arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1912.07321hep-thcond-mat.str-el
收藏

相互作用全息等离子体中的横向集体模

Transverse Collective Modes in Interacting Holographic Plasmas

Matteo Baggioli, Ulf Gran, Marcus Tornsö

摘要:

本文详细研究了存在电磁库仑相互作用的简单全息模型的横向集体模。我们通过混合边界条件,对应于边界场论中的双迹形变,使麦克斯韦规范场动力学化。我们考虑三种不同的情况:(i)一个全息等离子体与守恒动量,(ii)一个全息(脏)等离子体与有限的动量弛豫和(iii)一个全息粘弹性等离子体与传播的横向声子。我们观察到两个有趣的新功能引起的库仑相互作用:在有限的动量弛豫的剪切模式和光子模式之间的模式排斥,和传播扩散交叉的横向集体模式引起的有限的电磁相互作用。最后,在大电荷密度下,我们的结果与准粒子间强相互作用下带电费米液体的横向集体模谱一致,但有一个重要的区别:带隙光子模甚至在零动量时也被阻尼.这种性质,通常被称为反常衰减,是由与量子临界连续态的相互作用产生的,并且可能在接近量子临界的强相关材料中实验观察到,例如奇怪的金属。

英文摘要:

We study in detail the transverse collective modes of simple holographic models in presence of electromagnetic Coulomb interactions. We render the Maxwell gauge field dynamical via mixed boundary conditions, corresponding to a double trace deformation in the boundary field theory. We consider three different situations: (i) a holographic plasma with conserved momentum, (ii) a holographic (dirty) plasma with finite momentum relaxation and (iii) a holographic viscoelastic plasma with propagating transverse phonons. We observe two interesting new features induced by the Coulomb interactions: a mode repulsion between the shear mode and the photon mode at finite momentum relaxation, and a propagation-to-diffusion crossover of the transverse collective modes induced by the finite electromagnetic interactions. Finally, at large charge density, our results are in agreement with the transverse collective mode spectrum of a charged Fermi liquid for strong interaction between quasi-particles, but with an important difference: the gapped photon mode is damped even at zero momentum. This property, usually referred to as anomalous attenuation, is produced by the interaction with a quantum critical continuum of states and might be experimentally observable in strongly correlated materials close to quantum criticality, e.g. in strange metals.

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。

↑