Dynamic-RKKY induced time-reversal symmetry breaking and chiral spin liquids

• Main Authors: Shao, Siqi, Ge, Yang, Komijani, Yashar
• Format: Journal Article
• Language: English
• Published: 30-09-2024
• Subjects: Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.2409.20532

We study the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in various
Kondo lattice systems. We argue that the weak Kondo-coupling expansion contains
certain physics which is lost in the usual static approximation to the spin
susceptibility. Most notably, while the former is sensitive to the
time-reversal symmetry breaking, the latter is blind to it. Using exact
diagonalization on small systems, we show that this enables inducing spin
chirality by an external magnetic field. To study larger systems, we use a
large-N approximation to capture the effect of dynamic-RKKY interaction on U(1)
spin liquids. On a honeycomb Kondo lattice with Haldane fluxes for electrons,
we show that the non-trivial topology and chiral edge states are induced on the
spinons. Our results suggest that dynamic RKKY in combination with external
magnetic field or in proximity to topological electronic materials, can be used
as a tunable Dzyaloshinskii-Moriya even in centrosymmetric materials.