Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.108.070603
Title: Quantum Hyperdiffusion in one-dimensional tight-binding lattices
Authors: Zhang, Z.
Tong, P.
Gong, J. 
Li, B. 
Issue Date: 15-Feb-2012
Source: Zhang, Z., Tong, P., Gong, J., Li, B. (2012-02-15). Quantum Hyperdiffusion in one-dimensional tight-binding lattices. Physical Review Letters 108 (7) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.108.070603
Abstract: Transient quantum hyperdiffusion, namely, faster-than-ballistic wave packet spreading for a certain time scale, is found to be a typical feature in tight-binding lattices if a sublattice with on-site potential is embedded in a uniform lattice without on-site potential. The strength of the sublattice on-site potential, which can be periodic, disordered, or quasiperiodic, must be below certain threshold values for quantum hyperdiffusion to occur. This is explained by an energy band mismatch between the sublattice and the rest uniform lattice and by the structure of the underlying eigenstates. Cases with a quasiperiodic sublattice can yield remarkable hyperdiffusion exponents that are beyond three. A phenomenological explanation of hyperdiffusion exponents is also discussed. © 2012 American Physical Society.
Source Title: Physical Review Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/97684
ISSN: 00319007
DOI: 10.1103/PhysRevLett.108.070603
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