Weak localization is a quantum interference phenomenon observed in disordered systems, typically in the context of electronic transport in metals and semiconductors. It is characterized by the enhancement of backscattering processes due to the coherent nature of quantum mechanics. Here's a more detailed explanation: 1. **Quantum Interference**: In disordered materials, electrons can take multiple paths to move from one point to another. Due to quantum superposition, these paths can interfere with each other.
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Interference of time-reversed multiple-scattering paths can enhance return probability and reduce conductance in a coherent disordered conductor with the appropriate symmetries. Magnetic fields, spin-orbit coupling and dephasing alter or suppress the correction; some symmetry classes exhibit antilocalization. This small-correction regime must be distinguished from strong Anderson localization.