arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.01705cond-mat.mes-hallcond-mat.str-elquant-ph
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拓扑体态及其电流

Topological bulk states and their currents

Chris N. Self, Alvaro Rubio-García, Juan Jose García-Ripoll, Jiannis K. Pachos

摘要:

我们提供的证据表明,除了拓扑保护的边缘状态,二维陈省身绝缘体也支持本地化的体深在他们的价带和导带。当局部电势梯度被施加到主体时,这些状态显现,而系统的所有部分保持电连接到同一相。反过来,体状态产生横向于应变的体电流。即使当电势总是低于能隙时,也会发生这种情况,在这种情况下,人们预计只会出现边缘电流。体电流是拓扑保护的,并且在外部影响(例如温度或局部无序)下表现得像边缘电流。检测拓扑弹性体电流提供了一种直接的手段来探测局部体状态。

英文摘要:

We provide evidence that, alongside topologically protected edge states, two-dimensional Chern insulators also support localised bulk states deep in their valance and conduction bands. These states manifest when local potential gradients are applied to the bulk, while all parts of the system remain adiabatically connected to the same phase. In turn, the bulk states produce bulk current transverse to the strain. This occurs even when the potential is always below the energy gap, where one expects only edge currents to appear. Bulk currents are topologically protected and behave like edge currents under external influence, such as temperature or local disorder. Detecting topologically resilient bulk currents offers a direct means to probe the localised bulk states.

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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