Events

SBQMI hosts numerous academic and other events throughout the year. Please search by audience or event type, or enter a keyword, to find events of interest to you.

If you are interested in inviting our faculty as keynote speakers at your event, or are a school group interested in visiting our labs, please contact us to submit your request.

Investigating the Role of Disorder, Electron Concentration, and Lattice Compression in Uranium-based Heavy Fermion Systems

25 May2017

Speaker: Eteri Svanidze, McMaster University

Time: Thu, 2017-05-25 14:00 - 15:00

Location: Hennings 318

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  • Student

Non-Fermi-liquid scattering rates, anomalous band dispersions, and Hund’s metal behavior in iron-based superconductors – an ARPES study

25 May2017

Speaker: Jorg Fink, Leibniz Institute for Solid State and Materials Research Dresden, Max Planck Institute for Chemical Physics of Solids, Dresden Institute of Solid State Physics, Dresden University of Technology

Time: Thursday, May 25 at 4:00 PM

Location: AMPEL 311

Unconventional/high temperature superconductivity (SC) is observed in heavy fermion systems, cuprates, molecular crystals, and ferropnictides close to a point in the phase diagram where, as a function of a control parameter such as pressure, chemical pressure, or doping, the antiferromagnetic order is suppressed. A widespread view is that at this point, which is called a quantum critical point, strong...

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Magneto-structural phase transitions in epitaxial FeRh films: Insights from structural and magnetic microscopy

24 May2017

Speaker: David Keavney, Argonne National Laboratory

Time: Wednesday May 24 at 11:00 AM

Location: AMPEL 311

In materials where structural, magnetic, or electronic degrees of freedom are coupled, rich phase diagrams and potentially useful driven phase transitions can be the result. One such material is the ordered alloy Fe50Rh50, which displays a magneto-structural phase transition at ~375 K. This transition is characterized by a ~1% lattice expansion and a flip from the low temperature antiferromagnetic...

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Dopants and Charge Carriers in Colloidal Quantum Dots

18 May2017

Speaker: Daniel R. Gamelin, Department of Chemistry, University of Washington

Time: Thu, 2017-05-18 14:00 - 15:00

Location: Hennings 318

The physical properties of inorganic crystalline materials can be dramatically transformed by controlled introduction of impurities or other defects, without which most semiconductor technologies including transistors, diodes, and solar cells would not be possible. The development and characterization of high-quality doped inorganic crystals has consequently been a perennial research frontier. This talk will describe some of our group’s recent...

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New Frontiers In Nonlinear Optics: Harnessing Photon-Phonon Interactions In Nanoscale Integrated Circuits

20 Apr2017

Speaker: Prof. Benjamin Eggleton, ARC Laureate Fellow, School of Physics, University of Sydney / Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS)

Time: Thursday April 20, 2017 @ 2:00 pm

Location: AMPEL 311

Abstract

One of the surprises of nonlinear optics – the field of optics with high intensity lasers – is that light may interact strongly with sound, the most mundane of mechanical vibrations. Intense laser light literally “shakes” the glass in optical fibres, exciting acoustic waves (sound) in the fibre. Under the right conditions, it leads to...

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Hidden phases in quantum materials revealed at a surface

12 Apr2017

Speaker: Dr. Jisun Kim, Louisiana State University

Time: Wednesday April 12th, 2:00pm - 3:00pm

Location: AMPEL 311

The last decade has seen extensive experimental and theoretical efforts to understand the physical properties of complex materials that exhibit strong coupling of electron, spin, lattice and orbital degrees of freedom. By tuning external parameters like temperature, pressure, magnetic field, and doping concentration, one can alter the delicate balance between these degrees of freedom, uncovering new phases. Creating a...

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Is LiNiO2 a mixed-valent system?

10 Apr2017

Speaker: Kateryna Foyevtsova

Time: Monday April 10th, 2017 - 11:15 AM

Location: AMPEL 311

The layered nickel oxide LiNiO2 is well known as a promising cathode material for rechargeable Li-ion batteries.

Yet, despite the great technological appeal and the decades of intense research, some of its basic properties remain poorly understood.

One such puzzling property of LiNiO2 is the apparent absence of a cooperative Jahn-Teller distortion of the NiO6...

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Harnessing structural complexity to engineer new multifunctional oxides

07 Apr2017

Speaker: Beth Nowadnick

Time: Friday April 7th, 2017 - 10:00 AM - 11:00 AM

Location: AMPEL 311

Complex oxides exhibit an incredible diversity of properties ranging from ferroelectricity and ferromagnetism to unconventional superconductivity. In addition, they are promising candidates for applications spanning from data storage to battery technology. Controlling the interplay between the microscopic electronic, spin, orbital, and lattice degrees of freedom in oxides by manipulation of their structural and chemical complexity is a central challenge....

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From the density functional theory to the model Hamiltonian studies on the magnetic skyrmion in MnSi and MnGe

07 Apr2017

Speaker: Hongchul Choi

Time: Friday April 7th, 2017 - 4:00pm - 4:30pm

Location: AMPEL 311

Since I came to Los Alamos, I have studied the magnetic skyrmion, performing the density functional theory (DFT)calculation and model Hamiltonian studies from the DFT inputs. This time I will summarize my work on the skyrmion. As a topologically stabilized spin object, the skyrmion shows more than several tens nanometers of a collective spin texture in magnetic materials. This...

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Probing and modifying the chemical and magnetic properties of single atoms and molecules

05 Apr2017

Speaker: Zsolt Majzik, IBM Research-Zurich Switzerland

Time: Wednesday April 5th, 2017, 2:00pm - 3:00pm

Location: AMPEL 311

I will prove you that nc-AFM and STM is a powerful tool for resolving and modifying the structure of molecules at the atomic scale. Advances in scanning probe microscopy opened new routes for studying highly reactive compounds. In particular, I will focus on the synthesis and characterization of conjugated systems containing radicals. Until now, the fundamental analyses of these...

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