aspuru-list November 2017

aspuru-list@lists.fas.harvard.edu

23 participants
58 discussions

[Aspuru-Guzik Group List] Second rehearsal

by Gelbwaser, David

Hi Everyone, Thanks very much for your comments on my presentation. I will do a second rehearsal on Saturday at 11 at the division room. I will appreciate anyone who could come to give me feedback. Probably, I will do a third rehearsal on Sunday at the same time and same place, and I am looking for volunteers for that day too. Thanks David

6 years, 5 months

[Aspuru-Guzik Group List] Excitonics/Perovskite Seminar, TODAY, Nov 17 at 12 noon: 34-401B

by Catherine M Bourgeois

Center for Excitonics/Perovskite Seminar Series presents: How to assess operational stability of perovskite solar cells with reversible degradation?* November 17, 2017 at 12 noon/ rm: 34-401B Eugene Katz Ben-Gurion University of the Negev, Israel/ Department for Solar Energy and Environmental Physics [http://www.rle.mit.edu/excitonics/wp-content/uploads/2016/12/katz..jpg] Development of hybrid organic-inorganic halide perovskite solar cells (PSCs) combining high performance and operational stability is a key issue for implementation of this technology. Both reversible improvement and reversible degradation of PSC efficiency were previously reported under illumination-darkness cycling. Quantifying the performance and stability of cells exhibiting significant diurnal performance variation is challenging and requires specific protocols. In this talk I will discuss outdoor stability measurements of two types of devices showing either reversible photo-degradation or pronounced reversible efficiency improvement under sunlight-soaking. Analysis of the results suggests that the figures of merit for photovoltaic performance and stability of such devices should be reconsidered. Instead of the classical approach of reporting the initial (or stabilized) efficiency value and estimation of T80, we propose to use the value of energy output generated during the first day of the exposure (or first illumination period in the light/darkness cycling indoor) and the time needed for reaching its 20% drop, respectively. The latter accounts for both the long-term irreversible degradation and the reversible diurnal efficiency variation and does not depend on the type of processes prevailing in a given perovskite cell. Possible underlying mechanisms for reversible, irreversible and apparently irreversable performance losses will be discussed on the basis of I-V curves evolution, transient electrical measurements and photoluminescence studies. Eugene A. Katz received his MSc degree in Semiconductor Materials Science in 1982 and Ph. D. in solid state physics in 1990 from the Moscow Institute of Steel and Alloys. He has research experience in field of photovoltaic materials and devices for more than 30 years. The topic of his Ph. D. thesis was "Atomic structure and electronic properties of grain boundaries in polycrystalline silicon solar cells". In 1995, he joined the Ben-Gurion University of the Negev and has been working in the Department for Solar Energy and Environmental Physics ever since (now as a full professor). His research interests include areas of applied solar energy, photovoltaics based on non-traditional semiconductors (fullerenes, nanotubes, conjugated polymers, perovskites), photovoltaic characterization of AIIIBV concentrator solar cells at ultra-high concentration of natural sunlight (up to 10,000 suns) and synthesis of nanomaterials by concentrated sunlight. He has published more than 100 peer-reviewed papers on these topics. In addition, has published a book and articles for broader audiences on the history of science and fullerene-like structures in nanomaterials, living organisms and architecture. *This talk is part of the Perovskites Seminar Series organized by Juan-Pablo Correa-Baena from MIT's PV Lab and sponsored by the Center for Excitonics. For more info contact Juan-Pablo: jpcorrea(a)mit.edu<mailto:jpcorrea@mit.edu> 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

6 years, 5 months

[Aspuru-Guzik Group List] FW: [Biophysics-Seminar] Ashwin Gopinath Monday 11/20 @3:00pm in Duboc Room 4-331

by Catherine M Bourgeois

FYI….. MIT Special Biophysics Seminar Monday, November 20 @3:00pm in Duboc Room 4-331 Ashwin Gopinath<http://caltech.academia.edu/AshwinGopinath> Caltech DNA origami: The bridge from bottom to top Conventional top-down nanofabrication, over the last six decades, has enabled almost all the complex electronic, optical and micro-fluidic devices that form the foundation of our society. Parallel efforts, exploring bottom-up self-assembly processes, have also enabled design and synthesis of structures like quantum dots, carbon nanotubes and unique bio-molecules that possess technologically relevant proper- ties unachievable top-down. While both these approaches have independently matured, ongoing efforts to create “hybrid nanostructures” combining both strategies, has been fraught with technical challenges. The main roadblock is the absence of a scalable method to deterministically organize components built bottom-up within top-down nanofabricated structures. In this talk, I will first introduce a directed self-assembly technique that utilizes DNA origami1 as a molecular adaptor to modularly position, and orient, bottom-up nano-components (like quantum dots, light emitters and proteins) within top-down nanofabricated devices.2 I will then present experimental results demonstrating the utility of the technique to achieved absolute, arbitrarily scalable, control over the integration of discrete emitters inside optical devices.3,4 Finally, I conclude by presenting my vision of how DNA origami assisted modular bridge between top-down and bottom-up nanofabrication can enable a range of highly transformative, functional, devices. Specifically, I will discuss unpublished data demonstrating arrays of single-photon sources, platform for studying bio-chemical networks with discrete components and designs for using this technology for real-time highly-multiplexed protein quantification. Host: Mark Bathe Please post the attached .pdf poster to advertise the talk _______________________________________________ biophysics-seminar mailing list biophysics-seminar(a)mit.edu<mailto:biophysics-seminar@mit.edu> http://mailman.mit.edu/mailman/listinfo/biophysics-seminar

6 years, 5 months

[Aspuru-Guzik Group List] [qip] Stephen Jordan talk at noon Friday; short group meeting

by Peter Shor

Because of the Stephen Jordan talk at noon, we'll cut the group meeting short. Anybody who wants to can show up at 11:00, and we'll stop by 11:30 so people can head over to Harvard. Usual place (6-310). Nobody is scheduled to talk, but we can discuss the QIP 2018 accepted papers. Peter ---------- Forwarded message ---------- Date: Thu, 16 Nov 2017 16:21:30 -0500 From: "Romero Fontalvo, Jhonathan" <jromerofontalvo(a)g.harvard.edu> To: shor(a)math.mit.edu Subject: Talk by Dr. Stephen Jordan TOMORROW Dear Prof. Shor, Tomorrow we will have a talk by Stephen Jordan hosted by the Aspuru-Guzik group. Please share this info with the qip list. Cheers, Jhonathan. Quantum algorithms for quantum and classical field theories _________________________________________ TOMORROW, November 17th, Noon - 1:30pm Division Room, CCB Department, 12 Oxford Street, Cambridge, MA Lunch will be served. _________________________________________ Dr. Stephen Jordan National Institute of Standards and Technology (NIST) and Joint Center for Quantum Information and Computer Science (QuICS) University of Maryland Many physical problems in areas both foundational, such as particle physics, and practical, such as mechanical and electrical engineering, are fundamentally phrased in terms of fields that vary continuously in space. In this talk, I will describe quantum algorithms for simulating the dynamics of both quantum and classical fields and discuss applications to physics and engineering. No prior knowledge of quantum field theory will be assumed. -- Jonathan Romero FontalvoPh.D. Student in Chemical Physics Harvard University Website: https://sites.google.com/site/jonathanromeroswebsite/ _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

6 years, 5 months

[Aspuru-Guzik Group List] Talk by Postdoc candidate - Matthias Degroote (TOMORROW, 2pm, DR)

by Romero Fontalvo, Jhonathan

Hi everyone, Tomorrow we will have the visit of Matthias Degroote, postdoc candidate for the quantum subgroup. He has a quantum chemistry background. Matthias will be presenting his talk at 2 pm in the Division Room. See the abstract of his talk and his CV attached. I am also sending his schedule. If anyone else is interested in talking to him, please let me know, we might arrange some time after 4 pm. Cheers, Jhonathan. -- Jonathan Romero Fontalvo *Ph.D. Student in Chemical Physics* *Harvard University* Website: https://sites.google.com/site/jonathanromeroswebsite/

6 years, 5 months

[Aspuru-Guzik Group List] Group meeting, Thu Nov 16, 3:30 PM, Div Room

by Ian Kivlichan

Hi all, Tomorrow David will talk at group meeting. Title and abstract to follow later. All the best, Ian

6 years, 5 months

[Aspuru-Guzik Group List] Excitonics/Perovskite Seminar, TOMORROW, Nov 17 at 12 noon

by Catherine M Bourgeois

Center for Excitonics/Perovskite Seminar Series presents: How to assess operational stability of perovskite solar cells with reversible degradation? November 17, 2017 at 12 noon/ rm: 34-401B Eugene Katz Ben-Gurion University of the Negev, Israel/ Department for Solar Energy and Environmental Physics [http://www.rle.mit.edu/excitonics/wp-content/uploads/2016/12/katz..jpg] Development of hybrid organic-inorganic halide perovskite solar cells (PSCs) combining high performance and operational stability is a key issue for implementation of this technology. Both reversible improvement and reversible degradation of PSC efficiency were previously reported under illumination-darkness cycling. Quantifying the performance and stability of cells exhibiting significant diurnal performance variation is challenging and requires specific protocols. In this talk I will discuss outdoor stability measurements of two types of devices showing either reversible photo-degradation or pronounced reversible efficiency improvement under sunlight-soaking. Analysis of the results suggests that the figures of merit for photovoltaic performance and stability of such devices should be reconsidered. Instead of the classical approach of reporting the initial (or stabilized) efficiency value and estimation of T80, we propose to use the value of energy output generated during the first day of the exposure (or first illumination period in the light/darkness cycling indoor) and the time needed for reaching its 20% drop, respectively. The latter accounts for both the long-term irreversible degradation and the reversible diurnal efficiency variation and does not depend on the type of processes prevailing in a given perovskite cell. Possible underlying mechanisms for reversible, irreversible and apparently irreversable performance losses will be discussed on the basis of I-V curves evolution, transient electrical measurements and photoluminescence studies. Eugene A. Katz received his MSc degree in Semiconductor Materials Science in 1982 and Ph. D. in solid state physics in 1990 from the Moscow Institute of Steel and Alloys. He has research experience in field of photovoltaic materials and devices for more than 30 years. The topic of his Ph. D. thesis was "Atomic structure and electronic properties of grain boundaries in polycrystalline silicon solar cells". In 1995, he joined the Ben-Gurion University of the Negev and has been working in the Department for Solar Energy and Environmental Physics ever since (now as a full professor). His research interests include areas of applied solar energy, photovoltaics based on non-traditional semiconductors (fullerenes, nanotubes, conjugated polymers, perovskites), photovoltaic characterization of AIIIBV concentrator solar cells at ultra-high concentration of natural sunlight (up to 10,000 suns) and synthesis of nanomaterials by concentrated sunlight. He has published more than 100 peer-reviewed papers on these topics. In addition, has published a book and articles for broader audiences on the history of science and fullerene-like structures in nanomaterials, living organisms and architecture. 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

6 years, 5 months

[Aspuru-Guzik Group List] TODAY - ITAMP/HQOC Joint Quantum Science Seminar - Wednesday, November 15th at 4:00

by Dakoulas, Samantha R

ITAMP/HQOC Joint Quantum Sciences Seminar Wednesday, November 15, 2017 4:00 PM, Jefferson 250 Prof. Tongcang Li, Purdue University “Levitated spin-optomechanics” Optomechanical systems, such as the Laser Interferometer Gravitational-‐Wave Observatory (LIGO) and atomic force microscopes, are very sensitive devices. Among different optomechanical systems, an optically levitated nanoparticle in vacuum can have a particularly high quality factor. In this talk, I will discuss how to couple the mechanical motion of an optically levitated nanoparticle to photon spins, electron spins, and the spin angular momentum of quantum vacuum fluctuations for sensing, quantum information science, and macroscopic quantum mechanics. Recently, we optically levitated a nanodiamond and demonstrated electron spin control of its built-‐in nitrogen-‐vacancy (NV) centers in vacuum. We have also driven a nanoparticle to rotate beyond 1GHz with a circularly polarized laser beam, and observed the torsional vibration of a nanoparticle with a linearly polarized laser beam. Based on our experimental results, we propose to achieve strong coupling between an NV electron spin and the torsional vibration of a levitated nanodiamond with a uniform magnetic field. We also propose to use our system to detect the Casimir torque due to angular momentum of quantum vacuum fluctuations, which has not been observed to date. At the end of the talk, I will briefly describe my other works in quantum optics. Student Presentation by Noah Rubin will begin at 4:00 Guest Presentation will begin at 4:30 PM Refreshments will be provided. Samantha Dakoulas Faculty Assistant to Professors Lukin & Greiner & their groups Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544

6 years, 5 months

[Aspuru-Guzik Group List] ITAMP/HQOC Joint Quantum Science Seminar - Wednesday, November 15th at 4:00

by Dakoulas, Samantha R

6 years, 5 months

[Aspuru-Guzik Group List] [qip] QIP special seminar correction ... Monday, Nov. 20

by Peter Shor

I got the date wrong. The date is Monday, November 20. Many apologies. Beth Ruskai will be giving a seminar on Monday, Nov. 20 at 4pm. Details follow. -------- Speaker: Mary Beth Ruskai Title: Using local additivity to find examples of superadditivity of quantum channels. Room: 6C-442, MIT. Time: 4pm, Monday November 20. Abstract: The local additivity of minimal output entropy can be extended to local additivity of maximal relative entropy with respect to a fixed reference state. This can be exploited to test channels for superadditivity of Holevo capacity with numerical effort comparable to searching for the minimal output entropy. Local maxima which do not arise from product inputs play a key role. Moreover, evidence of superadditivity can be found even if the additivity violation itself is too small to be seen numerically. This talk will be divided into two parts. First we sketch the Gour-Friedland proof of local additivity with several significant simplifications. Second, we describe a program to test 3-state qubit channels for superadditivity of the Holevo capacity. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

6 years, 5 months

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aspuru-list November 2017