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arXiv 1902.00879nlin.CD
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开放混沌系统中的疤痕:局域态密度

Scarring in open chaotic systems: The local density of states

Domenico Lippolis

摘要:

已知混沌哈密顿量在其谱和波函数统计的表观随机性方面遵循随机矩阵理论(RMT)系综。然而,由于系统特定的性质,或者作为经典混沌的量子特征,也会发生偏离RMT的情况。例如,疤痕是经典周期轨道附近波函数强度的增强,它可以通过局部态密度(或局部谱)来表征,该局部态密度(或局部谱)明显偏离RMT的预期,表现为半经典描述的峰值包络。在这里,该系统是连接到一个开放的,本地的状态密度被引入所产生的非厄米混沌哈密顿量,并估计先验的格林函数的封闭系统和开放的通道。所得到的预测进行测试耦合到一个单通道开放和菲涅尔型连续开放的量子映射。主要结果是,强耦合的开放逐渐抑制的能量依赖性的局域态密度由于疤痕,并恢复RMT行为。

英文摘要:

Chaotic Hamiltonians are known to follow Random Matrix Theory (RMT) ensembles in the apparent randomness of their spectra and wavefunction statistics. Deviations form RMT also do occur, however, due to system-specific properties, or as quantum signatures of classical chaos. Scarring, for instance, is the enhancement of wavefunction intensity near classical periodic orbits, and it can be characterized by a local density of states (or local spectrum) that clearly deviates from RMT expectations, by exhibiting a peaked envelope, which has been described semiclassically. Here, the system is connected to an opening, the local density of states is introduced for the resulting non-Hermitian chaotic Hamiltonian, and estimated a priori in terms of the Green's function of the closed system and the open channels. The predictions obtained are tested on quantum maps coupled both to a single-channel opening and to a Fresnel-type continuous opening. The main outcome is that strong coupling to the opening gradually suppresses the energy dependence of the local density of states due to scarring, and restores RMT behavior.

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