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arXiv 1504.01592cond-mat.mtrl-sciphysics.comp-ph
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第一性原理研究3d过渡金属掺杂的黑色和蓝色磷光体的稀磁半导体和半金属行为

Dilute magnetic semiconductor and half metal behaviors in 3d transition-metal doped black and blue phosphorenes: a first-principles study

Weiyang Yu, Zhili Zhu, Chun-Yao Niu, Chong Li, Jun-Hyung Cho, Yu Jia

摘要:

我们提出了第一性原理密度泛函计算的结构,电子和磁性的替代三维过渡金属(TM)杂质在二维黑色和蓝色的磷烯。我们发现,这种替代杂质的磁性可以理解的一个简单的模型的基础上的洪德规则。掺杂Ti、V、Cr、Mn、Fe、Ni等杂质的黑色磷光体表现出稀磁半导体(DMS)性质,而掺杂Sc、Co等杂质的黑色磷光体则表现出强磁半导体性质。另一方面,掺杂V、Cr、Mn和Fe的TM掺杂的蓝色磷光体显示出DMS性质,掺杂Ti和Ni的显示出半金属性质,而掺杂Sc和Co的系统显示出半金属性质。根据TM和磷原子杂化电子态的占据情况,我们确定了两种不同的区域:(i)对于Sc和Co掺杂的黑色和蓝色磷光体,成键态完全空或被填充,导致非磁性;(ii)对于Ti-、V-、Cr-、Mn-、Fe-和Ni-掺杂的黑色和蓝色磷光体,非键d态被部分占据,从而产生大的和局部的自旋力矩。这些结果为稀磁半导体和半金属在自旋电子器件中的潜在应用提供了一条新的途径。

英文摘要:

We present first-principles density-functional calculations for the structural, electronic, and magnetic properties of substitutional 3d transition metal (TM) impurities in two-dimensional black and blue phosphorenes. We find that the magnetic properties of such substitutional impurities can be understood in terms of a simple model based on the Hund's rule. The TM-doped black phosphorenes with Ti, V, Cr, Mn, Fe and Ni impurities show dilute magnetic semiconductor (DMS) properties while those with Sc and Co impurities show nonmagnetic properties. On the other hand, the TM-doped blue phosphorenes with V, Cr, Mn and Fe impurities show DMS properties, those with Ti and Ni impurities show half-metal properties, whereas Sc and Co doped systems show nonmagnetic properties. We identify two different regimes depending on the occupation of the hybridized electronic states of TM and phosphorous atoms: (i) bonding states are completely empty or filled for Sc- and Co-doped black and blue phosphorenes, leading to non-magnetic; (ii) non-bonding d states are partially occupied for Ti-, V-, Cr-, Mn-, Fe- and Ni-doped black and blue phosphorenes, giving rise to large and localized spin moments. These results provide a new route for the potential applications of dilute magnetic semiconductor and half-metal in spintronic devices by employing black and blue phosphorenes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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