliris.harvard.edu>, Jeff Creson <creson(a)chemistry.harvard.edu>, TJ Martin <tjmartin(a)gmwgroup.harvard.edu>, Teri Howard < howard(a)chemistry.harvard.edu>, Matthew Kilroy <kilroy(a)chemistry.harvard.edu>, Marci Karplus <marci(a)tammy.harvard.edu> Cc: Helen Schwickrath <schwickrath(a)chemistry.harvard.edu> Dear PChem Lab Administrators, Can you please pass on this announcement to students and postdocs in your group? Thanks! Best wishes, Adam Dear All, I'm soliciting nominations for PChem seminar speakers for next year. Please send me suggestions! For each nominee, please email me the following information: Name University Email address Please send me this email by 8pm on Weds. May 20. Thank you! Best wishes, Adam -- Adam E. Cohen Depts. of Chemistry and Chemical Biology and of Physics Harvard University 617-496-9466 (office) 646-258-9068 (cell) www.fas.harvard.edu/~aecohen -- Anna B. Shin Aspuru-Guzik Group Administrator Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617.496.9964 phone 617.496.9411 fax Aspuru-Guzik Group URL: http://aspuru.chem.harvard.edu/

14 years, 11 months

[Aspuru-Guzik group list] Excitonics Seminar - Professor Russell J. Holmes - May 20

by rtavilla＠rle.mit.edu

14 years, 11 months

[Aspuru-Guzik group list] Kurt Jacobs

by Alan Aspuru-Guzik

Dear Group, FYI about Kurt Jacob's visit on Tuesday. Alan Alán Aspuru-Guzik | Assistant Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu ---------- Forwarded message ---------- From: Eric Heller <e.j.heller(a)mac.com> Date: Sat, May 16, 2009 at 9:36 PM Subject: Kurt Jacobs To: Group Group <hellergroup(a)googlegroups.com> Cc: Alan Aspuru-Guzik <alan(a)aspuru.com> On tuesday we will hear from a colleague at UMass Boston, Kurt Jacobs, in a joint group meeting with the Aspuru-Guzik group. See http://www.quantum.umb.edu/Jacobs/ Our meeting is at 4 in the Division room. Come by at noon to my office if you want to join in our discussion. A great guy to know! Rick

14 years, 11 months

[Aspuru-Guzik group list] group meeting today: 11am in Mallinkrodt102

by Alejandro Perdomo

Dear group,Today we will have as a special guest Stephen Jordan, who is visiting from Caltech. -A -- Alejandro Perdomo Ph.D. Candidate in Chemical Physics. Harvard University 12 Oxford St #482, Cambridge, MA, 02138. perdomo(a)fas.harvard.edu

14 years, 11 months

[Aspuru-Guzik group list] Fwd: Kurt Jacobs' seminar next Tuesday 5/19

by Anna B. Shin

Dear Group, Prof. Kurt Jacobs will be giving a talk next Tue 19 May at 4pm in the Div Rm. His title and abstract are below. Thanks, Anna ---------- Forwarded message ---------- From: Judy Morrison <morrison(a)chemistry.harvard.edu> Date: Thu, May 14, 2009 at 4:26 PM Subject: Kurt Jacobs' seminar next Tuesday 5/19 To: anna(a)chemistry.harvard.edu Cc: aspuru(a)fas.harvard.edu Hi Anna, Would you please let the Aspuru-Guzik Group know about the seminar arranged by Rick and Alan for next Tuesday (details below)? I’ll be on vacation next week, so just to confirm that as we discussed earlier, Kurt’s schedule will be: *Kurt Jacobs’ schedule, Tues. 5/19* 12 noon meet with Rick (and possibly other group members) 1 p.m. lunch with Rick and Alan 2:30 p.m. meet with Alan (and possibly other group members) 4 p.m. Kurt’s talk in the Division Room *Title:* Using Quantum Back-Action for Engineering States and Controlling Systems *Abstract:* We present two ways in which the back-action of quantum measurements can be sued to control quantum systems. In the first we show that a mesoscopic resonator can be prepared in a Schrödinger-Cat state merely by continuous observation. In the second we show that finite quantum systems can be accurately controlled purely by random quantum back-action. This is made possible by the creation of diffusion gradients. *SPECIAL SEMINAR* *Professor Kurt Jacobs* UMass Boston** * * *Using Quantum Back-Action for Engineering States and Controlling Systems* *Tuesday, May 19, 2009* *4:00 p.m. * * * *Cabot Division Room, Mallinckrodt 102* * * * * Best wishes, Judy Judy Morrison Assistant to Professors Eugene Shakhnovch and Eric Heller Department of Chemistry and Chemical Biology Harvard University 12 Oxford. St., M-108 Cambridge, MA 02138 phone: (617) 495-8733 fax: (617) 384-9228 email: morrison(a)chemistry.harvard.edu -- Anna B. Shin Aspuru-Guzik Group Administrator Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617.496.9964 phone 617.496.9411 fax Aspuru-Guzik Group URL: http://aspuru.chem.harvard.edu/

14 years, 11 months

[Aspuru-Guzik group list] HUCE Weekly Calendar Update May 14 - 28

by Center for the Environment

Highlights: Saturday, May 16: Take a walking tour Harvard Yard with experts from the Harvard Herbaria and learn about the natural history of Harvard's arboreal treasures. Tuesday, May 19: Yongzhen Yu, a visiting scholar of the Energy Technology Innovation Policy Program at the Harvard Kennedy School, discusses how Demand Side Management (DSM) is one of the best and most practical policy tools for China to balance environmental protection and economic growth. Thursday, May 21: A Boston University conference looks at how solutions to sustainable energy management, combining new cyber infrastructure with technological breakthroughs like wind generation or electric hybrid vehicles, may mean pulling the plug on how things are done today. Calendar Listings: Today 5/14/2009 3:30p China Project Seminar (Pierce Hall 100F, 19 Oxford St., Cambridge, MA) "Environmental Complaints in China 1992-2006: A Provincial-Level Analysis." Dr. Martin Dimitrov, Assistant Professor, Department of Government, Dartmouth College. Contact: Chris Nielsen , nielsen2(a)fas.harvard.edu 6:00p Microbial Sciences Initiative Thursday Evening Seminar Series (HUCE Seminar Room, 24 Oxford St., 3rd Floor, Cambridge, MA) "Managing the Mutant Microbe Within: Mitochondrial-nuclear epistasis for fitness and disease in Drosophila." David Rand, Brown University Professor of Biology. Contact: Christy Herren, herren(a)fas.harvard.edu, (617) 495 8643, www.msi.harvard.edu/thursdays.html 7:00p Reaching Sustainability in the Existing Built Environment (First Parish Church, 3 Church St., Cambridge) An exchange of ideas on how we can reach true energy efficiency in our built environment. Contact: info(a)basea.org, www.basea.org Friday 5/15/2009 11:00a Harvard Forest Seminar Series (Seminar Room at Shaler Hall, Harvard Forest, 324 North Main Street, Petersham, MA) "Ecosystem-level experiments in Coweeta-LTER streams: lessons learned." Sue Eggert, USDA Forest Service. Contact: Audry Barker Plotkin, aabarker(a)fas.harvard.edu 4:00p EPS Special Lecture Series (Hoffman Faculty Lounge, 4th Floor, 20 Oxford St., Cambridge, MA) "Perspectives on melt transport and formation of the Earth's crust." Peter Kelemen, Columbia University. Talk 3: Evolving ideas about subduction zone magmatism. Contact: Rady Rogers, rady(a)eps.harvard.edu Saturday 5/16/2009 10:00a - 2:00p Somerville Living Green Festival (Somerville High School, 81 Highland Ave., Somerville, MA) Step up your sustainability through amazing hands-on workshops and demonstrations: healthy cooking, bike repair, home gardening, insulation, and more. Contact: www.somervilleclimateaction.org/web/lgf 11:00a HMNH Special Event: Walking Tour of the Trees of Harvard (Harvard Museum of Natural History, 26 Oxford Street, Cambridge, MA) Take a walk around Harvard Yard with experts from the Harvard Herbaria and learn about the natural history of Harvard's arboreal treasures. Contact: hmnh-lectures(a)oeb.harvard.edu, 617.384.8309 Sunday 5/17/2009 2:00p Harvard Museum of Natural History Family Program (HMNH, 26 Oxford St., Cambridge, MA) "Under New England: The Story of New England’s Rocks and Fossils." Charles Ferguson Barker. Contact: hmnh(a)oeb.harvard.edu, www.hmnh.harvard.edu/family_programs/... Monday 5/18/2009 11:30a Harvard Energy Journal Club (HUCE Seminar room, 24 Oxford St. 3rd floor, Cambridge, MA) Visit the Energy Journal website for current topics of discussion. Contact: Mark Winkler, mwinkler(a)fas.harvard.edu, www.hcs.harvard.edu/hejc/ 4:00p EPS Special Lecture Series (Haller Hall, Geological Museum, 24 Oxford St., Cambridge, MA) "Perspectives on melt transport and formation of the Earth's crust." Peter Kelemen, Columbia University. Talk 4: Recipes for cratonic upper mantle and continental crust Contact: Rady Rogers, rady(a)eps.harvard.edu Tuesday 5/19/2009 9:00a - 5:00p Alternative Energy and Building Efficency '09: Conference and Exhibition (Hynes Convention Center, 900 Boylston St., Boston, MA) Alternative Energy and Building Efficiency '09 is the event of the year for all building, architecture, design, facilities management, and energy management professionals. Contact: Ken Cardelle, kcardelle(a)AlternativeEnergyShows.com, 860-707-2770, www.AlternativeEnergyShows.com 9:30a - 11:00a Energy Technology Innovation Policy Seminar Series (Belfer Center Library, Littauer 369, 79 JFK St., Harvard Kennedy School, Cambridge, MA) "Policy Redesign Recommendations for Solving Financial Bottlenecks in Demand Side Management Activities in China." Yongzhen Yu, ETIP Visiting Scholar. Contact: (617) 496-5584, www.belfercenter.org/energy 9:30a - 10:30a Molecular and Integrative Physiological Sciences Seminar (HSPH Bldg I, Room 1302, Boston, MA ) "Carbon Nanotubes: From Structure to Biological and Toxicokinetic Function." Kostas Kostarelos, PhDChair of Nanomedicine and Head, Centre for Drug Delivery Research School of Pharmacy, University of London. Contact: macurran(a)hsph.harvard.edu 6:00p - 9:00p Is there an Answer to the Energy Crisis? (Fairmont Battery Wharf Hotel, Three Battery Wharf, Boston, MA) Join four captivating thinkers - a scientist, an artist, a writer, and a professor - for a night of cocktails and conversation about the future energy grid. Contact: events(a)seedmediagroup.com 6:00p - 7:30p MIT Museum Soap Box Series: Energy (MIT Museum, N51, 265 Massachusetts Ave., Cambridge, MA) "Luminescent Solar Concentrators Explained." Marc Baldo, Esther and Harold E. Edgerton Associate Professor of Electrical Engineering, Department of Electrical Engineering and Computer Science, MIT. Contact: museuminfo(a)mit.edu, mit.edu/museum/programs/soapbox.html Wednesday 5/20/2009 9:00a - 5:00p Alternative Energy and Building Efficency '09: Conference and Exhibition (Hynes Convention Center, 900 Boylston St., Boston, MA) Alternative Energy and Building Efficiency '09 is the event of the year for all building, architecture, design, facilities management, and energy management professionals. Contact: Ken Cardelle, kcardelle(a)AlternativeEnergyShows.com, 860-707-2770, www.AlternativeEnergyShows.com 1:30p Solid Earth Physics Seminar Series (Hoffman Faculty Lounge, 4th Floor, 20 Oxford St., Cambridge, MA) "A Probabilistic Description of Tsunami Phenomenology." Eric Geist, U.S. Geological Survey, Menlo Park, California. Contact: esag.harvard.edu/rice/SOLID.EARTH.SEM... Thursday 5/21/2009 9:00a - 5:00p Disrupting the Status Quo in Electric Energy Management: A Systems Approach to a Sustainable Energy Future (Boston University, 8 St. Mary's Street, Brookline, MA) As public interest in sustainable energy management continues to grow, our objective is to provide a forum for industry and academia to explore critical aspects of technology advancement and market growth. Contact: Elizabeth Flagg, se(a)bu.edu , 617.358.0351 , www.bu.edu/systems/news/special-05210... Friday 5/22/2009 11:00a Harvard Forest Seminar Series (Seminar Room at Shaler Hall, Harvard Forest, 324 North Main Street, Petersham, MA) "Dynamics of the woody component in Neotropical seasonal savannas: some ecophysiological aspects." Carlos Garcia, Universidad de Los Andes (Venezuela) and Harvard Bullard Fellow. Contact: Audry Barker Plotkin, aabarker(a)fas.harvard.edu Wednesday 5/27/2009 6:00p - 9:00p Earth Night: A Benefit for the Environmental League of MA (Omni Parker House, 60 School St., Boston, MA) George Bachrach, ELM President, invites you to Earth Night featuring U.S. Congressman Ed Markey, Chairman of the House Select Committee on Energy Independence and Global Warming. Contact: info(a)classic-communications.com, 508.698.6810, www.EarthNight.org ---- Always check the calendar on the website for updated information. If you would like to submit an event to the calendar, contact Lisa Matthews at the Center for the Environment: lisa_matthews(a)harvard.edu. Feel free to distribute this email to your students, faculty, colleagues, and anyone else who may be interested in environmental events around the community. ============================================== You are receiving this email because you indicated interest in Harvard University Center for the Environment events. Unsubscribe aspuru-list(a)lists.fas.harvard.edu from this list: http://harvard.list-manage.com/unsubscribe?u=7532d1fbf18f39219ac742ebe&id=5… Our mailing address is: Harvard University Center for the Environment 24 Oxford St. 3rd floor Cambridge, MA 02138 Our telephone: (617) 495-0368 Forward this email to a friend: http://forward-to-friend.com/forward?u=7532d1fbf18f39219ac742ebe&id=5161bcc… Update your profile: http://harvard.list-manage.com/profile?u=7532d1fbf18f39219ac742ebe&id=5bea9…

14 years, 11 months

[Aspuru-Guzik group list] vendor system

by Anna B. Shin

Dear Group, I am running into discrepancies within the online system that creates reimbursements. Some of your addresses have been deactivated or don't exist anymore. I need the following information from everyone so I can check your vendor set-up in the system. If I do this preemptive action, it may minimize delays in reimbursement. If you are a *grad student*: 1) What is your local home address? 2) What is your permanent address? For foreign nationals, they want an international address please. For all students, they will not allow your reimbursement checks to be sent to your campus address at 12 Oxford Street. They will only send it to your local home address now. If you are a *postdoc*, please answer these questions: 1) What is your CCB mailbox number? 2) What is your local home address? 3) What is your permanent address? Again, for foreign nationals, they want an international address. 4) Do you have direct deposit? Depending on your postdoc appointment (most fellowship recipients have non-employee status), you may or may not be allowed to have direct deposit or checks sent to your campus address. If you are not considered a HU employee, your checks will be sent to your local home address (no exceptions). Thanks for your prompt response. Anna -- Anna B. Shin Aspuru-Guzik Group Administrator Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617.496.9964 phone 617.496.9411 fax Aspuru-Guzik Group URL: http://aspuru.chem.harvard.edu/

14 years, 11 months

[Aspuru-Guzik group list] Fwd: talk

by Anna B. Shin

Dear Group, Mike's student is presenting a talk tomorrow morning. See details below: Center for Nanoscale Systems Special Seminar *High Charge Sensitivity With a Quantum Dot As a Charge Sensor:* *Experimental, Numerical and Theoretical Results* * * *THURSDAY, MAY 14th* *11:00 a.m.* *LISE 303* * * *Morten Kjærgaard* *Niels Bohr Institute* We theoretically analyze recent experiments by the Marcus group which study the relative sensitivity of charge sensors, or “listeners,” made from quantum point contacts (QPCs) on the one hand, or sensor quantum dots (SQDs) on the other hand. The listeners are now regularly employed in multiple quantum dot systems such as, for example, double quantum dots. In that case, the transition of the charge state from an electron on each dot (1,1) to two electrons on one dot and zero electrons on the other dot (0,2) is of central importance for various experiments in coherent electron manipulation. In the case of the conventional nearby QPC listener, measurements show a conductance change of order a few percent when the double dot changes state. By contrast, a conductance change of order 200 % have been observed when the listener is itself a quantum dot, with a few electrons, operated in the Coulomb blockade regime. The dramatic difference occurs despite that fact that the two plunger gates controlling the QPC and the SQD are roughly equal in size and have comparable “lever arms” to the two dimensional electron gas. We simulate the experimental device by performing self-consistent electronic structure calculations of the device, in the effective mass, local density approximation to density functional theory. A master equation is employed to compute the conductance through the Coulomb blockaded SQD and a simple WKB approximation is used with the evolving QPC potential profile to determine the conductance through the QPC. The numerical results, which substantially agree with experiment, are explained with an heuristic model of screening in the two systems (i.e. QPC and SQD). We show that the polarizability of the open QPC system screens either the gate or the effective gate (represented by the double dot charge state) and therefore significantly reduces the influence of the external potential. By contrast, the Coulomb blockaded SQD possesses a gap at the Fermi surface and its polarizability is consequently much reduced. A simple model employing capacitances is introduced to elucidate the physics. ---------- Forwarded message ---------- From: Michael Stopa <stopa(a)deas.harvard.edu> Date: Wed, May 13, 2009 at 3:19 PM Subject: talk To: "Anna B. Shin" <anna(a)chemistry.harvard.edu> Hi Anna, Could I trouble you to send this announcement of my student Morten's talk to the group ? It is tomorrow morning. Thanks, Mike -- Michael Stopa Director: National Nanotechnology Infrastructure Network Computation Project Center for Nanoscale Systems Harvard University 11 Oxford St. Cambridge, MA 02138 phone: 617-496-6932 -- Anna B. Shin Aspuru-Guzik Group Administrator Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617.496.9964 phone 617.496.9411 fax Aspuru-Guzik Group URL: http://aspuru.chem.harvard.edu/

14 years, 11 months

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aspuru-list May 2009