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Electronic transport in semiconductor nanostructures Thomas Ihn ETH Zürich FS 17 After this lecture you know and understand… • … quantum interference in diffusive wires • ... why conductance flutuations in diffusive systems have a universal amplitude of e2/h • ... the weak localization phenomenon • ... the qualitative importance of the phase coherence length or time Book: Chapters 14.8, 15.1-5 Weak localization Particle diffusion on time-reversed paths Magnetic field dependent resistance Logarithmic temperature dependence of the resistance in diffusive thin films Temperature dependent phase coherence time Interference phenomena in diffusive 2DEGs Diffusive wire Universal conductance fluctuations 2DEG Weak localization Interference Quantum Mechanics Singly connected ballistic systems Mesoscopic condutance fluctuations Diffusive mesoscopic systems Taylor, 1988 Mesoscopic condutance fluctuations Diffusive mesoscopic systems Numerical calculation (Datta, 1988) Mesoscopic condutance fluctuations Reading Chapter 14.8: Conductance fluctuations Chapter 15.1-4: Weak localization effect