Physicists found a "loophole" in a law of nature to create a state of light and matter once thought impossible.
April 14, 2026
Original Paper
Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons
arXiv · 2604.08635
The Takeaway
By "shaking" atoms with a specific magnetic field, they bypassed "no-go" theorems that usually forbid matter from spontaneously emitting light in unison. This creates a "superradiant" phase that could lead to ultra-stable lasers and new types of quantum sensors.
From the abstract
Superradiant phase transitions (SRPTs), characterized by photon condensation and macroscopic matter polarization, are forbidden in equilibrium for homogeneous fields by no-go theorems. Here, we show that Floquet driving can circumvent this constraint in a Landau polariton system consisting of a two-dimensional electron gas coupled to a terahertz cavity in a DC magnetic field. An off-resonant AC magnetic field modulates the cyclotron frequency and light--matter coupling strength while leaving the