A Wigner chain in a periodic potential is a paradigmatic example of geometric frustration with long-range interactions. The dynamics emulates the Frenkel-Kontorova model with Coulomb interactions. In the continuum approximation, dislocations are sine-Gordon solitons with power-law decaying tails. We show that their action is mapped into a massive, long-range (1+1) + 1) Thirring model, in which the solitons are charged fermionic excitations over an effective Dirac sea. We identify the corresponding mean-field theory and show that the Coulomb interactions destabilize structures commensurate with the periodic substrate, suppressing their onset and giving rise to interaction-induced lubrication. Our study identifies the role of long-range interactions on determining nanofriction. Our predictions can be probed in state-of-the-art trapped ion experiments.

Quantum frustrated Wigner chains

Malo, Jorge Yago;Chiofalo, Maria Luisa;
2024-01-01

Abstract

A Wigner chain in a periodic potential is a paradigmatic example of geometric frustration with long-range interactions. The dynamics emulates the Frenkel-Kontorova model with Coulomb interactions. In the continuum approximation, dislocations are sine-Gordon solitons with power-law decaying tails. We show that their action is mapped into a massive, long-range (1+1) + 1) Thirring model, in which the solitons are charged fermionic excitations over an effective Dirac sea. We identify the corresponding mean-field theory and show that the Coulomb interactions destabilize structures commensurate with the periodic substrate, suppressing their onset and giving rise to interaction-induced lubrication. Our study identifies the role of long-range interactions on determining nanofriction. Our predictions can be probed in state-of-the-art trapped ion experiments.
2024
Menu, Raphaël; Malo, Jorge Yago; Vuletić, Vladan; Chiofalo, Maria Luisa; Morigi, Giovanna
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1276767
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