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Dynamics of a central electron spin coupled to an anti-ferromagnetic spin bath driven by a variable magnetic field in the Landau-Zener scenario

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Abstract.

The Landau-Zener (LZ) transition probability of a two-level crossing in a single quantum dot driven by a two-state auto-correlated (TSAC) noise is studied. The model used isolates a central electron spin (CES) system bathed with TSAC noise and an anti-ferromagnetic spin bath. This model turnes into the LZ formalism in the limit of weak-excitation magnetic field. The effects of noise and of the coupling with the spin chain, on the LZ-transition probability are studied. In the weak coupling regime of the CES with the bath, it is seen that the TSAC noise effect can be compared with that of a deterministic sinusoidal oscillating function. In the strong coupling regime this effect decreases and alters the noise process on the LZ-transition probability.

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Authors and Affiliations

  1. Mesoscopic and Multilayer Structures Laboratory, Department of Physics, Faculty of Science, University of Dschang, Dschang, Cameroon

    Georges Collince Fouokeng, Martin Tchoffo, Mathurin Esouague Ateuafack & Lukong Cornelius Fai

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  1. Georges Collince Fouokeng
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  2. Martin Tchoffo
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  3. Mathurin Esouague Ateuafack
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  4. Lukong Cornelius Fai
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Correspondence to Georges Collince Fouokeng.

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Fouokeng, G., Tchoffo, M., Ateuafack, M. et al. Dynamics of a central electron spin coupled to an anti-ferromagnetic spin bath driven by a variable magnetic field in the Landau-Zener scenario. Eur. Phys. J. Plus 129, 151 (2014). https://doi.org/10.1140/epjp/i2014-14151-x

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  • DOI: https://doi.org/10.1140/epjp/i2014-14151-x

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