Highlights
May 7, 2012
Cornell University
Visualizing the intricate electron pairing in iron-based superconductors
M. P. Allan, A. W. Rost, A. P. Mackenzie, Y. Xie, J. C. Davis, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, and T.-M. Chuang, , Science 336, 563-567, (2012).
Correlated
motion provides new clues to the magnetic origin of high-temperature
superconductivity
Superconducting
wires conduct electricity perfectly — without any energy losses — because
each electron spontaneously bonds to a partner electron. The pairs then perform
an intricate dance down the wire, never bumping into the walls or other pairs. Unfortunately,
May 3, 2012
University of Utah
FRG-2 – Using Weakly Spin-Coupled Polaron Pair States for a Calibration Free Absolute Magnetometry
W. J. Baker, K. Ambal, D. P. Waters, R. Bardaa, K. v. Schooten, D. R. McCamey, J. M. Lupton, C. Boehme
Objective:
A precise absolute magnetometer based on organic spintronics that is scalable to micron dimensions, has low cost and that is not adversely affected by environmental influences (temperature, air etc.).
Approach: Integrated bipolar MEH-PPV device above magnetic field strip lines for magnetic resonant excitation. The B-field is measured through spin-dependent current changes under magnetic resonance.
Results and Significance: For the p-conjugated polymer MEH-PPV, an ABSOLUTE sensitivity of
May 3, 2012
University of Utah
Liquid Metal-Based Plasmonics
Ajay Nahata and Z. Valy Vardeny
Objective: To develop and characterize new plasmonic metamaterials in the terahertz (THz) spectral range.
Approach: Explore unconventional materials that are typically not suitable for plasmonics applications at optical frequencies but exhibit reasonable conductivities at THz frequencies.
Results and Significance: Liquid metals and well-developed microfluidic technology can be used successfully to create useful devices in a frequency range commonly referred to as the “gap in the electromagnetic spectrum.”
May 3, 2012
University of Utah
Seed Project: The Dynamics of Organic Magneto-resistance (OMAR)
Andrey Rogachev and Tho Nguyen
Objective: To study the dynamics of magneto-resistance in organic diodes
Approach: Measure electronic transport and magneto-transport of organic diodes as a function of frequency with an applied magnetic field using admittance spectroscopy
May 3, 2012
University of Utah
JELL-O OPTICS ACTIVITY
MRSEC outreach activities coordinate with Utah Core Curriculum Standards. These sixth-graders are studying the properties of light in their classroom.
The Adelante program seeks to increase the expectation of university attendance and success among Hispanic students at Jackson Elementary.
Participants:
May 2, 2012
Georgia Institute of Technology
Twisting the height away
M. Kindermann and P. N. First, Georgia Tech, School of Physics
Multilayer graphene grown at Georgia Tech to heights of 1 to 10 nanometers contains non-graphitic “twists” between layers. Our recent theory describes the top layer as a single, effectively isolated graphene sheet. The remaining multilayer creates a periodically varying mass of the top-layer electrons: from positive, to zero, to negative(!). This makes intuition from single-layer graphene available for the analysis of twisted multilayer graphene, and predicts a regular pattern in the electronic structure that has been observed in experiments from our GT/NIST collaboration.
May 2, 2012
Georgia Institute of Technology
Graphene Sensing of Biomolecules and Chemical Environment
J. Curtis, C. Berger, W. de Heer - Georgia Tech, School of Physics
Fluidic chamber placed on top of
graphene sensor to exchange fluid
and hence protein or chemical
concentration during a measurement.
May 1, 2012
International Collaboration in Soft Matter Research and Training
Orlin D. Velev, Carol K. Hall, North Carolina State University S. Klapp, G. Findenegg, M. Gradzielski, Technical University, Berlin, Germany
The Triangle MRSEC enjoys a vibrant ongoing partnership with German researchers supported through an International Graduate Research and Training Grant (IGRTG) from the DFG. A significant component of this partnership is extended graduate student exchanges. An example of funded projects is the fundamental modeling of particle gelation by molecular dynamics simulations by Prof. Sabine Klapp (Technical Univ. - Berlin), Carol Hall and Orlin Velev.
May 1, 2012
Dynamic Electrostatic Lithography: Multiscale On-demand Patterning on Large Area Curved Surfaces
Q. Wang, M. Tahir, J. Zang, and X. Zhao, Duke University
Triangle MRSEC researchers
have invented a new technology for the use of electrical voltages to
dynamically generate various patterns on curved surfaces and over large areas,
such as the surfaces of gloves.
The applied voltages deform flat surfaces of rubbers into patterns of creases,
lines, and craters. The patterns can be random, aligned or curved, and their
feature sizes can be tuned from micrometers to millimeters. As the voltages are
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