Normal modes and time evolution of a holographic superconductor after a quantum quench

Normal modes and time evolution of a holographic superconductor after a quantum quench
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量子淬灭后全息超导体的正常模式和时间演化

DOI:
10.1007/jhep06(2014)019
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发表时间:
2012-12
影响因子:
5.4
通讯作者:
Xin Gao, Antonio M. García-García, Hua Bi Zeng, Hai-Qing Zhan
Xin Gao, Antonio M. García-García, Hua Bi Zeng, Hai-Qing Zhan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xin Gao, Antonio M. García-García, Hua Bi Zeng, Hai-Qing Zhan

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我们采用全息技术来研究强耦合超导体在扰动导致系统失去平衡后的有序参数的动力学。我们采用的重力对偶是零温度下的 AdS 5 孤子背景。我们首先分析与超导序参数相关的简正模,由于背景没有地平线,这些简正模是纯实数。然后我们研究失超后有序参数的全时间演变。对于足够弱且缓慢的扰动,我们表明阶次参数会及时经历简单的无阻尼振荡,其频率与先前计算的最低正常模型一致。这是预料之中的,因为孤子背景没有视界,因此,至少在考虑探测和大 N 限制时,系统将永远不会恢复平衡。对于更强和更突然的扰动,会激发更高的简正模,并且振荡模式变得越来越复杂。我们确定了一系列参数,其中顺序参数的时间演化变得准混沌。混沌演化的细节取决于所使用的扰动类型。因此,可以预期,有可能设计出一种扰动,导致振荡模式几乎完全破坏,从而导致由不同频率模式的叠加引起的准平衡。
We employ holographic techniques to investigate the dynamics of the order parameter of a strongly coupled superconductor after a perturbation that drives the system out of equilibrium. The gravity dual that we employ is the AdS 5 Soliton background at zero temperature. We first analyze the normal modes associated to the superconducting order parameter which are purely real since the background has no horizon. We then study the full time evolution of the order parameter after a quench. For sufficiently a weak and slow perturbation we show that the order parameter undergoes simple undamped oscillations in time with a frequency that agrees with the lowest normal model computed previously. This is expected as the soliton background has no horizon and therefore, at least in the probe and large N limits considered, the system will never return to equilibrium. For stronger and more abrupt perturbations higher normal modes are excited and the pattern of oscillations becomes increasingly intricate. We identify a range of parameters for which the time evolution of the order parameter become quasi chaotic. The details of the chaotic evolution depend on the type of perturbation used. Therefore it is plausible to expect that it is possible to engineer a perturbation that leads to the almost complete destruction of the oscillating pattern and consequently to quasi equilibration induced by superposition of modes with different frequencies.
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