Extended Data Fig. 2: Peak fitting of the \({{\boldsymbol{\Delta }}}_{{\bf{m}}}^{0}\) mode at v = 1/3 in the RR geometry with θ = 25°.
From: Evidence for chiral graviton modes in fractional quantum Hall liquids
The measured \({\varDelta }_{{\rm{m}}}^{0}\) mode at resonance (black open dots) includes contribution from photoluminescence background. The red open dots show the \({\varDelta }_{{\rm{m}}}^{0}\) mode after subtracting smoothed photoluminescence background (the grey dashed line), which are fitted by a Lorentzian peak (the black line) with FWHM of 30 μeV. The combination (the red dashed line) of the fitted Lorentzian peak and photoluminescence background gives a remarkable match with the measured signals in the RR geometry. The relatively narrow peak width of this mode suggests wavevector conservation in the scattering process with q = k ≪ 1/lB, confirming its long-wavelength nature. PL, photoluminescence.
