<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms"^^ . "In this thesis, we present the realization of an isolated Heisenberg XXZ spin 1/2 system with an off-diagonal\r\ndisorder in the coupling constants using cold atoms in highly excited Rydberg states. We select a set of\r\nRydberg states that interact via van der Waals interaction which can be mapped onto an interacting spin\r\nsystem. We investigate the out-of-equilibrium dynamics of the spin system after it has been initialized in\r\na fully magnetized state. Following unitary evolution governed by the Heisenberg spin Hamiltonian, we\r\nmeasure the magnetization as a function of the evolution time. By fitting a stretched exponential function\r\nto the resulting magnetization dynamics be obtain a stretched exponent of β = 0.32 revealing a slow\r\nrelaxation of the spin system, similar to what is found in spin glasses. By choice, the initial state is an\r\neigenstate of the mean-field Hamiltonian and thus the observed relaxation indicates that the dynamics are\r\ntriggered by quantum fluctuations. We find that varying the distribution of coupling constants by means\r\nof the so-called dipole blockade effect has no impact on the stretching exponent indicating that it is\r\na universal parameter of the system independent of the microscopic details for the range of disorder\r\nexplored in the experiment. It also allows us to combine the different datasets by re-scaling the time\r\ndomain with the characteristic interaction strength. The combined datasets expand our measurements to\r\ntwo orders of magnitude in the re-scaled time-domain showing that slow dynamics is a persistent effect\r\nfor long evolution times."^^ . "2022" . . . . . . . "Renato"^^ . "Ferracini Alves"^^ . "Renato Ferracini Alves"^^ . . . . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (PDF)"^^ . . . "20220413 renato ferracini alves dissertation final.pdf"^^ . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Realization of a Heisenberg XXZ spin system using Rydberg atoms (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #31511 \n\nRealization of a Heisenberg XXZ spin system using Rydberg atoms\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .