CTQM Theory Colloquium
First Laboratory Bounds on Ultralight Dark Photon Dark Matter from Precision Atomic Spectroscopy
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.
Non Reciprocal Phase Transitions
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?
Some gauge theory amplitudes from chiral correlators
This seminar is ONLINE only.
Nonabelian Hall conductance in general dimensions as an invariant of the interacting ground state wavefunction
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).
Relativistic Wind Farm Effect: Possibly Turbulent Flow of a Charged, Massless Relativistic Fluid in Graphene
Abstract: At low Reynolds numbers, the wind flow in the wake of a single wind turbine is generally not turbulent. However, turbines in wind farms affect each other’s wakes so that a turbulent flow can arise. In the present work, an analogue of this effect for the massless charge carrier flow around obstacles in graphene is outlined.
Electrical probes of non-Abelian spin liquids
Abstract: Recent thermal-conductivity measurements evidence a magnetic-field-induced non-Abelian spin liquid phase in the Kitaev material α-RuCl3. In this talk, I will explain how we leverage fermion condensation to propose a series of measurements for electrically detecting the hallmark chiral Majorana edge states and bulk anyons in the spin-liquid phase -- despite the fact that α-RuCl3 is a good Mott insulator.