9 papers
Coexistence of inequivalent time-crystalline orders in a Floquet collective spin system
Shashank Mishra, Sayan Choudhury
We investigate the dynamical phases that emerge in collective spin models subjected to a spatially non-uniform periodic drive. Taking the paradigmatic Lipkin-Meshkov-Glick (LMG) mo…
Non-equilibrium dynamics of the disordered Power of Two model
Kunal Singh, Sayan Choudhury
Motivated by recent experimental realizations of programmable spin models with long-range interactions, we investigate the non-equilibrium dynamics of the Power-of-Two (PWR2) model…
CFT Perspective On de-Sitter Cosmological Correlators
Sayantan Choudhury
We investigate the principles of quantum field theory using a stiff de Sitter space. We demonstrate that a non-unitary Lagrangian on a Euclidean AdS geometry can produce the pertur…
Dissipation stabilizes Dicke Time Quasicrystals
Sk Anisur, Sayan Choudhury, Shuva Mondal +1
Quasi-periodic driving protocols provide a powerful route to realize novel non-equilibrium phases of matter beyond the Floquet paradigm. However, these protocols inevitably lead to…
Tunably realizing flat-bands and exceptional points in kinetically frustrated systems: An example on the non-Hermitian Creutz ladder
Debashish Dutta, Sayan Choudhury
We study a non-Hermitian extension of the Creutz ladder with generic non-reciprocal hopping. By mapping the ladder onto two decoupled non-Hermitian Su--Schrieffer--Heeger (SSH) cha…
Directional quantum walks of two bosons on the Hatano-Nelson lattice
Sk Anisur, Kartik Singh, Sayan Choudhury
We theoretically investigate the interplay of interactions and non-Hermiticity in the dynamics of two bosons on the one-dimensional Hatano-Nelson lattice with non-reciprocal tunnel…