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Helical Edge States and Quantum Phase Transitions in Tetralayer Graphene.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-13 , DOI: 10.1103/physrevlett.125.036803
Shi Che 1 , Yanmeng Shi 2 , Jiawei Yang 1 , Haidong Tian 1 , Ruoyu Chen 1 , Takashi Taniguchi 3 , Kenji Watanabe 3 , Dmitry Smirnov 4 , Chun Ning Lau 1 , Efrat Shimshoni 5 , Ganpathy Murthy 6 , Herbert A Fertig 7
Affiliation  

Helical conductors with spin-momentum locking are promising platforms for Majorana fermions. Here we report observation of two topologically distinct phases supporting helical edge states in charge neutral Bernal-stacked tetralayer graphene in Hall bar and Corbino geometries. As the magnetic field B and out-of-plane displacement field D are varied, we observe a phase diagram consisting of an insulating phase and two metallic phases, with 0, 1, and 2 helical edge states, respectively. These phases are accounted for by a theoretical model that relates their conductance to spin-polarization plateaus. Transitions between them arise from a competition among interlayer hopping, electrostatic and exchange interaction energies. Our work highlights the complex competing symmetries and the rich quantum phases in few-layer graphene.

中文翻译:

四层石墨烯中的螺旋边缘状态和量子相变。

具有自旋动量锁定功能的螺旋导体是马里亚纳费米子的有前途的平台。在这里,我们报告了在霍尔棒和Corbino几何结构中电荷中性Bernal堆叠的四层石墨烯中支持螺旋边缘状态的两个拓扑不同的相的观察。作为磁场 和平面外位移场 d改变时,我们观察到由绝缘相和两个金属相组成的相图,分别具有0、1和2个螺旋边缘态。这些相由理论模型解释,该理论模型将其电导与自旋极化高原联系起来。它们之间的过渡是由层间跳跃能量,静电能量和交换相互作用能量之间的竞争引起的。我们的工作着重强调了多层石墨烯中复杂的竞争对称性和丰富的量子相。
更新日期:2020-07-13
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