Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons
- URL: http://arxiv.org/abs/2604.08635v1
- Date: Thu, 09 Apr 2026 17:06:42 GMT
- Title: Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons
- Abstract summary: Superradiant phase transitions (SRPTs) characterized by photon condensation and macroscopic matter polarization are forbidden in equilibrium for homogeneous fields by no-go theorems.<n>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.
- Score: 1.2844251695524058
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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 diamagnetic term unchanged, generating an additional DC coupling contribution. This drives the system across a critical threshold into a superradiant phase, characterized by photon condensation and Landau-level polarization in the ground state of the Floquet Hamiltonian. This quasiequilibrium approach offers a route to SRPTs distinct from driven-dissipative schemes.
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