Electronic and magneto-optical properties of monolayer phosphorene quantum dots

Electronic and magneto-optical properties of monolayer phosphorene quantum dots
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单层磷烯量子点的电子和磁光性质

DOI:
10.1088/2053-1583/2/4/045012
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发表时间:
2015-07
期刊:
影响因子:
5.5
通讯作者:
Chang Kai
Chang Kai
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhang Rui;Zhou X. Y.;Zhang D.;Lou Wen-Kai;Zhai F.;Chang Kai

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我们用紧束缚方法从理论上研究了矩形、六角形和三角形单层磷烯量子点的电学和磁光性质。对电子态、态密度、电子密度分布、Laudau能级以及光吸收光谱进行了数值计算。我们的计算表明:(1)由于各向异性的电子跃迁,在各种形状和边缘构型的MPQD中,边态都出现在带隙中。与石墨烯量子点不同,任何边缘态的电荷密度都只局限在MPQD的特定边缘;(2)随着磁场的增加,MPQD的磁能级呈现Hofstadter-蝴蝶谱,并接近MLP的朗道能级。在磁能谱中出现了一个与MLP完全不同的“平坦带”;(3)电学和光学性质可以通过点的大小、边界边缘的类型和外加磁场来调节。
We theoretically investigate the electronic and magneto-optical properties of rectangular, hexangular, and triangular monolayer phosphorene quantum dots (MPQDs) utilizing the tight-binding method. The electronic states, density of states, electronic density distribution, and Laudau levels as well as the optical absorption spectrum are calculated numerically. Our calculations show that: (1) edge states appear in the band gap in all kinds of MPQDs regardless of their shapes and edge configurations due to the anisotropic electron hopping in monolayer phosphorene (MLP). The charge density of any edge state is only localized in specific edges of a MPQD, which is distinct from that in graphene quantum dots; (2) the magnetic levels of MPQDs exhibit a Hofstadter-butterfly spectrum and approach the Landau levels of MLP as the magnetic field increases. A ‘flat band’ appears in the magneto-energy spectrum which is totally different from that of MLP; (3) the electronic and optical properties can be tuned by the dot size, the types of boundary edges and the external magnetic field.
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