Spin symmetry of the bilayer graphene ground state
Spin symmetry of the bilayer graphene ground state
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DOI：
10.1103/physrevb.87.161402
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发表时间：
2013-04-12
影响因子：
3.7
通讯作者：
Schoenenberger, Christian
中科院分区：
文献类型：
--
作者：
Freitag, Frank;Weiss, Markus;Schoenenberger, Christian
我们展示了在干净的悬浮双层石墨烯上的非线性输运实验，揭示了态密度的差距。观察不同取向磁场中间隙的演化，发现基态为自旋有序相。在理论预测的三种可能的间隙基态中，层间电荷分布相等，因此我们可以排除量子反常霍尔相，使层反铁磁体和量子自旋霍尔相成为双层石墨烯唯一可能的间隙基态。DOI: 10.1103 / PhysRevB.87.161402
We show nonlinear transport experiments on clean, suspended bilayer graphene that reveal a gap in the density of states. Looking at the evolution of the gap in magnetic fields of different orientation, we find that the ground state is a spin-ordered phase. Of the three possible gapped ground states that are predicted by theory for equal charge distribution between the layers, we can therefore exclude the quantum anomalous Hall phase, leaving the layer antiferromagnet and the quantum spin Hall phase as the only possible gapped ground states for bilayer graphene. DOI: 10.1103/PhysRevB.87.161402