CTQM Theory Colloquium

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.

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:

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

==========

Abstract:

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

Abstract:

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.

Abstract: The interaction between a peregrine falcon and a dove is visibly non-reciprocal. What happens to the well established framework of phase transitions in non-reciprocal systems far from equilibrium?

This seminar is ONLINE only.

Abstract: The long-wavelength response of a gapped many-body system in D spatial dimensions with a Lie group symmetry G to an external gauge field is believed to be described by a Chern-Simons action in dimension D+1. Since the coefficient of the Chern-Simons action is quantized, it is a topological invariant (i.e. is unchanged under deformations of the Hamiltonian which do not close the gap).