5 papers
Disorder-Induced Enhancement of Fermionic Superradiance
David Pascual Solis, Andrea Legramandi, Soumik Bandyopadhyay +1
Collective light-matter phenomena such as Dicke superradiance are often described as a collection of effective spins coupled homogeneously to a bosonic mode, giving rise to a colle…
Many-body spectral transitions through the lens of the variable-range SYK2 model
Andrea Legramandi, Soumik Bandyopadhyay, Philipp Hauke
The Sachdev-Ye-Kitaev (SYK) model is a cornerstone in the study of quantum chaos and holographic quantum matter. Real-world implementations, however, deviate from the idealized all…
From single-particle to many-body chaos in Yukawa--SYK: theory and a cavity-QED proposal
David Pascual Solis, Alex Windey, Soumik Bandyopadhyay +2
Understanding how quantum systems transition from integrable to fully chaotic behavior remains a central open problem in physics. The Sachdev--Ye--Kitaev (SYK) model provides a par…
Complexity transitions in chaotic quantum systems: Nonstabilizerness, entanglement, and fractal dimension in SYK and random matrix models
Gopal Chandra Santra, Alex Windey, Soumik Bandyopadhyay +2
Complex quantum systems -- composed of many, interacting particles -- are intrinsically difficult to model. When a quantum many-body system is subject to disorder, it can undergo t…
The moments of the spectral form factor in SYK
Andrea Legramandi, Neil Talwar
In chaotic quantum systems the spectral form factor exhibits a universal linear ramp and plateau structure with superimposed erratic oscillations. The mean signal and the statistic…