Latest results on searches for dark matter candidates with the ATLAS experiment at the LHC

Supersymmetry (SUSY) is a theoretically attractive model as an extension of the Standard Model (SM). It introduces SUSY partners for all SM particles with a spin difference of $pm 1/2$ and solves the fine-tuning problem of the SM (stabilization of Higgs mass against radiative correction) in an elegant way. It also provides a natural candidate of dark matter when the lighest SUSY particle (LSP) is stable. However, since SUSY partners have not been observed at the same mass as SM particles, SUSY must be a broken symmetry at low energy. Several SUSY breaking mechanisms have been proposed which lead to different pheonomenology. One of the main goals of the Large Hadron Collider (LHC) is to discover SUSY and ATLAS~cite{Aad:2008zzm} is one of the general-purpose detector at the LHC designed to acheive this goal. The LHC started the operation at the center-of-mass energy of 7~TeV in March 2010. The ATLAS experiment has recorded an integrated luminosity of more than 1~fb~$^{-1}$ during 2010 and 2011 running periods and many analyses have been performed using 2010 data ($Lsimeq 35~$pb$^{-1}$) or the full 2011 data ($L>1$~fb$^{-1}$) . The latest results on searches for SUSY~cite{AtlasPublicResultsSusy} and other models beyond the SM~cite{AtlasPublicResultsExotics} performed in the ATLAS experiment will be reported.