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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8069
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dc.contributor.authorBhattacharjee, Suraka-
dc.contributor.authorMandal, Koushik-
dc.contributor.authorSinha, Supurna-
dc.date.accessioned2023-03-24T06:01:45Z-
dc.date.available2023-03-24T06:01:45Z-
dc.date.issued2023-02-28-
dc.identifier.citationInternational Journal of Modern Physics B, 2023, Vol. 2024, p2450005en_US
dc.identifier.issn0217-9792-
dc.identifier.issn1793-6578 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/8069-
dc.descriptionRestricted Access.en_US
dc.description.abstractWe derive a quantum Langevin equation for a quantum spin in the presence of a magnetic field and coupled to a bath. We have considered two models for the bath: an Ohmic bath model and a non-Markovian Drude bath model with finite memory. The effect of finite memory on the dynamics of the quantum spin is studied in detail. In particular, we have studied the effect of memory on the expectation values of the magnetic moment and the spin correlation functions. The time evolution study of the spin correlation functions shows that the correlation functions exhibit a damped oscillatory behavior with the randomization time being determined by the damping rate. We have analytically shown that the damping gets affected by the finite memory time when the bath retains memory of the interaction with the system. We also analyze the spin response function of the system for the Ohmic bath. Our results qualitatively agree with the findings in spin noise spectroscopy experiments and our predictions can be tested in future ultracold atom experiments.en_US
dc.language.isoenen_US
dc.publisherWorld Scientificen_US
dc.relation.urihttps://doi.org/10.1142/S021797922450005Xen_US
dc.rights2023 World Scientificen_US
dc.subjectSpin Langevin equationen_US
dc.subjectfluctuation dissipationspinen_US
dc.subjectSpin dynamicsen_US
dc.subjectOhmic bathen_US
dc.subjectDrude bathen_US
dc.titleInterplay of dissipation and memory in the quantum Langevin dynamics of a spin in a magnetic fielden_US
dc.typeArticleen_US
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