non-perturbative treatment of quantum impurity problems in real lattices
Historically, the RKKY or indirect exchange, interaction has been accepted as being able to be described by second order perturbation theory. A typical universal expression is usually given in this context. This approach, however, fails to incorporate many body ef- fects, quantum fluctuations, and o...
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| Online Access: | http://hdl.handle.net/2047/D20261322 |