Damped Rabi wavepacket oscillations and damping time in correlated random ladders

作者：Caetano R A^*; Lyra M L; Schulz P A

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2013, 54: 157-161.

DOI：10.1016/j.physe.2013.06.017

• Anderson localization
• Correlated disorder
• Wavepacket dynamics
• Quantum wire

In this work, we follow the time evolution of an initially localized one-electron wavepacket in a random ladder model with correlated diagonal disorder. Weak localization of the eigenstates is anticipated for antisymmetric cross-correlations with every base pair having the same average energy. We show that the wavepacket width develops damped Rabi-like oscillations after reaching the ladder's borders. The Rabi-like oscillations are shown to originate from the interference between neighboring energy eigenstates, while its damping is associated with a destructive interference due to the random scattering in the underlying random potential. The typical damping time t(d) is estimated as a function of the ladder size N and shown to increase as t(d)proportional to N-z with z = 0.62(4). The strong localization in the absence of antisymmetric cross-correlations suppresses the oscillations.

• 出版日期2013-12