Quantum phase coherence in non-Markovian and reaction-diffusive transport

Article

关键词: METAL-INSULATOR-TRANSITION;    SCALING THEORY;    SYSTEMS;    LOCALIZATION;    ABSENCE;   

DOI  :  10.1103/PhysRevB.82.054201

来源: SCIE

【 摘 要 】

We study quantum phase coherence and weak localization in disordered metals with restricted backscattering and phenomenologically formulate a large class of unconventional transport mechanisms as modified diffusion processes not captured by the Boltzmann picture. Inspired by conductivity measurements in ferromagnetic films and semiconductors where anomalous power-law corrections have been observed, we constrain memory-dependent, self-avoidance effects onto the quantum-enhanced backscattered trajectories, drastically altering the effect of weak localization in two dimensions (2D). Scale-dependent corrections to the conductivity fail to localize the electrons in d >= 2 for sufficiently weak disorder. Additionally, we analyze quantum transport in reaction-diffusion systems governed by the Fisher's equation and observe asymptotically similar delocalization in 2D. Such unconventional transport might be relevant to certain non-Fermi liquid or strongly correlated phases in 2D within the negative compressibility regime.

【 授权许可】

Free