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Lectures Calendar:

Spring 2021

Jan 14, 2021

Higher-order topological phases of matter

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Wladimir Benalcazar (Penn State University)Host: Lewis Ford

Topological phases of matter are low-temperature quantum phases that exhibit robust quantized transport properties and anomalous states at their boundaries. In this colloquium, I will describe the newly discovered family of “higher-order topological phases”, characterized by anomalous boundary properties of at least two dimensions less than ... read more  »

Jan 15, 2021

A Wannier center perspective on higher-order topological insulators

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Wladimir Benalcazar (Pennsylvania State University)

In the presence of crystalline symmetries, certain topological insulators present a filling anomaly: a mismatch between the number of electrons in an energy band and the number of electrons required for charge neutrality. This seminar will show how a “corner-induced filling anomaly” is at the core of the bulk-boundary correspondence of hig... read more  »

Jan 21, 2021

The magic of twisted bilayer graphene with spin orbit coupling

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Alexandra Thomson (California Institute of Technology)Host: Lewis Ford

When two graphene sheets are stacked offset by the ‘magic’ twist angle, the bands become incredibly flat, allowing interactions to dominate. Depending on filling and sample details, remarkably, superconductivity and various other correlated phenomena are observed in this system. The importance of the `magic’ angle, however, has recently been chall... read more  »

Jan 22, 2021

Magic-angle twisted bilayer graphene at charge neutrality: interactions and disorder

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Alex Thomson (Caltech)

Magic-angle twisted bilayer graphene at charge neutrality: interactions and disorder Stacking two graphene layers twisted by the ‘magic angle’ 1.1º generates flat energy bands, which in turn catalyzes various strongly correlated phenomena depending on filling and sample details. While this system is most famous for the superconducting and insulati... read more  »

Jan 25, 2021

Ivan Borzenets headshot

Superconducting Van der Waals Heterostructures As a Quantum Information Platform

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Ivan Borzenets (City University of Hong Kong)Host: Lewis Ford

The field of Quantum Information Systems (QIS) represents the current scientific and technological frontier, which promises to harness the quantum notions of coherence and entanglement and to revolutionize the world of computing and communications. There are several solid-state platforms used for the study and applications of quantum systems. Most of th... read more  »

Jan 26, 2021

Evidence of Kondo Screening Cloud of Micron Lengths

3:30 pm – 4:30 pm (CDT)Streaming Live

Speaker: Ivan Borzenets (City University of Hong Kong)

The Kondo effect, known as the archetype of many-body correlations, arises from the interaction between a localized magnetic moment and surrounding conducting electrons. Advances of nanotechnology allow us to study the Kondo effect for a single magnetic impurity confined in a semiconductor quantum dot in contact with electron reservoirs. This developmen... read more  »

Jan 28, 2021

Universal Dynamics Far From Thermodynamic Equilibrium

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Joaquin Rodriguez-Nieva (Stanford University)Host: Lewis Ford

Quantum matter away from thermodynamic equilibrium can host rich classes of dynamical phenomena that have no equilibrium analogue. Characterizing such phenomena remains one of the most fundamental challenges in theoretical physics. Although the notion of universality has been a central pillar in the characterization of equilibrium phases of matter, its ... read more  »

Jan 29, 2021

Universal decay of spin spiral order in the Heisenberg model

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: Joaquin F. Rodriguez-Nieva (Stanford)

Characterizing the mechanisms responsible for the breakdown of phase coherence in quantum systems is a fundamental problem with broad implications in quantum science and technology. In this talk, I describe the mechanisms of dephasing and relaxation of spin spirals in the Heisenberg model. In the first part of my talk, I will discuss a novel mechanism t... read more  »

Feb 1, 2021

The Colourful Past and Dark Side of Galaxies Unveiled Through Population-dynamics of Their Stars

11:30 am – 12:30 pm (CDT)

Speaker: Glenn van de Ven (University of Vienna)Host: Jonelle Walsh

Driven by gravity, galaxies continuously grow through accretion of smaller systems. Stellar streams are nice illustrations of this hierarchical build-up, but the accreted stars quickly disperse. I will present advanced dynamical models that can convert the observed positions and velocities of stars to phase-space quantities like energy and angular momen... read more  »

Feb 5, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Feb 8, 2021

Dance of the Milky Way and the LMC

11:30 am – 12:30 pm (CDT)Streaming Live

Speaker: Denis Erkal (University of Surrey)Host: Jonelle Walsh

The LMC is the largest satellite of our Galaxy and has a total mass roughly 1/6th that of the Milky Way. In this talk, I will review the multiple lines of evidence for the LMC being so massive and then focus on the substantial effect it has on our Galaxy. In particular, I will discuss its effect on stellar streams, the stellar halo, and orbits of satel... read more  »

Feb 12, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Feb 19, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Feb 26, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Mar 5, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Mar 12, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Mar 16, 2021

An indirect search for 12C+12C resonances

12:00 pm – 1:00 pm (CDT)Streaming Live

Speaker: Philip Adsley (University of Witwatersrand)Host: Dan Melconian

The 12C+12C fusion reaction is of great astrophysical importance, influencing the behaviour of superbursts, type Ia supernovae and the s-process in massive stars. Direct measurements at higher energies show resonance-like structures which make extrapolation of the cross section to low energies difficult, while direct measurements at astrophysical energi... read more  »

Mar 18, 2021

Detecting beta-delayed neutron emission using recoil-ion spectroscopy

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Gemma Wilson (Louisiana State University and Argonne National Laboratory)Host: Dan Melconian

Beta-delayed neutron (βn) emission is a process in which a neutron is emitted after beta decay, and is viable in many neutron-rich nuclei. This decay process affects broad areas of physics, from stellar nucleosynthesis to nuclear reactors. The lack of experimental βn data is being addressed with experimental efforts at radioactive ion beam facilities ... read more  »

Mar 19, 2021

Spring Break

4:00 pm – 5:00 pm (CDT)

Speaker: TBA

Mar 22, 2021

Extragalactic Archaeology: Galaxy Formation and Nucleosynthesis

2:45 pm – 3:45 pm (CDT)Streaming Live

Speaker: Evan Kirby (California Institute of Technology)Host: Casey Papovich

Galactic archaeology is the use of the velocities and abundances of stars to learn about the history of galaxy formation and nucleosynthesis.  I will tell two stories of extra-galactic archaeology with two different groups of elements: alpha elements and the iron peak.  First, I will present detailed abundances of individual stars in the dwarf satell... read more  »

Mar 22, 2021

Hoff headshot

There and Back Again: From Isomers to Isospin

4:15 pm – 5:15 pm (CDT)Streaming Live

Speaker: Daniel Hoff (University of Massachussetts at Lowell)Host: Dan Melconian

The nuclear landscape provides a wide expanse of nuclear systems to study, from light to heavy nuclei across the valley of stability. Each region of the nuclear landscape provides a diverse set of nuclear phenomena to explore, and I will share some of my research from light to heavy systems. Starting in lighter nuclei, I will discuss a reaction mechanis... read more  »

Mar 25, 2021

Physics of Nuclei – Isotopes to Stars

10:00 am – 11:00 am (CDT)Streaming Live

Speaker: Mansi Saxena (Ohio University)Host: Dan Melconian

Atomic nuclei play a fundamental role in the universe. Despite over a century of research, they still defy description from a basic nuclear theory. In particular, we do not understand how the structure of nuclei evolves across the nuclear landscape. Uncertainties in nuclear structure limit the fidelity with which we can describe astrophysical phenomena ... read more  »

Mar 25, 2021

Simulating the Growth of Galaxies and Black Holes in the Early Universe

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Sarah Wellons (Northwestern University)Host: Casey Papovich

As techniques have improved over the last decade, observations have peered deep into the Universe’s history and begun to glimpse galaxies which formed in the first few billion years after the Big Bang.  In this talk, I will discuss galaxy formation in the early Universe from a theoretical perspective, presenting results drawn from both large-volume... read more  »

Mar 26, 2021

OPEN

4:00 pm – 5:00 pm (CDT)Streaming Live

Speaker: TBA

Mar 29, 2021

Cosmology with Massive Neutrinos

4:15 pm – 5:15 pm (CDT)Streaming Live

Speaker: Jia Liu (University of California Berkeley)Host: Casey Papovich

Ghostly neutrino particles continue to bring surprises to fundamental physics, from their existence to the phenomenon of neutrino oscillation, which implies their nonzero masses. Their exact masses, among the most curious unknowns beyond the Standard Model of particle physics, can soon be probed by the joint analysis of upcoming cosmological surveys inc... read more  »

Mar 29, 2021

Boson collider for stress testing the Standard Model of elementary particles

2:45 pm – 3:45 pm (CDT)Streaming Live

Speaker: Aram Apyan (Fermilab)Host: Alexei Safonov

The standard model of elementary particles has been extremely successful in describing the building blocks of matter and their interactions. The observation of a Higgs boson at the Large Hadron Collider in 2012 presented a new paradigm of precision physics aiming at the investigation of the Higgs mechanism. Since that time, many decay modes of the Higgs... read more  »

Mar 30, 2021

The 22Ne(α,n)/(α,γ) branching ratio: Payoff after a long and winding road of research efforts

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Shuya Ota (Texas A&M University)Host: Dan Melconian

Payoff after a long and winding road of research efforts The slow neutron capture process (s-process) in AGB stars and massive stars forms about half of the elements heavier than Fe in the solar system. The impact of this process on chemical evolution in the Galaxy is thus tremendous. One of the keys to further constraining the process is determining no... read more  »

Mar 30, 2021

Quantum Gravity to Cosmological Inflation: a Journey through the Swampland

2:00 pm (CDT)Streaming Live

Speaker: Thomas Rudelius (University of California Berkeley)Host: Alexei Safonov

String theory is the only known mathematically consistent theory of quantum gravity, but it is infamously difficult to test experimentally. In this talk, we will discuss recent progress in bridging the gap between string theory and the real world, showing how a simple, well-supported statement inspired by string theory called the Weak Gravity Conjecture... read more  »

Mar 31, 2021

Where are the new discoveries at the Large Hadron Collider?

10:00 am – 11:00 am (CDT)Streaming Live

Speaker: James Beacham (Duke University)Host: Alexei Safonov

Why hasn't the Large Hadron Collider (LHC) discovered anything beyond the Higgs boson? Because you're thinking about particle physics in the wrong way. The LHC switched on in 2015 at 13 TeV, the highest energy ever used in a collider experiment and the beginning of a decades-long research program. Our first extensive look at this new data, in 2021, rev... read more  »

Apr 1, 2021

The Milky Way as the Frontier Laboratory for Cosmology

5:00 pm – 6:00 pm (CDT)Streaming Live

Speaker: Ana Bonaca (Harvard University)Host: Casey Papovich

The Milky Way is a stepping stone to understanding galaxies and the universe. Being a typical galaxy, inferring events in its history helps to develop the overall theory of galaxy formation. Further, since the effects of dark matter are observable in individual stars, the Milky Way provides an excellent setting for testing the nature of dark matter. So ... read more  »