Anti-Stokes–Stokes Raman scattering of light from the excited Laughlin liquid

Abstract

An ensemble of neutral excitations is constructed experimentally in the Laughlin liquid at the electron filling factor 1/3. The excitations are found to induce a nonlinear optical response, manifested as a quadratic dependence of the reflection signal on the excitation power. The reported experimental results indicate that the observed effect is due to the anti-Stokes–Stokes scattering of light from the excited Laughlin liquid.