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Condensed Matter Physics Seminar
Quantum Impurity Entanglement Erik Sorenson
McMaster University | Time | |
Wed. February 7, 2007  10:30 AM Stirling 201 |
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| Abstract | |
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A system that can be divided into two parts A and B is said to be
entangled if the ground-state wavefunction cannot be written as a
product $|A>|B>$. While entanglement is at the foundation of the fields
of quantum information/computing it has recently been recognized as a
crucial concept for understanding quantum critical phenomena,
topological phases and efficient numerical methods as they are used in
the field of condensed matter. In this talk I will try to describe some of these
recent developments from the point of view of both theory and experiment. In
particular, I will focus on entanglement in spin chains and describe
recent work showing how impurities become entangled with the bulk spin
chain. In some cases a simple intuitive picture can be developed allowing
for almost exact variational calculations. |
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