Electron–phonon coupling and superconductivity in a 2D Tl–Pb compound on Si(111)

Abstract

A first principles investigation of the electron–phonon interaction and phonon-mediated pairing strength in a Si(111) supported single-layer Tl–Pb compound reveals strong variations with electronic surface bands and binding energy.

Gold Interlayer Promotes Superconductivity in Single and Double Atomic Pb Layers on Si(100)

“…In particular, it was found that a single-atom-thick metal film of Pb on Si(111) (so-called striped incommensurate (SIC) phase with 1.33 monolayers of Pb) possesses superconducting properties, ,− albeit with the critical temperature T c lower than that for the bulk lead, i.e., 1.1–1.83 K versus 7.2 K. It appears that the number of the examples for superconducting single-atom-layer films is very limited. Besides the above-mentioned Pb/Si(111) system, the other examples are a few Tl–Pb compounds on Si(111) and Ge(111) surfaces − and a Sn layer on B-passivated Si(111) surface . In contrast, the list of the double-atom-layer superconductors was proved to be more extended.…”