When molecules are coupled to an optical cavity, new light–matter hybrid states, so-called
polaritons, are formed due to quantum light–matter interactions. With the experimental …

Gauge freedom in quantum electrodynamics (QED) outside of textbook regimes is reviewed.
It is emphasized that QED subsystems are defined relative to a choice of gauge. Each …

The multipolar Hamiltonian of quantum electrodynamics is extensively employed in
chemical and optical physics to treat rigorously the interaction of electromagnetic fields with …

We develop a theory of cavity quantum electrodynamics for a 2D electron gas in the
presence of Rashba spin-orbit coupling and perpendicular static magnetic field, coupled to …

The loss of gauge invariance in models of light-matter interaction which arises from material
and photonic space truncation can pose significant challenges to conventional quantum …

We present three schemes to go beyond the electric-dipole approximation in x-ray
absorption spectroscopy calculations within a four-component relativistic framework. The …

We develop a theory of cavity quantum electrodynamics for a two-dimensional electron gas
in the presence of Rashba spin-orbit and Zeeman couplings and perpendicular magnetic …

Abstract Systems of interacting charges and fields are ubiquitous in physics. Recently, it has
been shown that Hamiltonians derived using different gauges can yield different physical …

For over six decades, quantum electrodynamics (QED) in multipolar form has been an
invaluable tool for understanding quantum-scale atomic and molecular interactions …

We develop in this work a qualitative quantum electron transport model, in the strong light-
matter coupling regime under dipole approximation, able to capture polaritonic signatures in …