Events

Leeor Kronik, Weizmann Institute
Thursday, January 17, 2019 - 2:30pm
Chevron 150

Molecular crystals are crystalline solids composed of molecules bound together by relatively weak intermolecular interactions, typically consisting of van der Waals interactions and/or hydrogen bonds. Hybrid crystals combine molecular units and covalent/ionic networks.

Both classes of crystals play an important role in many areas of science and engineering, ranging from biology and medicine to mechanics and electronics. Therefore, much effort has been dedicated to understanding their structure and properties.

Predicting the behavior of such materials from first principles is highly desired for understanding their unique properties and for allowing rational design of novel materials and structures. Preferably, we would like to obtain such understanding from density functional theory (DFT), because the relative computational simplicity afforded by DFT allows us to attack realistic, experimentally accessible problems. Unfortunately, despite many other successes, DFT has traditionally struggled with useful prediction of properties of crystals that contain weakly-bound units.

Here, I will show how state-of-the-art DFT approaches allow us to overcome these limitations, quantitatively. I will focus on our recent progress in explaining and even predicting important classes of collective effects, i.e., phenomena that the individual units comprising the crystal do not exhibit, but arise through their interaction. Specifically, I will address unique structural, mechanical, electrical, and optical properties of both biogenic and synthetic crystals, with an emphasis on constructive interaction between theory and experiment.

Jan24
4:00am
Synthesizing quantum matter with electrons and microwave photons
Experimental research at the nanoscale continues to challenge our ability to predict the behavior of quantum systems. Advances with lithographically patterned solid-state electronic devices have enabled multiple platforms for the simulation of quantum matter. In particular, semiconductor quantum dots and superconducting qubits provide tools for studying the wealth of physics induced by nonlinearities at the single electron and single microwave-photon level, respectively, and have been separately pursued as enabling technologies for qubits. In recent years, hybrid devices that combine such historically distinct lines of research have received greater attention, whether to enable novel sensing or measurement applications, or to couple small systems of qubits together at long range (e.g. quantum transduction). I will showcase the rich behaviors and phases of quantum matter that coupled quantum dots can exhibit, including a surprising transport mechanism called cotunneling drag, signatures of Kondo physics with emergent symmetry , and non-Fermi liquid states. I will also discuss my work towards fabricating superconducting qubits on silicon-on-insulator substrates for hybrid device applications. The integration of quantum dots and superconducting resonators promises to yield new probes for studying quantum matter, and superconducting qubits are coming of age in their own right for the implementation of many-body spin models.
Talk location: 321 Allen Hall Spring 2019 Seminars
Dr. Andrew Keller
Institute for Quantum Information and Matter (IQIM) at Caltech
Jan24
2:00pm
Plasmon Decay and Hot Carrier Generation in Plasmonic Nano Particles from Ab Initio
Dr. Mikael Kuisma seeks quantitative and qualitative understanding of nanoscale quantum dynamics, such as collective excitations in functionalized noble metal nanoparticles and hot carrier generation with potential applications from microscopy to photovoltaics. He is also a developer of GPAW electronic structure program, which he further utilized to run large scale parallel models of electron dynamics in nanosystems.
Talk location: 307 Eberly Hall Spring 2019 Seminars
Mikael Kuisma
University of Jyväskylä
Jan28
4:00pm
mK to km: How Millikelvin Physics is Reused to Explore the Earth Kilometers Below the Surface
Robert L. Kleinberg is an Adjunct Senior Research Scholar at the Center on Global Energy Policy of the Columbia University School of International and Public Affairs. From 1980 to 2018 he was employed by Schlumberger, attaining the rank of Schlumberger Fellow, one of about a dozen who hold this rank in a workforce of 100,000. He has served on or advised numerous government and academic committees on energy policy, and is a coauthor with Harvard faculty of a textbook on energy technology, in preparation. Dr. Kleinberg was educated at the University of California, Berkeley (B.S. Chemistry, 1971) and the University of California, San Diego (Ph.D. Physics, 1978). From 1978 to 1980 he was a post-doctoral fellow at the Exxon Corporate Research Laboratory in Linden, NJ. His work at Schlumberger focused on geophysical measurements and the characterization and delineation of unconventional fossil fuel resources. His current interests include energy technology and economics. Dr. Kleinberg has authored more than 100 academic and professional papers, holds 38 U.S. patents, and is the inventor of several geophysical instruments that have been commercialized on a worldwide basis. He is the recipient of the 2018-2019 American Physical Society Distinguished Lectureship Award on the Applications of Physics, and is a member of the National Academy of Engineering. He is also a Non-Resident Senior Fellow at the Boston University Institute for Sustainable Energy.
Talk location: 102 Thaw Hall Spring 2019 Seminar
Dr. Robert Kleinberg
Columbia University
Jan31
4:00pm
From Platinum to Planck: The biggest revolution in metrology since the French Revolution
The International System of Units (SI) is the basis for measurements worldwide, and NIST, as the premier National Metrology Institute, has both shaped the development of the SI and led its implementation. On November 16, 2018 the Member States of the Treaty of the Meter voted to revise the International System of Units (SI), changing the world's definition of the kilogram, the ampere, the kelvin and the mole. This decision occurred at the 26th meeting ...
Talk location: 104 Thaw Hall Spring 2019 Seminar
Carl Williams
NIST
Feb11
4:30pm
Chemical and Physical Considerations in the Production of a Cup of Coffee
Despite coffee’s ubiquity and tremendous economic value (~1.5% of the USA GDP), there remains very little research in the field. Yet, numerous physical and chemical processes play a determining role in cup quality, ranging from agricultural practices, to roasting and brewing. This talk canvases the landscape of coffee research to date, detailing areas that require further study, as well as discussing our early efforts to better understand the key factors that determine cup quality and ...
Talk location: Thaw 102 Spring 2019 Seminar
Christopher Hendon
University of Oregon
Feb12
4:00pm
Electrically conductive metal-organic frameworks: insights from theory
Porous electrical conductors are a desirable yet evasive class of materials that would play a key role in the development of novel electrical energy storage devices. Their high surface area and electrical conductivity enable the uptake of electrolyte into their pores, forming the basis for a supercapacitive device. Metal-organic frameworks are an emerging subset of porous materials with fleeting reports of electrical conductivity suitably high for super capacitor implementation. This talk discusses our efforts to ...
Talk location: 307 Eberly Hall Spring 2019 Seminar
Christopher Hendon
University of Oregon
Feb18
2:00pm
Quantum Leap: From Test of Quantum Foundations to New Quantum Technologies (AIP) with lines
Driven by the initial curiosity of “spooky action at a distance” referred by Einstein, in the last few decades, many developed ground-breaking technologies for coherent manipulation of quantum systems offers elegant and feasible solutions for satisfying increasing needs of computational power and information security. Over the past three decades, the promises of super-fast quantum computing and secure quantum cryptography have spurred a world-wide interest in quantum information, generating fascinating quantum technologies for coherent manipulation of ...
Talk location: Thaw Hall 104 3943 O'Hara St, Pittsburgh, PA 15213 Seminar Spring 2019
Dr. Jianwei Pan
University of Science and Technology of China
Feb18
4:00pm
Dr. Nai Phuan Ong (Princeton University)
Talk location: Doherty Hall A301D Spring 2019 Seminar
Dr. Nai Phuan Ong
Princeton University
May25
12:00pm
Dr. Samindranath Mitra
TBD
Talk location: TBD Spring 2019
Dr. Samindranath Mitra
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