Materials science

Study Molecules on Graphene by Low Temperature Scanning Tunneling Microscopy
There are three parts of this talk. First I will introduce step by step how to build one low noise Scanning Tunneling Microscopy (STM) system, particularly for optical experiments. Many details were considered to minimize the noise level of the system. Then I will talk about some experiments on the epitaxial graphene grown on Ru(0001) surface. Periodic Moiré pattern is formed on graphene surface due to the lattice mismatch between graphene and substrate.
Efficient and Accurate Quantum Chemistry for Biological Systems
In this talk, I will discuss our recent efforts in developing and employing both novel algorithms and novel hardware (ie. graphical processing units) to enable the dramatic speed-up of quantum chemical techniques. Using these approaches, simulations of thousands of atoms that normally require half a week on a standard computer now only take half an hour.
The Nature of Nano
Northwestern University Chicago Campus
Hughes Auditorium
303 E. Superior Street, Chicago, IL 60611

The Chicago Council on Science and Technology C2ST and Argonne present "The Nature of Nano" Wednesday, December 11, from 5 p.m. to 8 p.m.

Broken SU(4) Symmetry and The Fractional Quantum Hall Effect in Graphene
Since its discovery more than three decades ago, the fractional quantum Hall effect has been studied almost exclusively in the two-dimensional electron systems formed in GaAs/AlGaAs heterojunctions. However, recent improvements in the quality of graphene have revealed a rich landscape of fractional quantum Hall states in this material, heralding the beginning of a new chapter in fractional quantum Hall physics.
Ferromagnetic Resonance and Spin Wave Studies in Permalloy Nanostructures and YIG Films
In this talk I will summarize a somewhat eclectic program of study involving broadband ferromagnetic resonance (FMR) experiments at Northwestern. One portion of the talk will be devoted to describing FMR and spin wave modes in permalloy (Py) thin film nanostructures. In the Py systems one of our motivations is to study structures that are conducive in coupling to specific finite wavelength magnetostatic modes.
Tunnel-Fluctuoscopy: Fluctuation Induced Low-Bias Anomaly
Electron tunneling spectroscopy pioneered by Esaki and Giaever offers a powerful tool for studying electronic spectra in superconductors. The phenomenological theory by Giaever and Megerle related the tunneling current to the electronic densities of states and to the difference of their equilibrium distribution functions in electrodes. This led to impressive discoveries having revealed, in particular, of the wide, pseudogap in the tunneling spectrum of superconductors above their critical temperatures.