Quantum Dynamical Echoes in the Spin 'Diffusion' in Mesoscopic Systems

Details Quantum Dynamical Echoes in the Spin 'Diffusion' in Mesoscopic Systems Quantum Dynamical Echoes in the Spin 'Diffusion' in Mesoscopic Systems

1996-04-03

arxiv.org/abs/cond-mat/9604019v1

Phys. Rev. Lett. 75, 4310 (1995)

Physics

Condensed Matter

4 pages, Revtex, 3 Figures available upon request

Scientific paper

10.1103/PhysRevLett.75.4310

The evolution of local spin polarization in finite systems involves interference phenomena that give rise to {\bf quantum dynamical echoes }and non-ergodic behavior. We predict the conditions to observe these echoes by exploiting the NMR sequences devised by Zhang et al. [Phys. Rev. Lett. {\bf % 69}, 2149 (1992)], which uses a rare $^{13}$C as {\bf local probe }for a dipolar coupled $^1$H spin system. The non-ideality of this probe when testing mesoscopic systems is carefully analyzed revealing the origin of various striking experimental features.

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