Critical Ising modes in low-dimensional Kondo insulators
Abstract
We present an Ising-like intermediate phase for one-dimensional Kondo insulator systems. Resulting from a spinon splitting, its low-energy excitations are critical Ising modes, whereas the triplet sector has a spectral gap. It should occur as long as the Ruderman-Kittel-Kasuya-Yosida oscillation amplitude dominates over any direct exchange between localized spins. The chiral fixed point, however, becomes unstable in the far-infrared limit due to prevalent fluctuations among localized spins that induce gapless triplet excitations in the spectrum. Based on previous numerical results, we obtain a paramagnetic disordered state ruled by the correlation length of the single impurity Kondo model.
- Publication:
-
Physical Review B
- Pub Date:
- September 1999
- DOI:
- 10.1103/PhysRevB.60.9116
- arXiv:
- arXiv:cond-mat/9904006
- Bibcode:
- 1999PhRvB..60.9116L
- Keywords:
-
- 71.10.Pm;
- 71.27.+a;
- 72.15.Qm;
- 75.10.Jm;
- Fermions in reduced dimensions;
- Strongly correlated electron systems;
- heavy fermions;
- Scattering mechanisms and Kondo effect;
- Quantized spin models;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 7 pages, RevTeX