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arXiv 1305.4145cond-mat.str-el
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拓扑绝缘体表面的电子驱动态

Driven Electronic States at the Surface of a Topological Insulator

Benjamin M. Fregoso, Y. H. Wang, N. Gedik, Victor Galitski

摘要:

受最近拓扑绝缘体表面光电子实验的启发,我们计算了在外部光源存在下驱动拓扑表面激发的光谱。我们完全表征这些非平衡电子激发的入射光的线偏振和圆偏振的光谱函数。我们发现,在后一种情况下,圆偏振光间隙的表面状态,而线偏振产生的各向异性金属与多个狄拉克锥。我们比较了最近的泵浦-探测光电发射测量的差距的大小,并找到了很好的协议。我们还确定了理论上的几个新功能的时间依赖的谱函数,如阴影狄拉克锥。

英文摘要:

Motivated by recent photoemission experiments on the surface of topological insulators we compute the spectrum of driven topological surface excitations in the presence of an external light source. We completely characterize the spectral function of these non-equilibrium electron excitations for both linear and circular polarizations of the incident light. We find that in the latter case, the circularly polarized light gaps out the surface states, whereas linear polarization gives rise to an anisotropic metal with multiple Dirac cones. We compare the sizes of the gaps with recent pump-probe photoemission measurements and find good agreement. We also identify theoretically several new features in the time-dependent spectral function, such as shadow Dirac cones.

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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