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We present systematic case studies to investigate the sensitivity of axionsearches by liquid xenon detectors, using the axio-electric effect (analogue ofthe photoelectric effect) on xenon atoms. Liquid xenon is widely considered tobe one of the best target media for detection of WIMPs (Weakly InteractingMassive Particles which may form the galactic dark matter) using nuclearrecoils. Since these detectors also provide an extremely low radioactivityenvironment for electron recoils, very weakly-interacting low-mass particles (<100 keV/c^2), such as the hypothetical axion, could be detected as well - inthis case using the axio-electric effect. Future ton-scale liquid Xe detectorswill be limited in sensitivity only by irreducible neutrino background(pp-chain solar neutrino and the double beta decay of 136Xe) in the mass rangebetween 1 and 100 keV/c^2. Assuming one ton-year of exposure, galactic axions(as non-relativistic dark matter) could be detected if the axio-electriccoupling g_Ae is greater than 10^-14 at 1 keV/c^2 (or $10^-13 at 100 keV/c^2).Below a few keV/c^2, and independent of the mass, a solar axion search would besensitive to a coupling g_Ae ~ 10^-12. This limit will set a stringent upperbound on axion mass for the DFSV and KSVZ models for the mass ranges m_A < 0.1eV/c^2 and < 10 eV/c^2, respectively. Vector-boson dark matter could also bedetected for a coupling constant alpha'/alpha > 10^-33 (for mass 1 keV/c^2) or> 10^-27 (for mass 100 keV/c^2).

Expected Sensitivity to Galactic/Solar Axions and Bosonic Super-WIMPs based on the Axio-electric Effect in Liquid Xenon Dark Matter Detectors