News

12th annual STEM Forum to feature leaders from across education, industry and government

February 15, 2019 • Categories: News

The forum will take place from 8:30 a.m. to 2:30 p.m. Feb. 23 (Saturday) at Jordan Hall of Science at the University of Notre Dame.

Garg brings the science of stars to Europe

January 23, 2019 • Categories: News

Notre Dame Professor and Nuclear Physicist Umesh Garg spent last semester as a visiting faculty member at the London Global Gateway, and no one could accuse him of taking it easy. In three short months, Garg was invited to give ten talks on his research in five different countries, including Sweden, Italy, and Hungary. The traveling didn’t stop with Europe, he went to a conference in South Africa and even managed to fit an experiment in Japan into his schedule.

Bardayan re-elected to FRIB User Organization Executive Committee

January 22, 2019 • Categories: News

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Prof. Dan Bardayan, Department of Physics, has been re-elected to the User Organization Executive Committee for the Facility for Rare Isotope Beams (FRIB) at Michigan State University. The goals of the Users’ Organization are to work towards the realization and timely construction of FRIB, to act as an advocate for the needs of the FRIB user community, to articulate and promote the scientific case for rare-isotope science, and to advocate for rare isotope science in the USA.

Elite group of students selected to advance research in energy at Notre Dame

January 16, 2019 • Categories: News


The Center for Sustainable Energy at Notre Dame (ND Energy) has selected 11 students to receive 2019 fellowships in energy research at the University of Notre Dame. Awards are granted to students who demonstrate high academic achievement and have a profound interest in addressing the most critical energy challenges facing the world today. Research projects are submitted in collaboration with ND Energy affiliated faculty with project goals focused on supporting the mission to advance energy-related research at Notre Dame. Students use their awards for stipends, laboratory supplies, and travel to present their research results at a national conference. Funding for these competitive awards is made possible through the generosity of University alumni and their families.…

NDnano offers summer research fellowships for undergraduates; apply by February 6

January 14, 2019 • Categories: News

Stephen Bauer Mark Etzelmueller 2018 NURF2018 NDnano fellowship recipients Mark Etzelmueller (Notre Dame) and Stephen Bauer (Purdue) worked with Professor Tom O’Sullivan on the development of microimplants for deep tissue optical sensing.…

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Events

Mon Feb 18, 2019

Nuclear Physics Seminar: Dr. Areg Danagoulian, MIT

4:00 PM - 5:00 PM
184 Nieuwland Science Hall

Nuclear Disarmament Verification via Resonant Phenomena

Prof. Areg Danagoulian
Massachusetts Institute of Technology

Hosted by Prof. Aprahamian

Posted In: Nuclear Seminar

Tue Feb 19, 2019

Astrophysics Seminar: Prof. Evan O'Connor, Stockholm University

12:30 PM - 1:30 PM
184 Nieuwland Science Hall

Core-Collapse Supernovae from 1D to 3D

Prof. Evan O'Connor
Stockholm University

Core-Collapse supernovae are triggered by the implosion and subsequent explosion of the iron core in an evolved massive star. Since the core is shrouded from us by the overlying layers of the star, numerical simulations (and the odd neutrino detection of a Galactic supernova) are our best look into this extreme engine that powers one of the most energetic events in the Universe. Nature is 3D, and it is critical to simulate core-collapse supernovae in three dimensions because of the important hydrodynamic instabilities that can be present, however they are computationally expensive. With 2D models, we now starting to be able to perform systematic studies across a range of stars, and in 1D codes we are able to achieve excellent agreement between otherwise completely independent codes. In this talk I will present a global comparison in 1D between six core-collapse codes, the beginnings of a systematic study of core-collapse in 2D, and simulations where we explore fundamentally 3D phenomena.

Posted In: Astrophysics Seminar

Physics Colloquium: Dr. Ashley Cook, UC Berekely

4:00 PM - 5:00 PM
118 Nieuwland Science Hall

Magnetic Weyl and Dirac Kondo semimetal phases in heterostructures

Dr. Ashley Cook
Postdoctoral Researcher
UC Berkeley

A key challenge of modern condensed matter physics is characterization of topologically non-trivial phases of matter - those phases of matter with signatures unaffected by sufficiently small perturbations - and their relationships to one another. An important branch of this work is characterization of correlated topological phases of matter, including study of topological Kondo phases of matter and the fractional quantum Hall effect among other phenomena. In this work, we extend the set of topologically non-trivial phases of matter and their relationships to one another by studying layered three-dimensional heterostructures in which two types of Kondo insulators are stacked alternatingly. One of them is the topological Kondo insulator SmB6, the other one an isostructural Kondo insulator AB6, where A is a rare-earth element, e.g., Eu, Yb, or Ce. We find that if the latter orders ferromagnetically, the heterostructure generically becomes a magnetic Weyl Kondo semimetal, while antiferromagnetic order can yield a magnetic Dirac Kondo semimetal. We detail both scenarios with general symmetry considerations as well as concrete tight-binding and ab-initio calculations and show that type-I as well as type-II magnetic Weyl/Dirac Kondo semimetal phases are possible in these heterostructures. Our results demonstrate that Kondo insulator heterostructures are a versatile platform for design of strongly correlated topological semimetals.

Posted In: Colloquia

Our Universe Revealed: Prof. John LoSecco

7:00 PM - 8:00 PM
101 Jordan Hall of Science

The History of Supernova Neutrinos

Prof. John LoSecco
Department of Physics, University of Notre Dame

Many physics concepts like relativity and quantum mechanics emerged as theories during the mid 19th to the late 20th century. Join us as we discuss the evolution of astrophysics from this period and how that enabled us to develop an understanding of energy production in stars and the end point of stellar evolution.…

Posted In: Special Lectures and Events

Thu Feb 21, 2019

Physics Colloquium: Dr. Chao-Ming Jian, Kavli Institute for Theoretical Physics, UC Santa Barbara

4:00 PM - 5:00 PM
118 Nieuwland Science Hall

Generalized Lieb-Schultz-Mattis constraints on phases of quantum magnets

Dr. Chao-Ming Jian
Kavli Institute for Theoretical Physics
UC Santa Barbara

Quantum magnetic systems with a large number of spins often enable the emergence of a great variety of interesting phases at zero temperature. Yet, there are fundamental constraints on the infrared behavior of quantum magnets from the ultraviolet data encoded in the microscopic lattice of spins. As the first and the most well-known example, the Lieb-Schultz-Mattis (LSM) constraint forbids trivial phases from arising in certain quantum magnets with SU(2) spin rotation and the lattice translation symmetries. As an important experimental consequence, it enables the confirmation of exotic phases like quantum spin liquids, whose intrinsic properties are often hard to probe directly, through the examination of the absence of spontaneous symmetry breaking which is more accessible with standard spectroscopy measurements. In this talk, we will present a new topological perspective of the LSM constraint. We will show how the LSM constraint is related to the constraints on the surface modes of symmetry-protected topological states. Using this relation, we will discuss a large class of generalizations of the LSM constraint incorporating different space groups (including both translations and point group symmetries) and different spin symmetries. The range of applicability of such generalized LSM constraints is vastly extended compared to the original version. We will also discuss how the generalized LSM constraints enforce the “exotic-ness” of continuous phase transitions in quantum magnets.

Posted In: Colloquia

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