2013
DOI: 10.1103/physrevb.87.195137
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Analytically tractable model of bad metals

Abstract: We discuss a model Kondo-type Hamiltonian representing an analytically tractable version of the model used by Yin et.al., Phys. Rev. B86, 2399 to explain the non-Fermi liquid behavior of iron chalcogenides and ruthenates in an intermediate energy range. We consider a regime where a complete screening of the local degrees of freedom proceeds in two stages described by two characteristic energy scales T orb K >> E0. The first scale marks a screening of the orbital degrees of freedom and the second one marks a cr… Show more

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Cited by 9 publications
(15 citation statements)
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“…The relevance of multi-channel Kondo physics for the intermediate asymptotics was conjectured and the operator responsible for the crossover to the Fermi liquid at low energies was identified in Ref. [25].…”
mentioning
confidence: 99%
“…The relevance of multi-channel Kondo physics for the intermediate asymptotics was conjectured and the operator responsible for the crossover to the Fermi liquid at low energies was identified in Ref. [25].…”
mentioning
confidence: 99%
“…This perturbed conformal field theory appears in applications such as theories of spin ladders [16] (see also the Appendix). A variant of this theory, perturbing SU (2) k by the trace of the adjoint on the boundary of the system, describes a particular class of Kondo models [17]. Another variant of the model, with an additional current-current perturbation, appeared in the description of fermionic cold atoms loaded into a one-dimensional optical lattice [18,19].The perturbed CFT is not integrable except at k = 2 when it is equivalent to the theory of three massive Majorana fermions.…”
mentioning
confidence: 99%
“…The incoherent regime is characterized by (iii) a fractional power law for the imaginary part of the Matsubara self-energy [20,26,30] and (iv) the coexistence of fast quantum mechanical orbital fluctuations and slow spin fluctuations [20]. However, since ctQMC can not reach truly low temperatures, (i) could not be conclusively established yet, and a more detailed understanding of (ii-iv) is difficult to achieve based on imaginary-frequency data alone.…”
mentioning
confidence: 99%