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arXiv 2102.09969hep-thcond-mat.str-el
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可极化全息介质在磁场中的集体模

Collective modes of polarizable holographic media in magnetic fields

Matteo Baggioli, Ulf Gran, Marcus Tornsö

摘要:

研究了在有限外部磁场中具有动态电磁相互作用的中性全息等离子体。通过混合边界条件引入了麦克斯韦规范场的库仑相互作用。详细分析了有限波矢下的集体模,并与仅在小磁场下有效的磁流体力学结果进行了比较。令人惊讶的是,在大磁场下,我们观察到两个类等离子体振子模式的出现,其相应的有效等离子体频率随着磁场的增加而增加,并且不受任何背景电荷密度的支持。最后,我们确定了一个模式的碰撞,这使我们能够研究的线性流体动力学扩展的收敛半径作为外部磁场的函数。我们发现,在动量空间的收敛半径,有关的扩散横向电磁模式,增加的磁场的强度平方。

英文摘要:

We consider a neutral holographic plasma with dynamical electromagnetic interactions in a finite external magnetic field. The Coulomb interactions are introduced via mixed boundary conditions for the Maxwell gauge field. The collective modes at finite wave-vector are analyzed in detail and compared to the magneto-hydrodynamics results valid only at small magnetic fields. Surprisingly, at large magnetic field, we observe the appearance of two plasmon-like modes whose corresponding effective plasma frequency grows with the magnetic field and is not supported by any background charge density. Finally, we identify a mode collision which allows us to study the radius of convergence of the linearized hydrodynamics expansion as a function of the external magnetic field. We find that the radius of convergence in momentum space, related to the diffusive transverse electromagnetic mode, increases quadratically with the strength of the magnetic field.

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。

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