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Amplifying the phonon signal in a semiconductor dark matter detector can beaccomplished by operating at high voltage bias and converting the electrostaticpotential energy into Luke-Neganov phonons. This amplification method has beenvalidated at up to |E|=40V/cm without producing leakage in CDMSII Ge detectors,allowing sensitivity to a benchmark WIMP with mass = 8GeV and cross section1.8e-42cm^2 assuming flat electronic recoil backgrounds near threshold.Furthermore, for the first time we show that differences in Luke-Neganov gainfor nuclear and electronic recoils can be used to discriminate statisticallybetween low-energy background and a hypothetical WIMP signal by operating attwo distinct voltage biases. Specifically, 99% of events have p-value<1e-8 fora simulated 20kg-day experiment with a benchmark WIMP signal with mass =8GeVand cross section =3.3e-41cm^2.

journal of low temperature physics

Low-Mass WIMP Sensitivity and Statistical Discrimination of Electron and  Nuclear Recoils by Varying Luke-Neganov Phonon Gain in Semiconductor  Detectors