Diagonal composite order in two-channel Kondo lattice

Details Diagonal composite order in two-channel Kondo lattice Diagonal composite order in two-channel Kondo lattice

2011-08-24

arxiv.org/abs/1108.4788v1

Physical Review Letters, 107 (2011) 247202

Physics

Condensed Matter

Strongly Correlated Electrons

5pages, 4figures

Scientific paper

10.1103/PhysRevLett.107.247202

A novel type of symmetry breaking is reported for the two-channel Kondo lattice where conduction electrons have spin and orbital (channel) degrees of freedom. Using the continuous-time quantum Monte Carlo and the dynamical mean-field theory, a spontaneous breaking of the orbital symmetry is observed. The tiny breakdown of orbital occupation number, however, vanishes if the conduction electrons have the particle-hole symmetry. The proper order parameter instead is identified as a composite quantity representing the orbital-selective Kondo effect. The single-particle spectrum of the selected orbital shows insulating property, while the other orbital behaves as Fermi liquid. This composite order is the first example of odd-frequency order other than off-diagonal order (superconductivity), and is a candidate of hidden order in $f$-electron systems.

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