Quantum dynamics and response in nanoscale spin systems

Seiji Miyashita, Masamichi Nishino, Keiji Saitou

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)327-334
Number of pages8
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume376
DOIs
Publication statusPublished - 2002
Externally publishedYes

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Magnetization
Resonant tunneling
magnetization
magnetic effects
resonant tunneling
Magnets
Energy gap
magnets
heat
causes
decay
Hot Temperature

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Quantum dynamics and response in nanoscale spin systems. / Miyashita, Seiji; Nishino, Masamichi; Saitou, Keiji.

In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Vol. 376, 2002, p. 327-334.

Research output: Contribution to journalArticle

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