Search results for " Langevin"

showing 2 items of 12 documents

Translocation dynamics of a short polymer driven by an oscillating force

2013

Under the terms of the Creative Commons Attribution 3.0 Unported License.

chemistry.chemical_classificationQuantitative Biology::BiomoleculesField (physics)Polymersmedia_common.quotation_subjectDynamics (mechanics)General Physics and AstronomyMonotonic functionPolymerFunction (mathematics)InertiaSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Settore FIS/03 - Fisica Della MateriaQuantitative Biology::Subcellular ProcessesCondensed Matter::Soft Condensed MatterLangevin equationchemistryChemical physicsMetastabilityPolymer translocation Complex Systems Langevin equation Stochastic modelingThermodynamicsStatistical physicsPhysical and Theoretical Chemistrymedia_common
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Detector's quantum backaction effects on a mesoscopic conductor and fluctuation-dissipation relation

2017

International audience; When measuring quantum mechanical properties of charge transport in mesoscopic conductors, backaction effects occur. We consider a measurement setup with an elementary quantum circuit, composed of an inductance and a capacitor, as detector of the current flowing in a nearby quantum point contact. A quantum Langevin equation for the detector variable including backaction effects is derived. Differences with the quantum Langevin equation obtained in linear response are pointed out. In this last case, a relation between fluctuations and dissipation is obtained, provided that an effective temperature of the quantum point contact is defined.

fluctuation-dissipation relationfluctuation-dissipation relation; mesoscopic conductor; Quantum backaction; quantum Langevin equation; Physics and Astronomy (all)Physics and Astronomy (all)quantum Langevin equationQuantum backaction mesoscopic conductor quantum Langevin equation fluctuation-dissipation relation.Quantum backactionmesoscopic conductorSettore FIS/03 - Fisica Della Materia[PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
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