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DY: Fachverband Dynamik und Statistische Physik

DY 29: Nonequilibrium Quantum Many-Body Systems 2 (joint session TT/DY)

DY 29.3: Vortrag

Dienstag, 17. März 2020, 14:30–14:45, HSZ 204

Periodically Driven Manybody System: a Density Matrix Renormalization Group Study — •Imke Schneider¹, Shaon Sahoo², and Sebastian Eggert¹ — ¹Department of Physics and Research Center Optimas, Technical University of Kaiserslautern, 67663 Kaiserslautern, Germany — ²Department of Physics, Indian Institute of Technology Tirupati, Tirupati 517506, India

Driving a quantum system periodically in time can profoundly alter its long-time dynamics and trigger exotic quantum states of matter. We propose a new DMRG method which directly deals with the Fourier components of the eigenstates of a periodically driven system using Floquet theory. With this new method we can go beyond effective Hamiltonians and take into account higher Floquet modes. Numerical results are presented for the isotropic Heisenberg antiferromagnetic spin-1/2 chain under both local (edge) and global driving for energies, spin-spin correlation and temporal fluctuations. As the frequency is lowered, the spin system enters into a Floquet regime with coherent excitations of a large number of Floquet modes, which shows characteristic quantum correlations that cannot be described by any effective static model.