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.

Observing a Scale Anomaly in Graphene : a Universal Quantum Phase Transition

03 Aug2017

Speaker: Eric Akkerman, The Technion, Israel

Time: Thursday, 2017-08-03 14:00 - 15:00

Location: Hennings 318

Scale invariance is a common property of our everyday environment. Its breaking gives rise to less common but beautiful structures like fractals. At the quantum level, breaking of continuous scale invariance is a remarkable exemple of quantum phase transition also known as scale anomaly. The general features of this transition will be presented at an elementary quantum mechanics level....

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  • Seminar
  • Student

New algorithms for exploring structure and dynamics of interfaces

31 Jul2017

Speaker: Multiple speakers

Time: Mon July 31st - Tue August 1st, 2017

Location: AMPEL 311

The goal of this workshop is to discuss strategies for extending the capabilities of current atomistic simulation techniques with applications to phenomena at interfaces. Molecular dynamics simulations, the universal workhorse of computational materials physics, cannot exceed timescales of order microseconds unless specialized hardware is used. How can we study materials phenomena on longer timescales such as diffusion, interface migration,...

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  • Student
  • Workshop

Short Course/Summer School: New algorithms for exploring structure and dynamics of interfaces

30 Jul2017

Speaker: Normand Mousseau, Danny Perez

Time: Sunday July 30, 2017, 9:00am

Location: AMPEL 311

This one-day short course provides an introduction to two strategies for simulating dynamics in materials on long timescales. The morning focuses on energy landscape exploration in combination with Monte Carlo methods, while the afternoon is dedicated to various strategies for accelerating molecular dynamics simulations.

Download the tutorial slides:

Danny Perez, LANL ...

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Low-temperature dynamics in non-linear Luttinger liquids

20 Jul2017

Speaker: Jesko Sirker

Time: Thu, 2017-07-20 14:00 - 15:00

Location: AMPEL 311

We generalize nonlinear Luttinger liquid theory to describe the dynamics of one-dimensional quantum critical systems at low temperatures. Analyzing density-matrix renormalization group results for the spin autocorrelation function in the XXZ chain we provide, in particular, direct evidence for spin diffusion in sharp contrast to the exponential decay in time predicted by conventional Luttinger liquid theory. Furthermore, we discuss...

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  • Student

Strong covalency and ligand holes, or how to make magnetic gold?

13 Jul2017

Speaker: Daniel Khomskii - Physikalisches Institut, Universitaet zu Koeln, Germany

Time: Thursday, July 13, 2017 @ 2:00pm

Location: AMPEL 311

In this talk, Professor Khomski will discuss some effects occurring in transition metal compounds with small or negative charge transfer gap and with large contribution of ligand (e.g. oxygen) holes. Special attention will be paid to the compounds of 4d and 5d elements. The apparent inversion of crystal field levels, as well as the tendency to spontaneous charge disproportionation...

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Edge states and exact zero modes in topological 1D quantum magnets

06 Jul2017

Speaker: Frédéric Mila, Ecole Polytechnique Fédérale de Lausanne, Switzerland

Time: Thu, 2017-07-06 14:00 - 15:00

Location: AMPEL 311

Motivated by recent STM experiments on chains of Co adatoms that have revealed a series of ground state level crossings as a function of an external magnetic field, and by their possible connection to Majorana edge states, I will discuss the coupling between edge states in two topological phases of 1D quantum magnets, the transverse field Ising model, and...

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Nonlinear and ultrafast optical investigations of correlated materials

04 Jul2017

Speaker: Hao Chu

Time: Tuesday July 4, 2017 @ 3:00 - 4:00 pm

Location: AMPEL 311

The spin-orbit coupled perovskite iridates Srn+1IrnO3n+1 share many similarities with the cuprate high-Tc superconductors in terms of their structural and electronic properties. For example, in single-layer Sr2IrO4, both a pseudogap as well as d-wave gap have been observed upon carrier doping. Using optical second harmonic generation rotational anisotropy (SHG-RA), I will discuss our discovery of a parity-odd multipolar order...

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Investigating Local Moments in Graphene in the Low Temperature Limit

27 Jun2017

Speaker: Dr. Silvia Luescher Folk

Time: Tuesday June 27, 2017 @ 11:00 am - 12:00 pm

Location: AMPEL 311

Graphene has been touted as a promising material for spintronics, due to its low intrinsic spin-orbit and hyperfine interactions. Over the past decade, however, it has become clear that conduction electron spins in most forms of graphene interact strongly with local magnetic moments. Unfortunately for spintronics applications, these interactions lead to rapid spin relaxation and dephasing. Well below 1Kelvin,...

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Determining a topological index from Landau level spectroscopy and magnetotransport in the quantum limit

08 Jun2017

Speaker: Badih A. Assaf, Department of Physics, Ecole Normale Supérieure, PSL, CNRS

Time: Thursday June 8, 2017 at 12:00 - 1:00 PM

Location: AMPEL 311

When a Dirac fermion system acquires an energy gap (or mass), it is said to have either trivial or non-trivial band topology depending on parity ordering of the conduction and valence band edges. A non-trivial material is generally identified via the observation of topological Dirac surface states dispersing in its bulk energy gap, and is attributed a non-zero topological...

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What’s Cooking?

05 Jun2017

Speaker: John Mitchell, Argonne National Laboratory

Time: Monday June 5, 2017 at 2:00 - 3:00 PM

Location: AMPEL 311

Correlated electron oxides remain a foremost area of research, principally because they host essentially the entirety of contemporary condensed matter science — superconductivity, magnetism, multiferroicity, topological protection, etc. In this talk I will discuss some recent work in a few areas of transition metal oxide materials physics: Specifically, I will describe our recent work on iridates, in particular magnetic...

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