Probing relaxation dynamics of a few strongly correlated bosons in a 1D triple well optical lattice

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Vol. 52; no. 21; pp. 215303 - 215312
• Main Authors: Bera, S, Roy, R, Gammal, A, Chakrabarti, B, Chatterjee, B
• Format: Journal Article
• Language: English
• Published: IOP Publishing 14.11.2019
• Subjects: information entropy; interaction quench; lattice depth quench
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/1361-6455/ab2999

The relaxation process of a few strongly interacting bosons in a triple well optical lattice is studied from the first principle using the multiconfigurational time-dependent Hartree method for bosons. We report the contrasting response of the system under two independent quench processes: an interaction quench and a lattice depth quench. We analyze the evolution of the reduced one-body density matrix, two-body density and the Shannon information entropy for a wide range of lattice depth and interaction strength parameters. For the strong interaction quench, we observe a very fast relaxation to the steady state. In contrast, for the lattice depth quench, we observe collapse-revival dynamics in all the key measures. We also provide the best fitting formulas for relaxation and revival time which follow power law decay.