Topological charge pumping by a sliding moire pattern
Topological charge pumping by a sliding moire pattern
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DOI：
10.1103/physrevb.101.041112
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发表时间：
2020-01-28
影响因子：
3.7
通讯作者：
Koshino, Mikito
中科院分区：
文献类型：
--
作者：
Fujimoto, Manato;Koschke, Henri;Koshino, Mikito
研究了莫尔超晶格中层间滑移驱动的绝热拓扑电荷泵。我们表明，当我们滑动的扭曲双层系统的一个单一的层相对于其他，莫尔图案流和量子化的电子传输发生。泵浦电荷数被量化为滑动陈数，它与层间滑动自由度有关。在扭曲的双层石墨烯中，当费米能级处于近平带上方或下方的能隙中时，拓扑泵浦电流垂直于滑动方向流动。
We study the adiabatic topological charge pumping driven by interlayer sliding in the moire superlattices. We show that, when we slide a single layer of the twisted bilayer system relatively to the other, a moire pattern flow and a quantized transport of electrons occur. The number of pumped charges is quantized to a sliding Chern number, which is related to the interlayer sliding degree of freedom. In the twisted bilayer graphene, the topological pumping current flows perpendicularly to the sliding direction when the Fermi energy is in the energy gap above or below the nearly-flat bands.