Quantum Critical Points in Quantum Impurity Systems

Details Quantum Critical Points in Quantum Impurity Systems Quantum Critical Points in Quantum Impurity Systems

2004-06-23

arxiv.org/abs/cond-mat/0406557v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 3 figures, submitted to SCES'04

Scientific paper

10.1016/j.physb.2004.12.055

The numerical renormalization group method is used to investigate zero temperature phase transitions in quantum impurity systems, in particular in the soft-gap Anderson model, where an impurity couples to a non-trivial fermionic bath. In this case, zero temperature phase transitions occur between two different phases whose fixed points can be built up of non-interacting single-particle states. However, the quantum critical point cannot be described by non-interacting fermionic or bosonic excitations.

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