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Diagonal composite order in a two-channel Kondo lattice
Shintaro Hoshino1, Junya Otsuki, Yoshio Kuramoto
1Department of Physics, Tohoku University, Sendai 980-8578, Japan.
Physical Review Letters
|January 17, 2012
Summary
A novel orbital symmetry breaking occurs in two-channel Kondo lattice systems. This leads to an orbital-selective Kondo effect, a new type of odd-frequency order potentially found in f-electron systems.
Area of Science:
- Condensed matter physics
- Quantum magnetism
- Many-body physics
Background:
- Two-channel Kondo lattice models exhibit complex electronic behaviors.
- Symmetry breaking is a key phenomenon in understanding exotic phases of matter.
- Orbital degrees of freedom in conduction electrons add complexity to Kondo physics.
Purpose of the Study:
- To investigate a novel type of symmetry breaking in the two-channel Kondo lattice.
- To identify the order parameter associated with this symmetry breaking.
- To explore the implications for exotic electronic orders, particularly in f-electron systems.
Main Methods:
- Utilized continuous-time quantum Monte Carlo (CT-QMC) simulations.
- Employed dynamical mean-field theory (DMFT) for theoretical analysis.
- Analyzed single-particle spectra and orbital occupation numbers.
Main Results:
- Observed spontaneous breaking of orbital symmetry in the two-channel Kondo lattice.
- Identified a composite quantity as the proper order parameter for an orbital-selective Kondo effect.
- Demonstrated that the single-particle spectrum becomes insulating in one orbital while the other remains a Fermi liquid.
- Showed that particle-hole symmetry in conduction electrons prevents orbital occupation number breakdown.
Conclusions:
- Introduced a novel composite order parameter representing an orbital-selective Kondo effect.
- This represents the first example of odd-frequency order beyond superconductivity.
- The findings suggest a potential candidate for hidden order phenomena in f-electron systems.
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