aspuru-list October 2013

aspuru-list@lists.fas.harvard.edu

34 participants
87 discussions

[Aspuru-Guzik group list] Candid opinion about postdoctoral candidate.

by Alan Aspuru-Guzik

Dear group members, As it is group tradition, please share with me your candid opinions about Dr. Jose Luis Mendoza-Cortes's visit. I am considering him for the Samsung position, as we as Rafael Gomez Bombarelli. If you have any comments about both, either, or a comparison let me know. I want to know the opinion of the group at large. Cheers, Alan 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

10 years, 6 months

[Aspuru-Guzik group list] Fwd: [SPS] Thursday: 10/24/13 MIT Physics Colloquium: David Griffiths (fwd)

by Jacob Sanders

Hi group! The author of one of our favorite quantum mechanics textbooks (and electromagnetism and particle physics books) will be giving a talk at MIT tomorrow. I personally am excited to get to finally see the guy in person! Just thought some of you other fellow textbook nerds might be interested! Jacob ---------- Forwarded message ---------- From: David Morin <djmorin(a)fas.harvard.edu> Date: Wed, Oct 23, 2013 at 10:27 PM Subject: [SPS] Thursday: 10/24/13 MIT Physics Colloquium: David Griffiths (fwd) To: sps-list(a)hcs.harvard.edu This should be a nice talk tomorrow, if you can make it down to MIT: -------------------------- *The David and Edith Harris Physics Colloquium Series* Thursday, 10/24/13 in room 10-250, 4:00 pm David Griffiths Reed College "Hidden Momentum" Electromagnetic fields carry energy, momentum, and even angular momentum. The momentum density is ε0(E×B), and it accounts (among other things) for the pressure of light. But even static fields can harbor momentum, and this would appear to contradict a general theorem: if the center of energy of a closed system is at rest, then its total momentum must be zero. Evidently in such cases there lurks some other momentum, not electromagnetic in nature, which cancels the field momentum. But finding this “hidden momentum” can be surprisingly subtle. I’ll discuss a particularly nice example. Time: 4:00pm Place: 10-250* *Refreshments at 3:30pm in 4-349 (Pappalardo Community Room) Physics Colloquia Schedule: http://web.mit.edu/physics/** events/colloquia.html <http://web.mit.edu/physics/events/colloquia.html> _______________________________________________ sps-list mailing list sps-list(a)lists.hcs.harvard.edu https://lists.hcs.harvard.edu/mailman/listinfo/sps-list

10 years, 6 months

[Aspuru-Guzik group list] Mark Tuckerman Visit 10/28

by Cynthia M. Chew

Dear group, Prof. Mark Tuckerman (NYU) is visiting Harvard on Monday, Oct. 28 for the joint ITAMP/CCB Seminar series. His talk is at 2pm in Pfizer (see abstract below) and we hope to see you there. Please let me know if you are interested in having lunch with Mark. We have a few spots available. *Structure and transport of topological defects in hydrogen bond networks: Studies of water and phosphates using first-principle molecular dynamics* Proton transport in aqueous and non-aqueous hydrogen-bonded media has long been an area of intense study due to its fundamental importance in emerging energy technologies such as hydrogen fuel cells and in biological problems such as proton pumping. Our understanding of proton transport phenomena is based on the concept structural diffusion of a topological defect in the hydrogen bond network originally proposed by C. J. T. von Grotthuss in 1806. Within this picture, long-range proton transport is driven by specific structural rearrangements in the local hydrogen bonding environment, however, pinning down the specific microscopic mechanisms in different media remains an immense challenge that has an immediate impact on the problem of designing novel materials for enhancing the proton transport process. In this talk, I will show how first-principles molecular dynamics has contributed to our understanding of proton transport phenomena in a variety of systems including aqueous acidic and basic solutions, pure phosphoric acid, and phosphoric acid doped with water or imidazole. It will be shown that proton transport in aqueous systems relies largely on local fluctuations in the hydrogen bond network while phosphate systems, by contrast, transport protons along extended, polarized chains in a manner much closer to the original picture suggested by von Grotthuss.* * Best, Cynthia * * Cynthia M. Chew Faculty Assistant | Aspuru-Guzik Research Group Department of Chemistry and Chemical Biology | Harvard University 12 Oxford Street | Mallinckrodt 112 | Cambridge, MA 02138 617.496.1716 office | 617.496.9411 fax http://aspuru.chem.harvard.edu/

10 years, 6 months

[Aspuru-Guzik group list] Hans Peter Buechler - Today - HQOC/ITAMP Joint Quantum Sciences Seminar

by Hamilton, Joan

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, October 23, 2013 4:00 PM - J250 Refreshments will be served at 4:00 PM Hans Peter Büchler University of Stuttgart, Germany "Majorana Fermions and P-wave Superfluids with Cold Atomic Gases in Optical Lattices" We present an ideal system to study the transition from the one-dimensional Kitaev chain to two-dimensional topological p-wave superfluids. The setup is based on fermionic atoms in an optical lattice, where the p-wave interaction is driven by a lattice resonance. We identify several topological phase transition, characterized by different majorana modes. Finally, we present the details for the experimental realization as well as verification of the non-abelian statistics of the majorana Fermions. Joan Hamilton Faculty Assistant to Profs. Greiner and Lukin HQOC Laboratory Administrator HUCTW Local Union Representative Harvard University Department of Physics 17 Oxford Street Cambridge, MA 02138 P: (617) 496-2544 F: (617) 496-2545

10 years, 6 months

[Aspuru-Guzik group list] Bruce Berne talk today

by Stéphanie Valleau

Hi everyone, I found out that Bruce Berne is giving a talk at mit today. Here are the details: *Time: *4.30-6pm *Location: *MIT 6-120 *What:* A.D. Little Lecture in Physical Chemistry: Bruce Berne, Columbia University - *How Hydrophobic Polymers and Proteins Respond to Osmolytes* Best, Stephanie

10 years, 6 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] group meeting this Thursday

by Ryan Babbush

Hi Everyone, This Thursday Martin Blood-Forsythe will be presenting the Aspuru-Guzik group meeting. As usual, we will meet at 2:30pm in the Division Room. An abstract for Martin's talk is included below. ========================================= Hydrogen-bonded pigments for organic electronics ========================================= Successful organic electronics are typically composed of highly conjugated molecules with strong intermolecular coupling. While long considered central to charge transfer, conjugation could impact intramolecular coupling without being intrinsically important. Thus we seek to investigate how efficient charge transport can be realized in materials without extensive conjugation. We model the transport properties of quinacridone, a low-cost, air-stable pigment that forms a tightly packed lattice owing to strong hydrogen bonds. The influence of the hydrogen bonding network is studied with DFT through the use of various functionals, including long-range and dispersion corrections. Quinacridone also displays a number of unusual excited state properties, including a long-lived fluorescent state and extremely high external quantum efficiency for photocurrent generation in single layer thin film solar cells. Time will be left at the end to discus the next steps I plan to take toward understanding the excited state properties and improving the charge transport models. -- Ryan Babbush | PhD Student in Physics (949) 331-3943 | babbush(a)fas.harvard.edu Harvard University | Aspuru-Guzik Group 12 Oxford Street | Cambridge, MA 02138 _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

10 years, 6 months

[Aspuru-Guzik group list] 10/23 HQOC/ITAMP Joint Quantum Sciences Seminar

by Hamilton, Joan

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, October 23, 2013 4:00 PM - J250 Hans Peter Büchler University of Stuttgart, Germany "Majorana Fermions and P-wave Superfluids with Cold Atomic Gases in Optical Lattices" We present an ideal system to study the transition from the one-dimensional Kitaev chain to two-dimensional topological p-wave superfluids. The setup is based on fermionic atoms in an optical lattice, where the p-wave interaction is driven by a lattice resonance. We identify several topological phase transition, characterized by different majorana modes. Finally, we present the details for the experimental realization as well as verification of the non-abelian statistics of the majorana Fermions. Joan Hamilton Faculty Assistant to Profs. Greiner and Lukin HQOC Laboratory Administrator HUCTW Local Union Representative Harvard University Department of Physics 17 Oxford Street Cambridge, MA 02138 P: (617) 496-2544 F: (617) 496-2545

10 years, 6 months

[Aspuru-Guzik group list] Meeting with Prof. Baroni

by Xavier Andrade

Hi all, The meeting with Prof. Baroni with group members will be this Thursday October 24 from 11:15 to 12:15 in the Division Room. Note that his talk has been moved to Thursday here at Harvard (Pfizer room, 4:00 PM). Xavier

10 years, 6 months

[Aspuru-Guzik group list] ITAMP topical lunch discussion: Thursday October 24 @ 12:00

by tony.lee＠cfa.harvard.edu

Dear Friends, On Thursday, October 24, there will be an ITAMP topical lunch discussion. Tea Room (P-226) @ CfA (60 Garden Street) Time: 12:00-1:30 As always pizza will be served. Speaker: Philipp Strack Title: Umklapp Lasing with a Quantum Degenerate Fermi Gas Abstract: We introduce the driven quantum degenerate Fermi gas as a lasing medium in optical cavities. We show that the existence of a Fermi surface fundamentally alters the behavior of the charge-ordering ("self-organization") superradiant transition that occurs when the atoms are driven sufficiently strongly. Resonant Umklapp scattering processes, where the fermions are scattered from one side of the Fermi surface to the other by exchanging photon momenta, lead to Peierls reconstruction of the dynamical cavity band structure at low superradiance threshold. The spectral properties of the cavity light field can be tuned by the Fermi wavevector (the density of the gas) relative to the cavity and pump photon momenta. The cavity spectrum can have broadband features from the fermionic particle-hole continuum as well as frequency ranges with narrow linewidth due to dispersive effects of the Fermi gas. Looking forward to seeing you there, Tony Lee

10 years, 6 months

[Aspuru-Guzik group list] [qip] the return of the qip lunch

by Henry Yuen

Hi all, A bunch of us have expressed the opinion that a weekly lunch (which Aram initiated earlier this semester) is a totally good idea, and we should continue it. So I propose that tomorrow (Tuesday), anybody who's interested meet on the 3rd floor of CTP at 11:50am, and we can head to the food trucks and come back to CTP by 12:10pm and find a place to eat and chat. (This plan is rather similar to the previous lunches). My number is 949-705-9926 just in case. Hope to see y'all! Henry _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

10 years, 6 months

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aspuru-list October 2013