Search results for "Pi Josephson junction"

showing 3 items of 23 documents

Josephson effect in superfluid atomic Fermi-gases

2002

We consider an analog of the internal Josephson effect in superfluid atomic Fermi-gases. Four different hyperfine states of the atoms are assumed to be trapped and to form two superfluids via the BCS-type pairing. Weshow that Josephson oscillations can be realized by coupling the superfluids with two laser fields. Choosing the laser detunings in a suitable way leads to an asymmetric below-gap tunneling effect for which there exists no analogue in the context of solid-state superconductivity.

SuperconductivityJosephson effectPhysicsCondensed Matter::Quantum GasesCondensed matter physicsCondensed Matter::OtherCondensed Matter - SuperconductivityFOS: Physical sciencesContext (language use)Atomic and Molecular Physics and OpticsPi Josephson junctionSuperfluiditySuperconductivity (cond-mat.supr-con)PairingCondensed Matter::SuperconductivityPhysics::Atomic PhysicsHyperfine structureQuantum tunnelling
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From microscopic to macroscopic description of Josephson dynamics in one-dimensional arrays of weakly-coupled superconducting islands

2015

Abstract By starting from a microscopic quantum mechanical description of Josephson dynamics of a one-dimensional array of N coupled superconductors, we obtain a set of linear differential equations for the system order parameter and for additional macroscopic physical quantities. With opportune considerations, we adapt this description to two coupled superconductors, obtaining the celebrated Feynman model for Josephson junctions. These results confirm the correspondence between the microscopic picture and the semi-classical Ohta’s model adopted in describing the superconducting phase dynamics in multi-barrier Josephson junctions.

SuperconductivityJosephson effectPhysicsJosephson junctionsFeynman’s modelDynamics (mechanics)General Physics and AstronomyFeynman's modelPhysics and Astronomy(all)lcsh:QC1-999Feynman's model; Josephson junctions; One-dimensional arrays; Physics and Astronomy (all)Pi Josephson junctionOne-dimensional arrayssymbols.namesakePhysics and Astronomy (all)Classical mechanicsLinear differential equationCondensed Matter::SuperconductivitysymbolsFeynman diagramStatistical physicsQuantumlcsh:PhysicsPhysical quantity
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Josephson junctions and superconducting field effect transistors based on epitaxial Bi2Sr2Can-1CunO2(n+2) thin films

1998

Abstract Josephson junctions based on thin films of the Bi2Sr2Ca2Cu3O10+δ compound show IcRn products compatible with YBa2Cu3O7−δ samples. Using quasiparticle tunneling experiments we found evidence for a superconductor–insulator–superconductor tunneling process via localized states in the barrier. The Bi2Sr2CaCu2O8+δ compound is investigated regarding possible applications in superconducting field effect devices. We present thin films of four unit cells thickness that are superconducting at 58 K. An inverted metal–insulator–superconductor structure was prepared. From the modulation of the normal state resistance we estimate a carrier density of 7×1019 cm−3 for a superconducting sample. The…

SuperconductivityPi Josephson junctionJosephson effectMaterials scienceCondensed matter physicsCondensed Matter::SuperconductivityTransition temperatureGeneral EngineeringGeneral Physics and AstronomyField effectField-effect transistorThin filmQuantum tunnellingApplied Superconductivity
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