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Transcript 
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
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