arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0909.2984cond-mat.mes-hallcond-mat.str-el
收藏

高磁场下石墨烯中分数电荷的非限制化

Deconfined fractional electric charges in graphene at high magnetic fields

Chang-Yu Hou, Claudio Chamon, Christopher Mudry

摘要:

电荷中性(Dirac)点处的电阻由Rekelsky等人在Phys.Rev.B79,115434(2009)中示出,在施加垂直于石墨烯的强磁场时发散。我们认为,这种分歧是一个凯库勒不稳定性的石墨烯,这是由磁场诱导的签名。我们表明,强磁场不删除零模式,结合周围的电子涡旋的一小部分在凯库勒二聚模式,和淬火无序存在于系统中,使它能够大力分离的分数电荷。总之,这些发现表明石墨烯可以维持去精细化的电子。

英文摘要:

The resistance at the charge neutral (Dirac) point was shown by Checkelsky et al in Phys. Rev. B 79, 115434 (2009) to diverge upon the application of a strong magnetic field normal to graphene. We argue that this divergence is the signature for a Kekule instability of graphene, which is induced by the magnetic field. We show that the strong magnetic field does not remove the zero modes that bind a fraction of the electron around vortices in the Kekule dimerization pattern, and that quenched disorder present in the system makes it energetically possible to separate the fractional charges. These findings, altogether, indicate that graphene can sustain deconfined fractionalized electrons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑