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Professor Chandrasekhar Ramanathan, Department of Physics and Astronomy, Dartmouth College
Title: "Experimental Characterization of an Integrable Kicked Spin Chain"
Abstract: Solid state spin systems are excellent platforms on which to study coherent dynamics of large quantum systems. Using solid state NMR we have been able to characterize many-spin dynamics in the cubic spin lattice of calcium fluoride and the quasi-one-dimensional system fluorapatite. Of particular interest are experiments that use multiple-pulse coherent averaging techniques to implement an effective double quantum (DQ) Hamiltonian in the fluorapatite system. In one dimension the DQ Hamiltonian is analytically solvable in the limit of nearest-neighbor couplings, and is related by a similarity transformation to the isotropic XY Hamiltonian. In this talk I will review our recent experimental results studying the dynamics of the spin system in response to a series of controlled perturbations applied as periodic ``kicks’’ to the system. In the current experiments the system remains integrable in the presence of these kicks. We are also exploring the possibility of inducing a crossover from integrable to chaotic dynamics in this system by selectively controlling the perturbations used.
Events are free and open to the public unless otherwise noted.