Fig. 1: QO data.

a Field dependence of the TDO frequency after the heterodyne circuit at low temperature in the monolayer Hg1201 (blue line) and in the tri-layer Hg1223 at different doping levels (black and red line). b Oscillatory part of the TDO signal after removing a smooth background (spline) from the data shown in panel a. c Discrete Fourier analysis of the oscillatory part of the TDO signal shown in panel b.