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Vector-like quarks (VLQ) that couple preferentially to third-generationStandard Model (SM) quarks are a well-motivated extension of the SM, whichcould solve in particular the hierarchy problem. While VLQs can be produced inpairs via the strong interaction at the LHC, the cross section for singleproduction may be larger than the pair production cross section for VLQ massesabove the current exclusion limits. An overview of the searches for the singleproduction of VLQs at the ATLAS experiment that use data taken at acentre-of-mass energy of 13 TeV, corresponding to up to 79.8 fb$^{-1}$, ispresented. Vector-like top quarks are searched for in the decay channel$T\rightarrow Wb$ and in the decay channel $T\rightarrow Zt$ with the $Z$ bosondecaying to two charged leptons. Vector-like bottom quarks are searched for inthe decay channel $B\rightarrow Hb$ with the Higgs boson decaying to twophotons. No significant excess over the SM prediction is found and 95% CLexclusion limits are set on the single production of VLQs as a function oftheir mass and coupling to SM quarks.

Overview of searches for single production of vector-like top and bottom quarks with the ATLAS experiment at 13 TeV