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We study QCD at finite density and low temperature by using the complexLangevin method. We employ the gauge cooling to control the unitarity norm andintroduce a deformation parameter in the Dirac operator to avoid thesingular-drift problem. The reliability of the obtained results are judged bythe probability distribution of the magnitude of the drift term. By makingextrapolations with respect to the deformation parameter using only thereliable results, we obtain results for the original system. We performsimulations on a $4^3\times 3$ lattice and show that our method works well evenin the region where the reweighting method fails due to the severe signproblem. As a result we observe a delayed onset of the baryon number density ascompared with the phase-quenched model, which is a clear sign of the SilverBlaze phenomenon.

Complex Langevin simulation of QCD at finite density and low temperature using the deformation technique