Josephson effect in ballistic graphene sheet

May 18, 2017 · Using graphene to create quantum bits Date: May 18, 2017 Source: Ecole Polytechnique Fédérale de Lausanne Summary: In the race to produce a quantum computer, a number of projects are seeking a ...

In a recent report published on Science Advances, Andrew Seredinski and co-workers presented a graphene-based Josephson junction with dedicated side gates fabricated from the same sheet of ... of these sheets is loosely bound and can easily be cleaved. A single, isolated sheet of SP-2 bonded carbon is known as Graphene(8). As such, graphene is the basic form for most carbon based structures: multiple sheets of graphene form graphite, a sheet of graphene rolled into a cylinder forms a

In this study, we demonstrate short Josephson coupling in micrometer-long ballistic graphene Josephson junction by attaching Ta superconducting contacts on the BN sandwiched graphene. The superconducting critical current ( I C ) and normal resistance ( R N ) are measured over a range of applied gate voltage. As far as we know, this is the first time that ballistic transport has been observed in a Josephson junction based on CVD graphene. In addition, the critical current can be effectively modulated by the gate voltage, allowing more flexibility for device operation, such as gate-voltage-based control of flux or phase qubits incorporating Josephson ... of these sheets is loosely bound and can easily be cleaved. A single, isolated sheet of SP-2 bonded carbon is known as Graphene(8). As such, graphene is the basic form for most carbon based structures: multiple sheets of graphene form graphite, a sheet of graphene rolled into a cylinder forms a Graphene’s extended, atomic configuration also enables scientists to measure graphene’s electronic Andreev states as the material comes in contact with superconductors. Scientists can also control the density of electrons in graphene and investigate how it affects the superconducting proximity effect.

The self-consistent temperature dependence of CPR in ballistic graphene Josephson junctions have been studied by Black-Schaffer and Linder . Moreover, the effect of the strain on the supercurrent in a ballistic graphene Josephson junction have been studied by Alidoust and Linder . They have shown the supercurrent at the charge neutrality point can be tuned efficiently by means of mechanical strain. In a recent report published on Science Advances, Andrew Seredinski and co-workers presented a graphene-based Josephson junction with dedicated side gates fabricated from the same sheet of ... The self-consistent temperature dependence of CPR in ballistic graphene Josephson junctions have been studied by Black-Schaffer and Linder . Moreover, the effect of the strain on the supercurrent in a ballistic graphene Josephson junction have been studied by Alidoust and Linder . They have shown the supercurrent at the charge neutrality point can be tuned efficiently by means of mechanical strain. Sep 20, 2014 · The Josephson effect describes a phenomenon of supercurrent through a device known as a Josephson junction . It is a two-particle process in which a Cooper pair in one superconductor can across a weak link into the other superconductor without any voltage applied. Recently, Josephson effect on the surface of strong TI has attracted a lot of ...