Inferring the pairing symmetry of the superconducting Sn/Si(111) via angle-resolved terahertz pump spectroscopy
Mattia Iannetti, Tommaso Cea, Cesare Tresca, Lara Benfatto, Gianni Profeta
DOI 10.1103/p357-5pth · Physical Review B
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Abstract
Doping tin surface epitaxially grown on silicon, Sn/Si(111), with boron atoms yields the appearance of a superconducting (SC) phase below Tc∼4−9K. Even though the pairing mechanism remains unknown, experimental evidence of chiral d−wave superconductivity has been recently reported, thus ruling out a phonon-mediated pairing. Here, we study theoretically the SC phase of the doped Sn/Si(111) within a t−J model investigating different symmetries of the order parameter. We analyze the photoexcitation of the system by intense terahertz pulses and show that the polarization dependence of the induced current can distinguish between different symmetries of the SC gap, thus providing an experimental means to investigate the spectroscopic features of the Sn/Si(111), and possibly to many other systems, across the SC transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn/Si(111) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | unknown |
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