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Confined Phases of One-Dimensional Spinless Fermions Coupled to Z(2) Gauge Theory
Germany.
Germany.
USA.
Germany.ORCID iD: 0000-0002-4615-2507
2020 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 124, no 12Article in journal (Refereed) Published
Abstract [en]

We investigate a quantum many-body lattice system of one-dimensional spinless fermions interacting with a dynamical Z(2) gauge field. The gauge field mediates long-range attraction between fermions resulting in their confinement into bosonic dimers. At strong coupling we develop an exactly solvable effective theory of such dimers with emergent constraints. Even at generic coupling and fermion density, the model can be rewritten as a local spin chain. Using the density matrix renormalization group the system is shown to form a Luttinger liquid, indicating the emergence of fractionalized excitations despite the confinement of lattice fermions. In a finite chain we observe the doubling of the period of Friedel oscillations which paves the way towards experimental detection of confinement in this system. We discuss the possibility of a Mott phase at the commensurate filling 2/3.

Place, publisher, year, edition, pages
American Physical Society, 2020. Vol. 124, no 12
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-87160DOI: 10.1103/PhysRevLett.124.120503ISI: 000522195100002OAI: oai:DiVA.org:kau-87160DiVA, id: diva2:1611627
Available from: 2021-11-15 Created: 2021-11-15 Last updated: 2023-06-20Bibliographically approved

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Moroz, Sergej

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