1. L. Baudis, Phys. Dark Univ. 1, 94 (2012)
2. LUX Collaboration, D. S. Akerib et al., Phys. Rev. Lett. 116, 161301 (2016)
3. PandaX-II Collaboration, X. Cui et al., Phys. Rev. Lett. 119, 181302 (2017)
4. XENON Collaboration, E. Aprile et al., Phys. Rev. Lett. 123, 251801 (2019)
5. DarkSide Collaboration, P. Agnes et al., Phys. Rev. D 98, 102006 (2018)