Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-14
Physica B 359-361, 77 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 1 fig, submitted to SCES04 proceedings
Scientific paper
10.1016/j.physb.2004.12.062
We discuss quantum phase transitions in the pseudogap Kondo problem, which describes a magnetic moment coupled to conduction electrons with a power-law density of states, rho(omega) ~ |omega|^r. We show that different perturbative expansions, together with renormalization group techniques, provide effective low-energy field theories for the relevant critical fixed points. In particular, we review expansions near the lower-critical and upper-critical dimensions of the problem, being r=0 and r=1, respectively.
Fritz Lars
Kircan Marijana
Vojta Matthias
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