Noise effect on the nonadiabatic transition and correction to the tunneling energy gap estimated by the Landau-Zener-Stückelberg formula

Masamichi Nishino, Keiji Saito, Seiji Miyashita

研究成果: Article

21 引用 (Scopus)

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We study the effect of noise on the tunneling process of the magnetization in a sweeping field from the viewpoint of the nonadiabatic transition. The tunneling probability depends on the properties of the noise, e.g. the direction, the amplitude, and the relaxation time of the autocorrelation function. We investigate the tunneling probability in the presence of noise by solving the time-dependent Schrödinger equation numerically. We estimate the effective tunneling gap making use of the Landau-Zener-Stückelberg (LZS) formula. The dependence of the gap on the sweeping velocity reproduces the corresponding experimental data qualitatively. The estimated gap has no velocity dependence for a fast sweeping field and this gap seems to give the true gap. However, we show that a correction for the estimated energy gap is necessary and we propose a correction formula.

元の言語English
記事番号014403
ページ(範囲)144031-144037
ページ数7
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
65
発行部数1
出版物ステータスPublished - 2002 1 1
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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