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arXiv 1601.00693cond-mat.mes-hallgr-qc
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出现引力时石墨烯中的朗道能级

Landau Levels in graphene in the presence of emergent gravity

Z. V. Khaidukov, M. A. Zubkov

摘要:

我们考虑石墨烯在外部磁场和弹性形变的存在下,导致新兴的磁场。总磁场导致准粒子谱中出现朗道能级。此外,石墨烯中的准粒子经历了突现引力。我们考虑了弹性形变的特定选择,它给出恒定的出射磁场和消失的扭转。突现引力可以看作是微扰。我们证明了相应的一级近似只通过费米速度的常数重整化来影响朗道能级的能量。每个朗道能级的简并度都得到了修正,这主要取决于样品的几何形状。存在所考虑的弹性形变的极限情况,其对应于均匀拉伸的石墨烯。在这种情况下,在外部磁场的存在下,朗道能级的简并保持不变。

英文摘要:

We consider graphene in the presence of external magnetic field and elastic deformations that cause emergent magnetic field. The total magnetic field results in the appearance of Landau levels in the spectrum of quasiparticles. In addition, the quasiparticles in graphene experience the emergent gravity. We consider the particular choice of elastic deformation, which gives constant emergent magnetic field and vanishing torsion. Emergent gravity may be considered as perturbation. We demonstrate that the corresponding first order approximation affects the energies of the Landau levels only through the constant renormalization of Fermi velocity. The degeneracy of each Landau level receives correction, which depends essentially on the geometry of the sample. There is the limiting case of the considered elastic deformation, that corresponds to the uniformly stretched graphene. In this case in the presence of the external magnetic field the degeneracies of the Landau levels remain unchanged.

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