9 papers
On the emergence of quantum many-body chaos for tunably-broken integrability
Sounak Biswas, Sthitadhi Roy, Roderich Moessner
We develop a quantitative theory for the emergence of quantum many-body chaos as integrability is broken via a tunable parameter. In a circuit model of free fermions, 'doped' with…
How many-body chaos emerges in the presence of quasiparticles
Sibaram Ruidas, Sthitadhi Roy, Subhro Bhattacharjee +1
Many-body chaos is a default property of many-body systems; at the same time, near-integrable behaviour due to weakly interacting quasiparticles is ubiquitous throughout condensed…
Multifractality in high-dimensional graphs induced by correlated radial disorder
David E. Logan, Sthitadhi Roy
We introduce a class of models containing robust and analytically demonstrable multifractality induced by disorder correlations. Specifically, we investigate the statistics of eige…
Spectral Multifractality and Emergent Energyscales Across the Many-Body Localisation Transition
Sthitadhi Roy
We present a scaling theory of the many-body localisation transition in terms of emergent, characteristic energyscales. The analysis is based on the decomposition of the eigenstate…
Measurement-invisible quantum correlations in scrambling dynamics
Alan Sherry, Sthitadhi Roy
Scrambling unitary dynamics in a quantum system transmutes local quantum information into a non-local web of correlations which manifests itself in a complex spatio-temporal patter…
Logarithmic entanglement lightcone from eigenstate correlations in the many-body localised phase
Ratul Thakur, Bikram Pain, Sthitadhi Roy
We investigate the operator entanglement of the time-evolution operator through the framework of eigenstate correlations. Focusing on strongly disordered quantum many-body systems…