Cavity Floquet engineering.

ABSTRACT: Floquet engineering is a promising tool to manipulate quantum systems coherently. A well-known example is the optical Stark effect, which has been used for optical trapping of atoms and breaking time-reversal symmetry in solids. However, as a coherent nonlinear optical effect, Floquet engineering typically requires high field intensities obtained in ultrafast pulses, severely limiting its use. Here, we demonstrate using cavity engineering of the vacuum modes to achieve orders-of-magnitude enhancement of the effective Floquet field, enabling Floquet effects at an extremely low fluence of 450 photons/μm². At higher fluences, the cavity-enhanced Floquet effects lead to 50 meV spin and valley splitting of WSe₂ excitons, corresponding to an enormous time-reversal breaking,

SUBMITTER: Zhou L 

PROVIDER: S-EPMC11377740 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature