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.

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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Field induced phase transition in one dimensional Heisenberg antiferromagnet model studed using density matrix renormalization group

31 Mar2017

Speaker: Peter Gustainis, Affleck group, UBC

Time: Fri, 2017-03-31 13:00 - 14:00

Location: Hennings 309

This presentation will examine the Heisenberg antiferromagnetic spin chain in one dimension (1D) with a crystal field splitting term and applied magnetic field term. We use theoretical techniques from quantum field theory and conformal field theory (CFT) to make predictions about the excitation spectrum for our model. We then use Density Matrix Renormalization Group (DMRG) umerical techniques to simulate...

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Constrained Path Monte Carlo: recent development and application

23 Mar2017

Speaker: Mingpu Qin

Time: Thursday March 23, 2017 at 2:00 pm

Location: Hennings 318

I will first give a brief introduction of the auxiliary field Quantum Monte Carlo (AFQMC) method. Then I will discuss the minus sign problem and the constrained path Monte Carlo (CPMC) ethod which was designed to attack the minus sign problem. Finally I will present our recent development, the self-consistent CPMC method and discuss the application of this method...

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New tools to simulate strongly correlated systems

03 Mar2017

Speaker: Norman Tubman

Time: Friday March 3rd, 2017 - 3:00 PM

Location: Hennings 304

Strongly correlated systems are some of the most difficult to simulate with electronic structure methods. The most widely used techniques, for simulating realistic materials, lose their predictive power when electron correlations are important. For example, there remain many open questions about the electronic properties of the high temperature superconducting cuprate materials.

Recent developed methods, that can simulate...

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  • Seminar
  • Student

Orbital and magnetic excitations in the spin-chain compound TiPO4

02 Mar2017

Speaker: Jochen Geck

Time: Thursday March 2, 2017 - 2:00 PM

Location: Hennings 318

We present high-resolution resonant inelastic x-ray scattering data as well many-body quantum chemistry calculations for the spin-chain compound TiPO4. This combined approach allows identifying the d-level electron configuration of Ti in this material, which is found to be at odds with canonical local ligand-field theory. Specifically, we find the ground state to be composed of an admixture of z2...

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  • Seminar
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