Condensed Matter Physics Seminar
2 p.m., Thursday, October 3, 2002
Room 1201, Physics Building
Zero-dimensional Fermi liquid
(Princeton/NECI)
Abstract: What does it mean - Fermi liquid? In spite of the fact
that this paradigms discussed for almost half a century there are still
disagreements about its very meaning. In its original version the Fermi liquid
theory interacting fermions was based on the translation invariance, i.e., on
the fact that each elementary excitation can be characterized by its momentum.
Does it mean that any quenched disorder destroys the Fermi liquid state? In
order to get an insight we will consider general properties of interacting
fermions confined within a finite volume. It turns out that in the
case when one-particle motion is chaotic the theoretical description of the
system can be dramatically simplified. More precisely, the low energy
behavior is determined by a zero-dimensional Hamiltonian, which contains at most
three unknown coupling constants. We will see that this description is in all
respects similar to the Fermi-liquid one. To illustrate this Fermi-liquid-like
approach we will discuss effects of the exchange interaction on the charge
transport through Quantum Dots.
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Host: Prange
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