Quantum dynamics and response in nanoscale spin systems

Seiji Miyashita; Masamichi Nishino; Keiji Saito

doi:10.1080/10587250210725

Quantum dynamics and response in nanoscale spin systems

Seiji Miyashita, Masamichi Nishino, Keiji Saito

Research output: Contribution to journal › Conference article › peer-review

Abstract

We study the quantum dynamics with the effect of dissipative environments in nanoscale magnetic systems, e.g. the molecular magnets such as Mn ₁₂, Feg and V₁₅ and also the locally induced magnetizations in the so-called gaped spin systems. We analyze the dynamics from a view point of nonadiabatic transition at the avoided level crossing points which is called the resonant tunneling point. By the quantum master equation, we study effects of the heat contact on an adiabatic process (magnetic Föhn effect) which is relevant for systems with a large gap such as V₁₅. By the quantum Langevin equation we study how successive random crossings cause a nonexponential decay of the magnetization in the systems with very small energy gap such as Mn₁₂ and Feg.

Original language	English
Pages (from-to)	327-334
Number of pages	8
Journal	Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume	376
DOIs	https://doi.org/10.1080/10587250210725
Publication status	Published - 2002
Externally published	Yes
Event	Proceedings of the Interdisciplinary Symposium on Multifunctionality of Inorganic , Organic, and Their Hybrid Solids - Honolulu, HI, United States Duration: 2000 Dec 15 → 2000 Dec 18

Keywords

Nanosrale magnets
Nonadiabatic transition quantum master equation
Quantum Langeviu equation
Quantum dynamics

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/10587250210725

Cite this

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title = "Quantum dynamics and response in nanoscale spin systems",

abstract = "We study the quantum dynamics with the effect of dissipative environments in nanoscale magnetic systems, e.g. the molecular magnets such as Mn 12, Feg and V15 and also the locally induced magnetizations in the so-called gaped spin systems. We analyze the dynamics from a view point of nonadiabatic transition at the avoided level crossing points which is called the resonant tunneling point. By the quantum master equation, we study effects of the heat contact on an adiabatic process (magnetic F{\"o}hn effect) which is relevant for systems with a large gap such as V15. By the quantum Langevin equation we study how successive random crossings cause a nonexponential decay of the magnetization in the systems with very small energy gap such as Mn12 and Feg.",

keywords = "Nanosrale magnets, Nonadiabatic transition quantum master equation, Quantum Langeviu equation, Quantum dynamics",

author = "Seiji Miyashita and Masamichi Nishino and Keiji Saito",

year = "2002",

doi = "10.1080/10587250210725",

language = "English",

volume = "376",

pages = "327--334",

journal = "Molecular Crystals and Liquid Crystals",

issn = "1542-1406",

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note = "Proceedings of the Interdisciplinary Symposium on Multifunctionality of Inorganic , Organic, and Their Hybrid Solids ; Conference date: 15-12-2000 Through 18-12-2000",

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T1 - Quantum dynamics and response in nanoscale spin systems

AU - Miyashita, Seiji

AU - Nishino, Masamichi

AU - Saito, Keiji

PY - 2002

Y1 - 2002

N2 - We study the quantum dynamics with the effect of dissipative environments in nanoscale magnetic systems, e.g. the molecular magnets such as Mn 12, Feg and V15 and also the locally induced magnetizations in the so-called gaped spin systems. We analyze the dynamics from a view point of nonadiabatic transition at the avoided level crossing points which is called the resonant tunneling point. By the quantum master equation, we study effects of the heat contact on an adiabatic process (magnetic Föhn effect) which is relevant for systems with a large gap such as V15. By the quantum Langevin equation we study how successive random crossings cause a nonexponential decay of the magnetization in the systems with very small energy gap such as Mn12 and Feg.

AB - We study the quantum dynamics with the effect of dissipative environments in nanoscale magnetic systems, e.g. the molecular magnets such as Mn 12, Feg and V15 and also the locally induced magnetizations in the so-called gaped spin systems. We analyze the dynamics from a view point of nonadiabatic transition at the avoided level crossing points which is called the resonant tunneling point. By the quantum master equation, we study effects of the heat contact on an adiabatic process (magnetic Föhn effect) which is relevant for systems with a large gap such as V15. By the quantum Langevin equation we study how successive random crossings cause a nonexponential decay of the magnetization in the systems with very small energy gap such as Mn12 and Feg.

KW - Nanosrale magnets

KW - Nonadiabatic transition quantum master equation

KW - Quantum Langeviu equation

KW - Quantum dynamics

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DO - 10.1080/10587250210725

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JF - Molecular Crystals and Liquid Crystals

T2 - Proceedings of the Interdisciplinary Symposium on Multifunctionality of Inorganic , Organic, and Their Hybrid Solids

Y2 - 15 December 2000 through 18 December 2000

ER -

Quantum dynamics and response in nanoscale spin systems

Abstract

Keywords

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