Graphene-based Nanodevices in the Superconducting and Strongly Correlated Regimes
Abstract
The ability to isolate and manipulate high-quality few-atoms-thick materials represents a major advance in condensed matter physics. Assembling these ultra-thin materials into van der Waals heterostructures, i.e., artificial meta-materials with atomically sharp interfaces, markedly increases the rich variety of physical properties accessible in 2D systems. Graphene, a carbon-based 2D hexagonal lattice, possesses exceptional properties that since its discovery in 2004 have attracted wide attention from the scientific and engineering communities. In this work, I present a series of experiments via two different approaches, i.e., proximity effect and twist angle design, to induce superconductivity and strong correlations in graphene-based systems--two phenomena that do not intrinsically occur in this material. In the first part of this thesis, graphene is flanked by two superconductors and inherits their superconducting properties by proximity effect. Initially, the underlying microscopic mechanism of this phenomenon is investigated using planar tunneling spectroscopy. Then, a superconductor-graphene-superconductor junction is coupled to a superconducting circuit to create and manipulate the first graphene-based transmon qubit. In the second part of this dissertation, the electronic properties of graphene-based systems are engineered by controlling the relative twist angle between the atomic planes.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 13, 2022
- Accession Number
- AD1222605
Entities
People
- Daniel R. Legrain
Organizations
- Massachusetts Institute of Technology