title: Extending the electron spin coherence time of atomic hydrogen by dynamical decoupling.
abstract: We study the electron spin decoherence of encapsulated atomic hydrogen in octasilsesquioxane cages induced by the (1)H and (29)Si nuclear spin bath. By applying the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence we significantly suppress the low-frequency noise due to nuclear spin flip-flops up to the point where a maximum T2 = 56 μs is observed. Moreover, dynamical decoupling with the CPMG sequence reveals the existence of two other sources of decoherence: first, a classical magnetic field noise imposed by the (1)H nuclear spins of the cage organic substituents, which can be described by a virtual fluctuating magnetic field with the proton Larmor frequency, and second, decoherence due to anisotropic hyperfine coupling between the electron and the inner (29)Si spins of the cage.
authors.affiliation: Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, NCSR Demokritos, 15310 Athens, Greece. mitrikas@ims.demokritos.gr.
authors.forename: George
authors.initials: G
authors.lastname: Mitrikas
authors.forename: Eleni K
authors.initials: EK
authors.lastname: Efthimiadou
authors.forename: George
authors.initials: G
authors.lastname: Kordas