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Lunch will be provided first and the talk will start at 12pm.
This is the second installment of the CU Phonon Club, a new group that focuses on making connections between different research teams on campus studying phonons.
The Parker Solar Probe spacecraft has traveled closer to the Sun than any other human-made object. It has measured in-situ magnetic fields, electric fields, thermal plasma, high energy particles, and interplanetary dust in the near-Sun solar wind. Most recently, it made the first in-situ measurements of the solar corona, dipping below the Alfven surface.
Abstract: Hot carriers in semiconductors are electrons and/or holes that have energies greater than carriers that reside at the top and bottom of the conduction and valence bands, respectively; the latter carriers are in equilibrium with the lattice and have a temperature equal to the lattice (ambient) temperature. Hot carriers are created in semiconductors upon the absorption of photons with energies greater than the bandgap. The excess energy above the bandgap energy is in the form of kinetic energy.
Abstract: Ultralight bosonic dark matter has come under increasing scrutiny as a dark matter candidate that has the potential to resolve puzzles in astronomical observation. I demonstrate that high-precision measurements of time variation in the frequency ratios of atomic transitions achieve leading sensitivity to ultralight vector portal dark matter at low masses. These bounds are the first laboratory-based bounds on this class of dark matter models. I discuss further measurements that could enhance sensitivity to ultralight dark photons.
Bernd Abel (Leipzig University) in cooperation with A. Spesyvyi, J. Žabka, M. Polášek, F. Postberg, and A. Charvat
Abstract: I will present our trapped-ion system with engineered competing dissipation channels, implemented independently on two ions of different specied co-trapped in the same potential well. We explore the phase diagram of the system, which is analogous to that of a (phonon) laser by precise control of the spin-oscillator couplings and the dissipative channels.
Abstract: Self-organized complex structures in nature, from hierarchical biopolymers to viral capsids and organisms, offer efficiency, adaptability, robustness, and multifunctionality. How are these structures assembled? Can we understand the fundamental principles behind their formation, and assemble similar structures in the lab using simple inorganic building blocks? What’s the purpose of these complex structures in nature, and can we utilize similar mechanisms to program new functions in metamaterials?
Lab Website: https://www.fitzpatrick-lab.org/
Synopsis: Works with Cryo-EM to understand the structural basis of neurodegeneration and memory (amyloid fibres) as well as understanding protein aggregation. The Fitzpatrick lab has worked extensively on Alzheimers and more recently with the homotypic fibrillization of TMEM106B using light microscopy and Cryo-EM.
Abstract: Space weather is largely caused by the activity of our Sun. Invisible yet powerful magnetic fields, created within the Sun, determine when and where the next solar eruption will happen. In this talk, I will discuss how advances in solar observations and data-driven models allowed scientists to understand flare magnetism in a lot more detail than ever before.
Abstract: Topological phases of matter, like fractional quantum Hall systems, can host anyon excitations with fractional exchange statistics and fractional electric charges. More generally, when topological phases with anyons have global symmetries, anyons can carry fractional quantum numbers under those symmetries.
Abstract: Planetary magnetic fields are ubiquitous in the Solar System. These fields are generated by the motion of an electrically conducting fluid within the interiors of the planets. For the Earth, turbulence in the liquid iron outer core has sustained the geomagnetic field for at least 4 billion years. Similar turbulent fluid systems are present in most planets, as well as stars. These flows are thought to be strongly influenced by system rotation (i.e.
Lab Website: https://www.colorado.edu/lab/cameron/
Synopsis: The Cameron lab works to understand the processes of bacterial metabolism, photosynthesis, and CO2 fixation with emphasis on cyanobacteria. The lab uses long-term time-lapse microscopy, quantitative image analysis, etc. to investigate the function and assembly of carboxysomes and other related microcompartments in single-cells and bacterial populations.
