6 papers
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…
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…
Discrete Time Crystals in the spin-s Central Spin Model
Hillol Biswas, Sayan Choudhury
We propose periodic driving protocols to realize discrete time crystals (DTCs) in a spin-s central spin model. Interestingly, we identify parameter regimes, where eternal period-do…
Counterdiabatic Route to Entanglement Steering and Dynamical Freezing in the Floquet Lipkin-Meshkov-Glick Model
Nakshatra Gangopadhay, Sayan Choudhury
Controlling the dynamics of quantum many-body systems is crucial for developing quantum technologies. This work demonstrates that counter-diabatic (CD) driving provides a powerful…