Friday, November 15, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Ashley Perko, Dartmouth College

The standard paradigm for producing dark matter in the early universe is thermal production, which freezes out at a constant abundance when the interaction rate with the Standard Model becomes slower than the Hubble expansion.

Friday, November 8, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Lionel London, Massachusetts Institute of Technology

The years following the LIGO-Virgo collaboration’s September 14th, 2015 breakthrough detection of gravitational waves have been filled by marked advances in our ability to detect and infer the source parameters of merging binary black hole systems.

Friday, November 1, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Jim Connell, UNH

Science is a creative human endeavor.  It advances with new ideas. For experimentalists, the inspiration can range over all of human technology, sometimes seeming totally unrelated to the problem at hand. I will discuss examples from my career.

Friday, November 1, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Jim Connell


Friday, October 18, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Jiadong Zang, University of New Hampshire

Symmetry is a key to unlock exotic phenomena in condensed matter physics. Particularly in magnetic systems, the symmetry analysis enables deep understanding of magnetic ordering and electron transports. In this talk, I will give three examples showing how symmetry analysis can help understand and design magnetic materials of interest. First, I will show the prediction of giant perpendicular magnetic anisotropy (PMA) in iron monolayer on top of III-V nitride substrates. The magnitude of PMA is up to 50 meV, in contrast to 1meV in conventional Fe-based thin films.

Friday, September 13, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Jun Lin, Yunnan Astronomical Observatories, CAS, China

Magnetic reconnection is a ubiquitous process in the universe involved in the release/conversion of the magnetic energy in the magnetized plasma. It takes place in a large-scale CME/flare current sheet in the major solar eruption, which forms as a result of the loss of equilibrium in the coronal magnetic configuration at the beginning of the eruption. The loss of the equilibrium in the coronal magnetic configuration occurs at the Alfven time-scale of the coronal, so does the current sheet connecting the CME to the associated flare.

Tuesday, July 16, 2019 - 1:00pm to 2:00pm  ·  Colloquium
Dr. Dacheng Lin
A star wandering too close to a massive black hole (BH) can be pulled apart by the black hole's intense tidal force.
Monday, May 6, 2019 - 2:30pm to 5:00pm  ·  Colloquium
Friday, April 26, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Ben Hunt, Department of Physics, Carnegie Mellon University

The physics of superconductors in reduced dimensions — two in particular — is related to such varied phenomena as high-temperature superconductivity, topological superconductivity, and the paradigmatic quantum phase transition, the superconductor-insulator transition.

Friday, April 12, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Nandini Trivedi, Ohio State University

Within the Landau paradigm we define a phase or a state of matter by a local order parameter, as in crystals, magnets and superconductors. However, due to frustration generated by geometry and interactions, some materials do not order, even at the lowest temperatures, and enter a new state of matter called a quantum spin liquid.