Single Top quark production cross section using the ATLAS detector at the LHC

We present single top quark production measurements stemming from the analysis of proton proton collision data collected by the ATLAS detector at the LHC. The fiducial and total inclusive $t$-channel cross sections, as well as the $Wt$ associated production cross section are determined with the full 8 TeV dataset, while the top quark-antiquark ratio in the $t$-channel is extracted using\\ 4.7 $\mathrm{fb^{-1}}$ data at 7 TeV. All the observed values, as well as the $|V_{tb}|$ element of the Cabibbo-Kobayashi-Maskava matrix directly measured within those analyses, are in agreement with the Standard Model predictions. We discuss, in addition, the limits set on exotic single top production at 8 TeV; this includes the search for flavor changing neutral currents in the $t$-channel, and for heavy $W'$ resonances in the s-channel.