Condensed Matter Sack Lunch Seminar

semester, 2010


Tuesday, January 19th 2010
12:20 pm:
Speaker: Tanner Schulz, University of Minnesota
Subject: Superconducting Nb Noise Measurements on Periodic Alumina Nanopores

Tuesday, January 26th 2010
12:20 pm:
Speaker: Eric Garlid, University of Minnesota
Subject: Electrical Measurement of the Direct Spin Hall Effect in Fe/InGaAs Heterostructures

Tuesday, February 2nd 2010
12:20 pm:
There will be no seminar this week.

Tuesday, February 9th 2010
12:20 pm:
Speaker: Dan Endean, University of Minnesota
Subject: Comparing CIP and CPP GMR using Microwave Techniques

Tuesday, February 16th 2010
12:20 pm:
Speaker: Yeonbae Lee, University of Minnesota
Subject: Ionic gated electric double layer transistor of strontium titanate

Tuesday, February 23rd 2010
12:20 pm:
Speaker: Mike Erickson, University of Minnesota
Subject: Temperature dependence of the spin accumulation in nanostructured metallic spin valves.

Tuesday, March 2nd 2010
12:20 pm:
Speaker: Joe Kinney, University of Minnesota
Subject: Penetration Depth measurements using a Tunnel Diode Oscillator

Tuesday, March 9th 2010
12:20 pm:
Speaker: Feng Guo, Tanner Schulz, Brian Skinner, Pan LiDong Pan, Shun Wang
Subject: March Meeting practice talks

Tuesday, March 16th 2010
12:20 pm:
There will be seminar this week.

Tuesday, March 23rd 2010
12:20 pm:
Speaker: JJ Nelson, University of Minnesota
Subject: Title to be announced.

Tuesday, March 30th 2010
12:20 pm:
Speaker: Elizabeth Smith, University of Minnesota
Subject: Quantization of Protein Expression Fractions in Living Cells

Tuesday, April 6th 2010
12:20 pm:
Speaker: Chad Geppert, University of Minnesota
Subject: Spin Transport in a Semiconductor Far From Equilibrium

Tuesday, April 13th 2010
12:20 pm:
Speaker: Mike Schecter, University of Minnesota
Subject: Critical Force for a Supersonic Particle In a Bose Gas
4:40 pm:
Speaker: Can Zhang, University of Minnesota
Subject: Study of Overlapping process and Psi(3770) energy scan in BES-III
This is the public portion of Mr. Zhang’s Senior Honors Thesis Defense

Tuesday, April 20th 2010
12:20 pm:
Speaker: Xi Chen, University of Minnesota
Subject: Spinwave condensation and fluctuation of magnetic anisotropy

Tuesday, April 27th 2010
12:20 pm:
Speaker: Kent Bodurtha, University of Minnesota
Subject: Thin Film Transistor Structures using Amorphous and Nanostructured Mixed-Phase Silicon Films

Tuesday, May 4th 2010
12:20 pm:
Speaker: Dan Dahlberg, University of Minnesota
Subject: Meeting with graduate students that made a sack lunch presentation during the 09-10 school year

Tuesday, May 11th 2010
12:20 pm:
There will be no seminar this week.

Tuesday, September 14th 2010
12:20 pm:
Speaker: Rob O'Connell, University of Minnesota
Subject: Imaging Ultra-Short T2 in MRI

The ideal sequence for measuring ultra-short T2 spins comprises a series of infinitely short excitation pulses (delta-pulses) followed immediately by FID acquisition, with no delay in between. However, this sequence cannot be practically realized since RF pulses have finite duration and time is required for scanner electronics to switch from transmit to receive modes. Furthermore, off-resonance spins are affected differently when using conventional hard pulses having finite duration. A relatively new method known as SWIFT, sweep imaging with Fourier transformation, comes close to offering many of the desirable features of the delta -pulse sequence. The purpose of this work was to provide a theoretical framework and computer simulations to compare SWIFT with the ideal delta-pulse sequence and with a hard pulse sequence using finite pulse length.


Tuesday, September 21st 2010
12:20 pm:
Speaker: Matt Parker, University of Minnesota
Subject: Dynamics of Population Systems with Near Marginal Stability

Tuesday, September 28th 2010
12:20 pm:
Speaker: Lee Wienkes, University of Minnesota
Subject: "The Hydrogen Glass in Doped Hydrogenated Amorphous/Nanocrystalline Silicon"

As a result of the glass-like structure of the hydrogensub-network within hydrogenated amorphous silicon (a-Si:H), this material is not in thermal equilibrium at all temperatures. In particular, the defect structure of doped a-Si:H changes with temperature at a rate that is thermally activated, slowing down as the temperature decreases. This manifests itself in several interesting phenomena, including an apparent "kink" in the conductivity, a room temperature conductivity that is thermal history dependent and a slow, stretched-exponential relaxation of the defect structure at temperatures where it is not in equilibrium. These same phenomenon are observed in mixed phase amorphous/nanocrystalline silicon and turn out to be sensitive to the concentration of nanocrystallite embedded within the mixed-phase thin film. I will first present a
background regarding the above thermal equilibration effects and then discuss the
hydrogen glass model in the context of mixed-phase materials.


Tuesday, October 5th 2010
12:20 pm:
Speaker: Andrew Gustafson, University of Minnesota
Subject: Simulating Entangled Polymers and Polymer Melt Boundaries

Tuesday, October 12th 2010
12:20 pm:
Speaker: Te-Yu Chen, University of Minnesota
Subject: Pinning mechanisms for vortices in ferromagnetic films

Tuesday, October 19th 2010
12:20 pm:
Speaker: Brian Skinner, University of Minnesota
Subject: Anomalously large capacitance of a two-dimensional electron gas next to a metal surface

Tuesday, October 26th 2010
12:20 pm:
Speaker: LiDong Pan, University of Minnesota
Subject: XRD Study of Mixed Structures in Liquid Crystal

Tuesday, November 2nd 2010
12:20 pm:
Speaker: Yen-Hsiang Lin, University of Minnesota
Subject: "Magnetoresistnace peak in superconductor-insulator transition"

Tuesday, November 9th 2010
12:20 pm:
Speaker: Dan Endean, University of Minnesota
Subject: Microwave Measurements of Giant Magnetoresistance

Tuesday, November 16th 2010
12:20 pm:
Speaker: Mike Erickson, University of Minnesota
Subject: The spin diffusion length in nanoscopic lateral metallic spin valves
To be announced.

Tuesday, November 23rd 2010
12:20 pm:
There will be no seminar this week.

Tuesday, November 30th 2010
12:20 pm:
Speaker: Tom Dunn, University of Minnesota
Subject: Optimization of Spin Torque Induced Magnetic Switching

Tuesday, December 7th 2010
12:20 pm:
Speaker: Yeonbae Lee, University of Minnesota
Subject: Phase diagram of the electrically gated Strontium titanate

Tuesday, December 14th 2010
12:20 pm:
There will be no seminar this week.

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