Materials Research Laboratory
http://illinois.edu/calendar/list/79
Event calendar for the Frederick J. Seitz Materials Research Laboratory (an interdisciplinary research facility within the UIUC College of Engineering)Soft Materials Seminar
http://illinois.edu/calendar/detail/79/32055136
seminarhttp://illinois.edu/calendar/detail/79/32055136Tue, 30 Sep 2014 16:00:00 CDTDaniel Bacon-Brown (Braun group), "Development of nanostructured materials exhibiting strong circular dichroism"; Lizhi Xu (Rogers group), "3D conformal electronic membranes for cardiac physiological mapping and stimulation"; Josh Grolman (Moore group), "pH-dependent reversible permeability from core-shell microcapules"2014-2015 John C. Bailar Lecture, Prof. Richard Eisenberg, University of Rochester, "Fuel from Water: The Light-Driven Generation of Hydrogen"
http://illinois.edu/calendar/detail/79/31718176
Seminar of Special Interesthttp://illinois.edu/calendar/detail/79/31718176Tue, 30 Sep 2014 20:00:00 CDTPhysics Colloquium: "Interaction effects on topological insulators and superconductors"
http://illinois.edu/calendar/detail/79/31907577
Physics Colloquiumhttp://illinois.edu/calendar/detail/79/31907577Wed, 01 Oct 2014 16:00:00 CDTIn recent years, we have seen remarkable progress in our ability to classify and characterize phases of quantum matter. This progress has been driven in part by the theoretical prediction and experimental realization of topological insulators: unusual materials, whose bulk is gapped and insulating, while the surface is gapless and conducting.
In this talk, I will describe how the original non-interacting picture of topological insulators (and related phases of matter) based on electronic band-structure is modified in the presence of strong interactions. As I will show, electronic correlations give rise to a host of qualitatively new phenomena such as: i) appearance of novel phases, absent in the non-interacting realm; ii) collapse of several phases in the non-interacting classification to a single phase; iii) in the case of 3d systems, existence of exotic gapped surface phases, akin to fractional quantum Hall fluids, whose excitations possess fractional electric charge and fractional statistics.Special Condensed Matter Seminar: Thermalization and its discontents: how transport vanishes at the many-body localization transition."
http://illinois.edu/calendar/detail/79/32113044
CM Seminarhttp://illinois.edu/calendar/detail/79/32113044Thu, 02 Oct 2014 10:00:00 CDTMany-body localized (MBL) states are states of isolated quantum systems in which thermalization is absent, i.e., the system does not act as a heat bath for its constituent parts. The transition between the thermalizing ("metallic") and MBL states is highly unconventional, as equilibrium statistical mechanics itself breaks down at the putative critical point. I will discuss recent work on approaching the MBL transition from the metallic side, from three different angles: (1) looking for signatures of incipient MBL in imperfectly isolated systems; (2) constructing a "mean-field" theory of relaxation in a metal that is an increasingly bad heat bath for its constituent parts; and (3) exploring the intermediate, rare-region dominated regime that lies between the metallic and localized states in one dimension.CHBE 565 Seminar, Professort Manos Mavrikakis, University of Wisconsin, Madison, "Reaction Mechanisms and New Catalytic Materials from First-principles"
http://illinois.edu/calendar/detail/79/31968642
Academichttp://illinois.edu/calendar/detail/79/31968642Thu, 02 Oct 2014 14:00:00 CDTHard Materials Seminar
http://illinois.edu/calendar/detail/79/32055154
seminarhttp://illinois.edu/calendar/detail/79/32055154Thu, 02 Oct 2014 16:00:00 CDTGyungmin Choi (Cahill group), "Spin current generated by thermally driven ultrafast demagnetization"; Pamela Pena Martin (Rockett group), "Atomic scale analysis of AgInSe2"Condensed Matter Seminar: symmetry-respecting gapped phase with non-Abelian anyon excitations on the surface of a 3d topological insulator.
http://illinois.edu/calendar/detail/79/32002724
CM Seminarhttp://illinois.edu/calendar/detail/79/32002724Fri, 03 Oct 2014 13:00:00 CDTA 3d electron topological insulator (eTI) is a phase of matter protected by particle-number conservation and time-reversal symmetry.
It was previously believed that the surface of an eTI must be gapless unless one of these symmetries is broken. A well-known symmetry-preserving, gapless surface termination of an eTI carries an odd number of Dirac cones. In this talk, I will show that in the presence of strong interactions an eTI surface can actually be gapped and symmetry preserving, at the cost of supporting excitations with fractional charge and non-Abelian statistics. I will argue that such a surface phase can be obtained by depositing an s-wave superconductor on the eTI surface and then proliferating the quadruple (flux 2hc/e) vortex. The resulting surface phase possesses non-Abelian charge e/4 anyon excitations and is reminiscent of the Moore-Read phase of the quantum Hall fluid at filling factor 5/2. The time-reversal and particle number symmetries are realized in this surface phase in an ``anomalous'' way: one which is impossible in a strictly 2d system. If time permits, I will discuss related results on surface phases of 3d topological superconductorsICMT Seminar: "Defects: A new window into topological quantum matter"
http://illinois.edu/calendar/detail/79/32069679
ICMT Seminarhttp://illinois.edu/calendar/detail/79/32069679Mon, 06 Oct 2014 12:00:00 CDTTopologically ordered states, such as the fractional quantum Hall (FQH) states, are quantum states of matter with various exotic properties, including quasiparticles with fractional quantum numbers and fractional statistics, and robust topology-dependent ground state degeneracies. In this talk, I will describe a new aspect of topological states: their extrinsic defects. These include extrinsically imposed point-like or line-like defects that couple to the topological properties of the state in non-trivial ways. The extrinsic point defects localize topologically protected "parafermion" zero modes, which generalize the notion of Majorana fermion zero modes, and provide a new direction for realizing non-Abelian quantum statistics and topological quantum computation. The line defects allow direct quantum mechanical coupling between electrons and fractionalized anyons, leading to new ways to probe fractionalization. After describing the conceptual framework, I will focus on a specific set of experimental proposals, using conventional bilayer FQH states, to detect parafermion zero modes and to directly observe the long-predicted topological ground state degeneracy of FQH states. In the end I will comment on other ways in which extrinsic defects provide a new window into fractionalization.Materials Science and Engineering Colloquium
http://illinois.edu/calendar/detail/79/32007007
seminarhttp://illinois.edu/calendar/detail/79/32007007Mon, 06 Oct 2014 16:00:00 CDT"Dynamics of cytoskeletal materials" - This talk will describe quantitative analyses of particle-tracking data for systems with cytoskeletally associated molecular motors to better understand the motions contributing to intracellular transport and, more generally, the means for characterizing systems far from equilibrium. In particular, we have studied the motions of insulin-containing vesicles (granules) in a pancreatic beta cell line. We find glassy behavior with correlations in both space and time. These data can be modeled by subordinating an ergodic random walk process to a non-ergodic one. We relate the dynamics to the underlying microtubule structure and mathematical models of materials. Our results provide a simple physical mechanism for how complex insulin secretion kinetics can arise. Time permitting, these dynamics will be compared with those of actomyosin assemblies, and a novel means for quantifying directional motion in particle-tracking data will be discussed.Mr. Cody Tripp, UIUC, "TBA"
http://illinois.edu/calendar/detail/79/32083746
Seminarhttp://illinois.edu/calendar/detail/79/32083746Mon, 06 Oct 2014 16:00:00 CDT