  Single-top production has been studied with the ATLAS detector using 0.7 fb-1
of 2011 data recorded at 7 TeV center-of-mass energy. The measurement of
electroweak production of top-quarks allows probes of the Wtb vertex and a
direct measurement of the CKM matrix element |V_tb|. It is also expected to be
sensitive to new physics such as flavor changing neutral currents or heavy W
production. The t-channel cross-section measurements are performed using both a
cut-based and neural network approach, while a cut-based selection in the
dilepton channel is used to derive a limit on the associated (Wt) production.
An observed cross-section of 90 +32 -22 pb (65 +28 -19 pb expected) is obtained
for the t-channel, which is consistent with the Standard Model expectation. For
the Wt production, an observed limit of < 39.1 pb (40.6 pb expected) is
derived, which corresponds to about 2.5 times the Standard Model expectation.
