Exciton-enhanced superconductivity in monolayer films of aluminum

Junhui Cao; Alexey Kavokin

doi:10.1103/vhs1-59z7

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Exciton-enhanced superconductivity in monolayer films of aluminum

Junhui Cao, Alexey Kavokin

DOI 10.1103/vhs1-59z7 · Physical Review B

T1

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Abstract

The BCS theory has achieved widespread success in describing conventional superconductivity. However, when the length scale reaches the atomic limit, the reduced dimensionality may lead to the quantum breakdown resulting in unpredictable superconducting behaviors. It has been experimentally evidenced that the critical temperature is strongly enhanced in the monolayer films of FeSe/STO and epitaxial aluminum. Here, we propose the exciton mechanism of superconductivity as a possible reason for the enhanced superconductivity in hybrid superconductor-semiconductor structures. The exciton-induced Cooper pairing may lead to the larger energy gaps and higher critical temperatures as compared to those caused by the phonon induced superconductivity. A detailed comparison of the theory and experimental results reveals the possibility of exciton-induced superconductivity in thin films of aluminum near the monolayer limit.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown