Valley-Selective Topological Ordered States in Irradiated Bilayer Graphene
arXiv:1608.07097 · doi:10.1088/2053-1583/aa9471
Abstract
Gapless bilayer graphene is susceptible to a variety of spontaneously gapped states. As predicted by theory and observed by experiment, the ground state is however topologically trivial, because a valley-independent gap is energetically favorable. Here, we show that under the application of interlayer electric field and circularly polarized light, one valley can be selected to exhibit the original interaction instability while the other is frozen out. Tuning this Floquet system stabilizes multiple competing topological ordered states, distinguishable by edge transport and circular dichroism. Notably, quantized charge, spin, and valley Hall conductivities coexist in one stabilized state.
published version, 7 pages, 3 figures
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Cited by in corpus (8)
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- One-way transport in laser-illuminated bilayer graphene: A Floquet isolator
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- Crossover of spin Hall to quantum anomalous Hall effect in PbC/MnSe heterostructures