Condensed Matter Sack Lunch Seminar

semester, 2014

Tuesday, January 21st 2014
12:20 pm:
Speaker: Dmitry Spivak, University of Minnesota
Subject: Kondo Physics in Metallic Lateral Spin Valves

Tuesday, January 28th 2014
12:20 pm:
There will be no seminar this week.

Tuesday, February 11th 2014
12:20 pm:
There will be no seminar this week.

Tuesday, February 18th 2014
12:20 pm:
There will be no seminar this week.

Tuesday, February 25th 2014
12:20 pm:
Speaker: Tobias Gulden / J. J. Nelson / Chien-Te Wu
Subject: APS March Meeting practice talks

Tuesday, March 4th 2014
12:20 pm:
There will be no seminar this week, due to APS March Meeting.

Tuesday, March 11th 2014
12:20 pm:
Speaker: Andrew Galkiewicz, University of Minnesota
Subject: Resonance in Magnetostatically Coupled Transverse Domain Walls

Tuesday, March 25th 2014
12:20 pm:
Speaker: Mun Chan, School of Physics and Astronomy, University of Minnesota
Subject: The cuprate phase diagram : insights from neutron scattering and electrical transport

After almost three decades of research, high-temperature superconductivity in the cuprates is as yet an unsolved but actively pursued problem. Besides the superconductivity, the pseudogap phenomenon, wherein parts of the Fermi surface is gapped at a temperature T* well above the superconducting temperature Tc, is perhaps the most enigmatic. The critical open question is whether the pseudogap is a distinct ordered state and if so, what is its relationship to the superconductivity. To shed light on this problem, I have focused my experimental efforts on HgBa2CuO4+δ (Hg1201), which is arguably one of the most desirable of the 100+ cuprates to study: it features a relatively simple crystalline structure and manifests the highest Tc of the single-layered cuprates (more than twice that of La2-xSrxCuO4 (LSCO), the most widely studied compound). I will present our recent efforts utilizing neutron scattering and electrical transport to study this model compound. Our primary result is the demonstration of a hierarchy of ordering tendencies including novel magnetism and its intimate relationship to commensurate antiferromagnetic fluctuations, charge-density-wave correlations, superconductivity, and the reconstruction of the Fermi-surface at low temperatures revealed by Shubnikov de Haas oscillations.

Tuesday, April 1st 2014
12:20 pm:
Speaker: Joe Sobek, University of Minnesota
Subject: Tuning the Iron Selenide Superconducting Transition

Tuesday, April 8th 2014
12:20 pm:
Speaker: Xiaowei Zhang, University of Minnesota
Subject: Development of giant saturation magnetization FeN thin film

Tuesday, April 15th 2014
12:20 pm:
Speaker: Yilikal Ayino, University of Minnesota
Subject: Metal Insulator Transition in STO

Tuesday, April 22nd 2014
12:20 pm:
Speaker: Gaurav Shukla, University of Minnesota
Subject: High Temperature Elasticity of Iron and Aluminum-bearing MgSiO3 Perovskite: A First Principles Study

Tuesday, April 29th 2014
12:20 pm:
Speaker: Bern Youngblood, University of Minnesota
Subject: Temperature dependence of two-level noise in magnetic particles

Tuesday, May 6th 2014
12:20 pm:
There will be no sack lunch seminar this week.

Tuesday, May 20th 2014
12:20 pm:
Speaker: Mun Chan, University of Minnesota
Subject: The cuprate phase-diagram: insights from electrical transport and neutron scattering

Tuesday, September 2nd 2014
Speaker: Mike Veit, University of Minnesota
Subject: Transport Measurements in the Cuprate Superconductor HgBa2CuO4+δ

Tuesday, September 9th 2014
Speaker: Qianhui Shi, University of Minnesota
Subject: Strongly anisotropic transport in a Ge/SiGe quantum well in tilted magnetic fields

Tuesday, September 16th 2014
Speaker: Samuel Ducatman, University of Minnesota
Subject: Magnetic order of FeTe Compounds

Tuesday, September 23rd 2014
Speaker: Changjiang Liu, University of Minnesota
Subject: Sensitive detection of electron spins in FM/n-GaAs heterostructures using ferromagnetic resonance

Tuesday, September 30th 2014
Speaker: Tobias Gulden, University of Minnesota
Subject: Instanton calculus without equations of motion: semiclassics from monodromies of a Riemann surface

Tuesday, October 7th 2014
There will be no sack lunch seminar this week.

Tuesday, October 14th 2014
To be announced.

Tuesday, October 21st 2014
Speaker: Zvie Razieli, University of Minnesota
Subject: Composite Silicon Thin Films for Particle Detectors and Solar Cells

Tuesday, October 28th 2014
Speaker:  Abdul Malmi-Kakkada, University of Minnesota
Subject: Dislocation Mobility and Anomalous Shear Modulus in Quantum Crystals

Tuesday, November 4th 2014
12:20 pm:
Speaker: Markus Mueller, ICTP Trieste
Subject: Many-body localization without quenched disorder
NOTE: Change of location for this week only.

We explore the possibility and conditions under which translationally invariant quantum many body systems undergo a genuine glass transition, at which ergodicity and translational invariance break down spontaneously. In such circumstances quantum memory can arise, since large scale equilibration is prevented. In contrast to analogous classical systems, where the existence of such ideal glass transition remains a controversial question, a genuine phase transition is predicted in the quantum regime. This ideal quantum glass transition can be regarded as a many body localization transition due to self-generated disorder.

Faculty Host: Boris Shklovskii

Tuesday, November 11th 2014
Speaker: Yahor Savich, University of Minnesota
Subject:  Density of states for a single Abrikosov vortex in disordered media.

Tuesday, November 18th 2014
Speaker: Andrew Galkiewicz, University of Minnesota
Subject: Domain wall dynamics in the thermally activated regime

Tuesday, November 25th 2014
Speaker: Han Fu, University of Minnesota
Subject: Anomalously large capacitance in a carbon nanotube device

Tuesday, December 2nd 2014
Speaker: Yuriy Sizyuk, University of Wisconsin-Madison
Subject: Magnetism in multi-orbital systems with strong spin-orbit coupling.

Tuesday, December 9th 2014
There will be no seminar this week.

Tuesday, December 16th 2014
Speaker: Alberto Hinojosa Alvarado
Subject: Gap structure in Fe-based superconductors with accidental nodes

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