Two-dimensional Superconductors with Atomic-scale Thicknesses

TL;DR

This review discusses recent experimental advances in two-dimensional superconductors, highlighting various materials and phenomena arising from atomic-scale thicknesses and their unique physical properties.

Contribution

It provides a comprehensive overview of experimental progress across diverse 2D superconducting systems, emphasizing the physics of atomic-scale thicknesses.

Findings

Diverse 2D superconducting materials and structures are experimentally realized.

Unique phenomena due to two-dimensionality are identified and analyzed.

Insights into the physics of atomic-scale superconductors are discussed.

Abstract

Recent progress in two-dimensional superconductors with atomic-scale thicknesses is reviewed mainly from the experimental point of view. The superconducting systems treated here involve a variety of materials and forms: elemental-metal ultrathin films and atomic layers on semiconductor surfaces; interfaces and superlattices of heterostructures made of cuprates, perovskite oxides, and rare-earth metal heavy-fermion compounds; interfaces of electric-double-layer transistors; graphene and atomic sheets of transition-metal dichalcogenide; iron selenide and organic conductors on oxide and metal surfaces, respectively. Unique phenomena arising from the ultimate two-dimensionality of the system and the physics behind them are discussed.