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Probing low mass (sub-GeV -- few GeV) Weakly Interacting Massive Particle(WIMP) candidates of dark matter through WIMP-induced nuclear recoils in directdetection experiments requires use of detector materials consisting of low masstarget nuclei and low threshold energy. Here we explore the potential ofsuperheated liquid detectors (SLD) with a hydrogen containing liquid, namely,tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$) (b.p.~$-26.3^\circ\,$C), as thetarget material for probing low mass WIMPs. It is found that few-keV levelrecoil energy thresholds possible for bubble nucleation by WIMP-induced$^{12}$C and $^{19}$F recoils in C$_{2}$H$_{2}$F$_{4}$ SLDs operated atatmospheric pressure and gamma-ray insensitive temperatures of $T\, \lesssim\,35^\circ\,$C have the potential to allow WIMPs in the few-GeV mass range to beprobed at a WIMP-nucleon spin-independent cross section sensitivity levels (90%C.L.) better than $4.6\times 10^{-5}\,$pb at WIMP masses down to $\sim$ 4 GeVwith a total exposure of $\sim$ 1000 kg.day, provided that the ``thermodynamicefficiency" $\eta_{\rm T}$ that determines the bubble nucleation thresholds forthe recoiling nuclei in C$_{2}$H$_{2}$F$_{4}$ is $\sim$ 50% or higher.Sensitivity to sub-GeV WIMP masses generally requires the detector to besensitive to the WIMP-induced $^1$H recoils, which in turn requires thedetector to be operated at temperatures $T\gtrsim 50^\circ\,$C and $\eta_{\rmT}$ close to 100%. At such relatively high temperatures (at atmosphericpressure), however, the detector would be sensitive to background gamma rays.

Probing low-mass WIMP candidates of dark matter with tetrafluoroethane superheated liquid detectors