Condensed Matter Sack Lunch Seminar

semester, 2016


Friday, January 22nd 2016
Speaker: Yuriy Sizyuk, University of Minnesota
Subject: "Lifting mean field degeneracies in anisotropic spin systems

Friday, January 29th 2016
There will be no seminar this week.

Friday, February 5th 2016
Speaker: Gordon Stecklein, University of Minnesota
Subject: Spin Transport in One to Three Layer CVD Graphene"

Friday, February 12th 2016
Speaker: Terry Bretz-Sullivan, University of Minnesota
Subject: Magnetic Field Reentrant Superconductivity in Aluminum Nanowires

Friday, February 19th 2016
There will be no seminar this week.

Friday, February 26th 2016
Speaker: Chris Conklin, University of Minnesota
Subject: Electrokinetic flows in liquid crystals

Friday, March 4th 2016
Speaker: Yang Tang, University of Minnesota
Subject: Doping dependence of the antiferromagnetic response of HgBa2CuO4+d

Friday, March 11th 2016
APS March Meeting practice talks

Friday, March 18th 2016
There will be no seminar this week, spring break.

Friday, March 25th 2016
Speaker: Mengxing Ye, University of Minnesota
Cancelled today -- Moved to April 8th

Friday, April 1st 2016
12:20 pm:
Speaker: Biqiong Yu, University of Minnesota
Subject: “X-ray scattering study of Charge-Density-Wave order in Nd2-xCexCuO4 and HgBa2CuO4+d
Note: change of location for seminar, this week only.

Friday, April 8th 2016
Speaker: Mengxing Ye, University of Minnesota
Subject: Quantum Phase Transitions in Triangular Heisenberg Antiferromagnets in a Magnetic Field

Friday, April 15th 2016
Speaker: Tianbai Cui, University of Minnesota
Subject: Rare region effects on the Ising-nematic quantum phase transition

Friday, April 22nd 2016
Speaker: Mahendra DC, University of Minnesota
Subject: Characterization of spin-orbit torques in bismuth selenide films by using dc planar Hall method

Friday, April 29th 2016
12:20 pm:
Speaker: Chun Chen, University of Minnesota
Subject: Tunable splitting of the Ground-State Degeneracy in Quasi-1D Parafermion systems
Please note change of speaker from last announcement.

Friday, May 6th 2016
Speaker: Yilikal Ayino, University of Minnesota
Subject: Magnetotransport in NdTiO3/SrTiO3 Interface

Friday, May 13th 2016
12:20 pm:
Speaker: David Harrison, University of Minnesota
Subject: Dimensional Crossover in Spin Glass Dynamics

Friday, September 9th 2016
12:20 pm:
Speaker: Ziran Wang
Subject: GMR enhancement and oscillation in Fe/Ag/Fe/InAs/Ag(100)

Friday, September 16th 2016
Speaker: Michael Sammon, University of Minnesota
Subject: Electron Accumulation Layer in the Extreme Quantum Limit

Friday, September 23rd 2016
Speaker: Peter Martin, University of Minnesota
Subject: Investigating Soft Condensed Matter Systems Using Electron Paramagnetic Resonance Spectroscopy

Friday, September 30th 2016
Speaker: James Delles, University of Minnesota
Subject: Transport Properties of Exchange Biased Mesoscale Wires

Friday, October 7th 2016
Speaker: Tim Peterson, University of Minnesota
Subject: Spin Hall effects in ultrathin heavy metal/ferromagnet bilayers

Friday, October 14th 2016
Speaker: Ruiqi Xing, University of Minnesota
Subject: Renormalization group analysis of competing instabilities in the four-pocket model for iron-based superconductors

In iron-based superconductors, superconductivity, magnetism and nematic orders are all observed. To understand the phase diagram and the interplay between different orders in iron-based superconductors, we use parquet renormalization group, an unbiased approach, to study the full four-pocket, 3-orbital low-energy model.

Starting from all symmetry-allowed interactions, we derive and analyze the RG flow of the couplings and susceptibilities. We obtain the hierarchy of competing instabilities and obtain, as limiting cases, the behavior, which was previously found in approximate models [A.V. Chubukov, M. Khodas and R.M. Fernandes, arxiv:1602.05503]. For parameters relevant to FeSe, we found that upon lowering the temperature, nematic order is the leading instability, followed by superconductivity, while the magnetic order doesn't appear. We found that the nematic order parameter has three components, and found particular relation between the components, consistent with ARPES experiment[A. Fedorov et al, arxiv:1606.03022].


Friday, October 21st 2016
Speaker: Xuzhe Ying, University of Minnesota
Subject: 'Robustness and tunneling Property of Majorana in hybrid semiconductor-superconductor structure

Semiconductor nanowire with spin-orbit coupling and superconductivity from proximity effect is usually used as a model for topological superconductor. I will first talk about the topological phase transition for free electrons as well as interacting electrons. Then I'll discuss Majorana related tunneling problem and show a signature of Majorana.


Friday, October 28th 2016
Speaker: Ezra Day-Roberts, University of Minnesota
Subject: Counting Zero Energy States in the Penrose Lattice

Friday, November 4th 2016
Speaker: Gordon Stecklein, University of Minnesota
Subject: Spin transport in graphene

Friday, November 11th 2016
Speaker: Zack Robinson, University of Minnesota
Subject: Controlling Conductivity in Zinc Oxide Nanocrystals with Intense Pulsed Light

Friday, November 18th 2016
Speaker: Chris Conklin, University of Minnesota
Subject: Nonlinear Electrophoresis of Particles in Liquid Crystals

Friday, November 25th 2016
There will be no seminar this week.

Friday, December 2nd 2016
Speaker: Justin Watts, University of Minnesota
Subject: Spin Kondo Effect and Interdiffusion in Co/Cu Non-Local Spin Valves

Friday, December 9th 2016
Speaker: Yilikal Ayino, University of Minnesota
Subject: Ferromagnetism in NdTiO3/SrTiO3 Interface

Friday, December 16th 2016
There will be no seminar this week.

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