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Magnetic ordering in quantum dots: Open versus closed shells

机译:量子点中的磁性排序:开壳与闭壳

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摘要

In magnetically doped quantum dots, changing the carrier occupancy from open to closed shells leads to qualitatively different forms of carrier-mediated magnetic ordering. While it is common to study such nanoscale magnets within a mean-field approximation, excluding the spin fluctuations can mask important phenomena and lead to spurious thermodynamic phase transitions in small magnetic systems. By employing coarse-grained, variational, and Monte Carlo methods on singly and doubly occupied quantum dots to include spin fluctuations, we evaluate the relevance of the mean-field description and distinguish different finite-size scaling in nanoscale magnets.
机译:在磁性掺杂的量子点中,将载流子占有率从开放壳转换为封闭壳会导致定性形式不同的载流子介导的磁有序化。虽然通常在平均场近似范围内研究此类纳米级磁体,但排除自旋波动会掩盖重要现象,并导致小型磁性系统中出现伪热力学相变。通过对单个和双重占据的量子点采用粗粒度,变分和蒙特卡罗方法以包含自旋涨落,我们评估了均值场描述的相关性并区分了纳米级磁体中的不同有限尺寸比例。

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  • 来源
    《Physical review》 |2015年第15期|155402.1-155402.12|共12页
  • 作者单位

    Department of Physics, St. Bonaventure University, St. Bonaventure, New York 14778, USA,Department of Physics, University at Buffalo, State University of New York, Buffalo, New York 14260, USA;

    Department of Physics, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA;

    Department of Physics, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA,Quantum Artificial Intelligence Laboratory, NASA Ames Research Center, Mail Stop 269-1, Moffett Field, California 94035, USA;

    Department of Physics, University at Buffalo, State University of New York, Buffalo, New York 14260, USA;

    Department of Physics, University at Buffalo, State University of New York, Buffalo, New York 14260, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic semiconductors; quantum dots; magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields;

    机译:磁性半导体量子点;磁电子学自旋电子学:利用自旋极化传输或集成磁场的设备;

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