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arXiv 1302.2841cond-mat.mes-hallhep-th
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从非平衡稳态设计材料:驱动石墨烯作为具有拓扑特性的可调半导体

Materials design from non-equilibrium steady states: driven graphene as a tunable semiconductor with topological properties

Thomas Iadecola, David Campbell, Claudio Chamon, Chang-Yu Hou, Roman Jackiw, So-Young Pi, Silvia Viola Kusminskiy

摘要:

通过使材料脱离平衡来控制材料的性质是一个令人兴奋的前景,直到最近才开始探索。在本文中,我们给出了这样的材料设计的一个引人注目的理论例子:在单层石墨烯中的可调间隙是通过激发一个特定的光学声子产生的。我们表明,该系统达到一个稳定的状态,其输运性质是相同的,如果系统有一个静态的电子间隙,可控的驱动幅度。此外,稳定状态显示拓扑现象:有手性边缘电流,它循环的分数电荷e/2每个旋转周期,频率设置的光学声子频率。

英文摘要:

Controlling the properties of materials by driving them out of equilibrium is an exciting prospect that has only recently begun to be explored. In this paper we give a striking theoretical example of such materials design: a tunable gap in monolayer graphene is generated by exciting a particular optical phonon. We show that the system reaches a steady state whose transport properties are the same as if the system had a static electronic gap, controllable by the driving amplitude. Moreover, the steady state displays topological phenomena: there are chiral edge currents, which circulate a fractional charge e/2 per rotation cycle, with frequency set by the optical phonon frequency.

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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