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Condensed Matter > Strongly Correlated Electrons
Title: Dynamic mass generation and topological order in overscreened Kondo lattices
(Submitted on 6 Mar 2023 (v1), last revised 29 Mar 2024 (this version, v2))
Abstract: Multichannel Kondo lattice models are examples of strongly correlated electronic systems that exhibit non-Fermi-liquid behavior due to the presence of a continuous channel symmetry. Mean-field analyses have predicted that these systems undergo channel symmetry breaking at low temperature. We use the dynamical large-$N$ technique to study temporal and spatial fluctuations of the multichannel Kondo model on a honeycomb lattice and find that this prediction is not generally true. Rather, we find a 2+1D conformally invariant fixed point, governed by critical exponents that are found numerically. When we break time-reversal symmetry by adding a Haldane mass to the conduction electrons, three phases, separated by continuous transitions, are discernible: one characterized by dynamic mass generation and spontaneous breaking of the channel symmetry, one where topological defects restore channel symmetry but preserve the gap, and one with a Kondo-coupled chiral spin liquid. We argue that the last phase is a fractional Chern insulator with anyonic excitations.
Submission history
From: Yang Ge [view email][v1] Mon, 6 Mar 2023 18:43:38 GMT (7122kb,D)
[v2] Fri, 29 Mar 2024 21:07:30 GMT (12323kb,D)
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