Diagonal composite order in two-channel Kondo lattice

Abstract

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.

5pages, 4figures

References in corpus (5)

• Continuous-time Monte Carlo methods for quantum impurity models
• Kondo Effects and Multipolar Order in the cubic PrTr2Al20 (Tr=Ti, V)
• Continuous-Time Quantum Monte Carlo Method for the Coqblin-Schrieffer Model
• Electronic Order with Staggered Kondo and Crystalline Electric Field Singlets
• Kondo lattice model at half-filling

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