Clustering and decoherence of correlated spins under double quantum dynamics

CLAUDIA M. SÁNCHEZ; RODOLFO ACOSTA; PATRICIA R. LEVSTEIN; ANA K. CHATTAH; HORACIO M. PASTAWSKI

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Lugar: New York; Año: 2014 vol. 90 p. 42122 - 42132

1050-2947

Clustering and decoherence of correlated spins under double quantum dynamics  C.M. Sánchez, R.H. Acosta, P.R. Levstein, H.M. Pastawski, and A.K. Chattah Phys. Rev. A 90, 042122 (2014) We present an improved approach for the study of the evolution of spin correlations and decoherence inmultiple quantum nuclear magnetic resonance experiments. The infinite system, constituted by the protons of apolycrystalline adamantane sample, evolves under a double quantum Hamiltonian. The distribution of multiplequantum coherence orders is represented by a contribution of spin clusters with different sizes that exchangespins, increasing their size with the evolution time. A cluster with nearly exponential growth at all times isobserved, in agreement with previous models. Remarkably, a small cluster that stabilizes in a size correspondingto 18 correlated spins is revealed. In addition, by performing a renormalization of the obtained data with theexperimental Loschmidt echo, the contribution of the different clusters to the observable signal is determined.This procedure accounts for the effect of decoherence on the evolution of the system, and allows setting the rangeof confidence of the experimental data. Our analysis confirms the natural hint that, correlated states involvinghigher coherence orders are far more sensitive to the uncontrolled decoherent interactions, than those involvinglower orders.