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