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An energy threshold of (220+-10) eV was achieved at an efficiency of 50% witha four-channel ultra-low-energy germanium detector each with an active mass of5 g. This provides a unique probe to WIMP dark matter with mass below 10 GeV.With a data acquisition live time of 0.338 kg-day at the Kuo-Sheng Laboratory,constraints on WIMPs in the galactic halo were derived. The limits improve overprevious results on both the spin-independent WIMP-nucleon and thespin-dependent WIMP-neutron cross-sections for WIMP mass between 3-6 GeV.Sensitivities for full-scale experiments are projected. This detector techniquemakes the unexplored sub-keV energy window accessible for new neutrino and darkmatter experiments. Two appendices are included after Version-3 to addressquestions raised on trigger and selection efficiencies as well as other issues.

New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV