Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Joule spectroscopy of hybrid superconductor-semiconductor nanodevices.

Nature communications·2023
Same author

Quantum-well states at the surface of a heavy-fermion superconductor.

Nature·2023
Same author

Signatures of Interactions in the Andreev Spectrum of Nanowire Josephson Junctions.

Physical review letters·2022
Same author

Coherent manipulation of an Andreev spin qubit.

Science (New York, N.Y.)·2021
Same author

A Green's function approach to topological insulator junctions with magnetic and superconducting regions.

Journal of physics. Condensed matter : an Institute of Physics journal·2020
Same author

From Adiabatic to Dispersive Readout of Quantum Circuits.

Physical review letters·2020

Related Experiment Video

Updated: Jun 3, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

A Green function approach to graphene-superconductor junctions with well-defined edges.

William J Herrera1, P Burset, A Levy Yeyati

  • 1Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 15, 2011
PubMed
Summary

This study introduces a new method to analyze spectral properties of graphene with defined edges. It reveals signatures of specular Andreev reflections in graphene-superconductor junctions.

More Related Videos

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
11:24

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

Related Experiment Videos

Last Updated: Jun 3, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
11:24

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

Published on: July 11, 2025

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Graphene's unique electronic properties, particularly at edges, are crucial for advanced electronic applications.
  • Understanding superconductivity in graphene junctions requires detailed analysis of boundary effects and electron interactions.

Purpose of the Study:

  • To develop a novel theoretical framework for describing spectral properties of graphene layers with well-defined edges.
  • To investigate the behavior of normal and superconducting graphene layers at a junction using microscopic analysis.
  • To identify signatures of specific quantum phenomena, such as Andreev reflections, in these systems.

Main Methods:

  • Microscopic analysis of the boundary problem for continuous Bogoliubov-de Gennes-Dirac equations.
  • Derivation of Green functions for normal and superconducting graphene.
  • Setting up and solving an algebraic Dyson equation for a graphene-superconductor junction.
  • Analytical derivation of Green functions for the coupled system.

Main Results:

  • Green functions for normal and superconducting graphene layers were derived.
  • An algebraic Dyson equation was formulated and solved for a graphene-superconductor junction.
  • Local density of states and induced pairing correlations were calculated.
  • Signatures of specular Andreev reflections were identified in the normal region.

Conclusions:

  • The novel approach successfully describes spectral properties of graphene layers with defined edges.
  • The study provides a theoretical basis for understanding electron behavior in graphene-superconductor junctions.
  • Identified Andreev reflection signatures offer insights into quantum phenomena at material interfaces.