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Doping tin surface epitaxially grown on silicon, Sn/Si(111), with boron atomsyields the appearance of a superconducting (SC) phase below $T_c\sim 4-5$K.Even though the pairing mechanism remains unknown, experimental evidence ofchiral $d-$wave superconductivity has been recently reported, then ruling out aphonon-mediated pairing. Here we study theoretically the SC phase andsymmetries of the doped Sn/Si(111) within a $t-J$ model. We analyze thephoto-excitation of the system by intense THz pulses and show that thepolarization dependence of the induced current can distinguish betweendifferent symmetries of the SC gap, thus providing a novel experimental mean toinvestigate the spectroscopic features of the Sn/Si(111) across the SCtransition.

Unveiling the pairing Symmetry of the superconducting Sn/Si(111) via angle-resolved THz pump spectroscopy