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arXiv 1306.1666cond-mat.mes-hallcond-mat.str-el
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MoS $_2$单层中的等离子体激元和筛选

Plasmons and screening in a monolayer of MoS$_2$

Andreas Scholz, Tobias Stauber, John Schliemann

摘要:

本文在无规相近似下研究了二硫化钼单层膜的动态介电函数。而在石墨烯中,等离子体激元的阻尼是由带间跃迁引起的,由于单层MoS $_2$中的大的直接带隙,集体电荷激发进入带内电子空穴连续体,类似于二维电子和空穴气体中的情况。由于在MoS $_2$中不存在电子-空穴对称性,因此p型和n型掺杂样品中的等离子体激元能量明显不同。由大的内在自旋轨道相互作用引起的自旋简并的打破导致足够大的载流子浓度,空穴以及电子的弗里德尔振荡的跳动。

英文摘要:

We investigate the dynamical dielectric function of a monolayer of molybdenum disulfide within the random phase approximation. While in graphene damping of plasmons is caused by interband transitions, due to the large direct band gap in monolayer MoS$_2$ collective charge excitations enter the intraband electron hole continuum similar to the situation in two-dimensional electron and hole gases. Since there is no electron-hole symmetry in MoS$_2$, the plasmon energies in p- and n-doped samples clearly differ. The breaking of spin degeneracy caused by the large intrinsic spin-orbit interaction leads to a beating of Friedel oscillations for sufficiently large carrier concentrations, for holes as well as for electrons.

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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