News

Physicist Tsai, a high energy theorist, joins Notre Dame faculty

August 07, 2020 • Categories: News

Yuhsin Tsai, a high energy theorist, is joining the faculty this month in the University of Notre Dame’s Department of Physics.

General and Physics GRE scores not required for 2020/21 academic year graduate school applicants

July 15, 2020 • Categories: News

General and subject specific (physics) GRE tests will not be required for graduate student applications for the 2020/21 academic year. This decision was made in light of the ongoing COVID-19 pandemic, and the associated difficulties taking these test, in particular for international applicants.

The department will also review possible permanent changes to the GRE requirements. Recently, the value of the subject GRE test has been called into questions, and many programs have dropped the requirement altogether (see for example the recent article in Physics Today

Aprahamian appointed to JINR Scientific Council

July 06, 2020 • Categories: News

The Committee of Plenipotentiaries of the Governments of the Member States of the Joint Institute for Nuclear Research (JINR) has appointed Freimann Professor of Physics Ani Aprahamian as a new member of the JINR Scientific Council. Her appointment runs through the end of its mandate in March 2023.…

Gear treated with ‘forever chemicals’ poses risk to firefighters

June 24, 2020 • Categories: News

Graham Peaslee’s team tested more than 30 samples of used and unused PPE from six specialty textile manufacturers in the United States and found them to be treated extensively with PFAS or constructed with fluoropolymers, a type of PFAS used to make textiles oil and water resistant.

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Events

Nuclear Physics Seminar: Prof. Ani Aprahamian, University of Notre Dame

4:00 PM - 5:00 PM zoom

COVID-19 and the NSL

Prof. Ani Aprahamian
University of Notre Dame…

Particle Physics Seminar: Dr. Jack Setford, University of Toronto

4:00 PM - 5:00 PM zoom

Title TBA

Dr. Jack Setford
University of Toronto

Hosted by Prof. Tsai

Physics Colloquium: Prof. Stacy McGaugh, Case Western Reserve University

4:00 PM - 5:00 PM Online streaming

The Acceleration Scale in Galaxy Dynamics

Prof. Stacy McGaugh
Department of Astronomy
Case Western Reserve University

The flat rotation curves of spiral galaxies played an essential role in establishing the dark matter paradigm. There is more to the story: the amplitude of the flat rotation speed correlates with the mass that is observed in stars and gas (the Baryonic Tully-Fisher Relation). The dynamical surface density (including all mass) correlates with that of the stars alone (the Central Density Relation). The total radial force correlates with that predicted by the observed distribution of baryons (the Radial Acceleration Relation). These empirical relations are all connected by a common acceleration scale that is of order 1 Angstrom/s/s. Understanding the origin of this scale is central to solving the missing mass problem. …

Condensed Matter Seminar: Dr. Manohar Kumar, Aalto University, Finland

4:00 PM - 5:00 PM Online streaming

Dr. Manohar Kumar
Research Fellow
Department of Applied Physics
Aalto University, Finland

Particle collider in condensed matter physics for Anyons

Two-dimensional systems at low temperatures and at high magnetic field, can host exotic particles with elementary excitations carrying fractional charge e* = e/q such as in fractional quantum Hall effect 1 . These exotic particles are called anyons, whose quantum statistics are neither bosonic nor fermionic; instead they are predicted to obey fractional statistics 2 . The fractional charge of these anyons has been studied successfully using low frequency shot noise measurement 3,4 . However, no universal method for sensing them unambiguously exists 5 . Also, clear signature of the fractional statistics remains elusive. Here we exploited the Josephson relation of these anyonic states to determine the fractional charge of excited quasiparticles. The microwave photons emitted by voltage biased anyonic system obey the Josephson relation, like superconducting Josephson junction but with the charge q = e* rather than 2e. This provides    direct evidence of fractional charge in fractional quantum Hall effect 6 . Lastly, we also probed the fractional statistics in mesoscopic anyonic collider 7 . Our collision results explicitly extract the quantum phase of \phi = pi/3 for exchange of two anyonic quasiparticles with q = e/3. This is very first smoking gun result on fractional statistics of anyon. This collider geometry could be extended to perform ultimate braiding experiment to realized full potential of special kind of anyon called non-Abelian anyons in topological quantum computation.…

Nuclear Physics Seminar: August Gula & Shahina, University of Notre Dame

4:00 PM - 5:00 PM zoom

Progress in low energy nuclear reaction measurements

August Gula & Shahina