0000000001116128

AUTHOR

Sheelan Sengupta Chowdhury

showing 2 related works from this author

Large diamagnetic persistent currents

2007

In multichannel rings, evanescent modes will always co-exist with propagating modes. The evanescent modes can carry a very large diamagnetic persistent current that can oscillate with energy and are very sensitive to impurity scattering. This provides a natural explanation for the large diamagnetic persistent currents observed in experiments.

PhysicsCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsScatteringGeneral Physics and AstronomyFOS: Physical sciencesPersistent currentCondensed Matter::Mesoscopic Systems and Quantum Hall EffectImpurityCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)DiamagnetismPhysics::Atomic PhysicsComputer Science::Databases
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S-matrix formulation of mesoscopic systems and evanescent modes.

2009

The Landauer-Butikker formalism is an important formalism to study mesoscopic systems. Its validity for linear transport is well established theoretically as well as experimentally. Akkermans et al [Phys. Rev. Lett. {\bf 66}, 76 (1991)] had shown that the formalism can be extended to study thermodynamic properties like persistent currents. It was earlier verified for simple one dimensional systems. We study this formula very carefully and conclude that it requires reinterpretation in quasi one dimension. This is essentially because of the presence of evanescent modes in quasi one dimension.

PhysicsMesoscopic physicsFormalism (philosophy of mathematics)Evanescent waveCondensed Matter - Mesoscale and Nanoscale PhysicsQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)FOS: Physical sciencesGeneral Materials ScienceCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCalculation methodsS-matrixJournal of physics. Condensed matter : an Institute of Physics journal
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