CTQM Theory Colloquium

How strong can the electron-phonon interaction in metals be?

When
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Lunch will be provided at 12:00pm, so please come early to eat mingle and eat lunch before the talk begins.

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Abstract: I’ll show that there exists a fundamental upper limit on the electron-phonon coupling strength in metals. This, in turn, implies an upper bound on the superconducting Tc. I’ll compare these bounds with new and old experimental data and ague that our theory explains several previously poorly understood experiments, such as the observation of metastable high-temperature superconductivity in FeSe.

First Laboratory Bounds on Ultralight Dark Photon Dark Matter from Precision Atomic Spectroscopy

When
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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.

 

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