Superconductor-insulator transition in an anisotropic two-dimensional electron gas assisted by one-dimensional Friedel oscillations: (Tl,Au)/Si(100)−c(2×2)
N. V. Denisov, A. V. Matetskiy, A. N. Mihalyuk, S. V. Eremeev, S. Hasegawa, A. V. Zotov, A. A. Saranin
DOI 10.1103/PhysRevB.100.155412 · Physical Review B
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Abstract
The recently found (Tl,Au)/Si(100)c(2×2) two-dimensional compound which possesses spin-split surface states with peculiar spin texture and strong band anisotropy was examined using low-temperature scanning tunneling microscopy and scanning tunneling spectroscopy observations and in situ four-probe transport measurements. Two types of the one-dimensional incommensurate Friedel oscillations were found to develop near the surface defects with the wavelengths corresponding to the nesting vectors of the (Tl,Au)/Si(100)c(2×2) Fermi surface. In transport measurements, samples show strong localization behavior when density of defects is sufficiently high. With low density of defects, the system demonstrates a metallic behavior with fingerprints of superconducting transition at estimated Tc=1.33K. Thus, the (Tl,Au)/Si(100)c(2×2) system hosts a combination of fascinating properties and effects, including one-dimensional Friedel oscillations, superconductivity, and a spin-split anisotropic Fermi surface, that opens an avenue for prospective investigations of the interplay of collective electronic phenomena in atomic layer material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Tl,Au)/Si(100)c(2x2) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.33 | Pressure not reported | unknown |
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