Physics – Condensed Matter
Scientific paper
1996-07-29
Physics
Condensed Matter
20 pages, 4 figures, RevTex format, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.55.6832
Tunnelling impurities in metals have been known for some time to have the potential for exhibiting Kondo-like physics. However previous models based on an impurity hopping between two equivalent positions have run into trouble due to the existence of relevant operators that drive the system away from the non-Fermi-liquid Kondo fixed point. In the case of an impurity hopping among positions with higher symmetry, such as triangular symmetry, it is shown here that the non-Fermi-liquid behavior at low temperatures can be generic. Using various bosonization techniques, the fixed point is shown to be {\em stable}. However, unlike the conventional two-channel Kondo (2CK) model, it has {\em four} leading irrelevant operators, implying that while the form of the singular temperature dependence of physical quantities is similar to the 2CK model, there will not be simple universal amplitude ratios. The phase diagram of this system is analyzed and a critical manifold is found to separate the non-Fermi-liquid from a conventional Fermi liquid fixed point. Generalization to higher symmetries, such as cubic, and the possibility of physical realizations with dynamic Jahn-Teller impurities is discussed.
Fisher Daniel S.
Moustakas Aris L.
No associations
LandOfFree
Two-Channel Kondo Physics from Tunnelling Impurities with Triangular Symmetry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Two-Channel Kondo Physics from Tunnelling Impurities with Triangular Symmetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-Channel Kondo Physics from Tunnelling Impurities with Triangular Symmetry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-629027