Quantum coherence controls the nature of equilibration and thermalization in coupled chaotic systems

Pulikkottil, Jethin J.; Lakshminarayan, Arul; Srivastava, Shashi C. L.; I., Kieler, Maximilian F.; Bäcker, Arnd; Tomsovic, Steven

doi:10.1103/physreve.107.024124

Cited by 8 publications

(1 citation statement)

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“…In this context, RMT has rather successfully been applied to various universal aspects of particular information measures [202,244]. It has been of further utility for studying weakly connected bipartite chaotic systems as well [245][246][247][248]. In contrast, the use of MB semiclassical methods face severe technical difficulties and only limited work has been accomplished.…”

Section: Perspectivesmentioning

confidence: 99%

Semiclassical roots of universality in many-body quantum chaos

Richter

Urbina

Tomsovic

2022

J. Phys. A: Math. Theor.

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Quantum chaos of many-body systems has been swiftly developing into a vibrant research area at the interface between various disciplines, ranging from statistical physics to condensed matter to quantum information and to cosmology. In quantum systems with a classical limit, advanced semiclassical methods provide the crucial link between classically chaotic dynamics and corresponding universal features at the quantum level. Recently, single-particle techniques dealing with ergodic wave interference in the usual semiclassical limit ħ → 0 have begun to be transformed into the field theoretical domain of N -particle systems in the analogous semiclassical limit ħ_eff = 1/N → 0, thereby accounting for genuine many-body quantum interference. This semiclassical many-body theory provides a unified framework for understanding random-matrix correlations of both single-particle and many-body quantum chaotic systems. Certain braided bundles of classical orbits, and of mean field modes, govern interference, respectively, and provide the key to the foundation of universality. Case studies presented include a many-body version of Gutzwiller’s trace formula for the spectral density and out-of-time-order correlators along with brief remarks on where further progress may be forthcoming.

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