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Thermodynamics of a gauge-frustrated Kitaev spin liquid
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2019 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 1, no 3, article id 032011Article in journal (Refereed) Published
Abstract [en]

Two- and three-dimensional Kitaev magnets are prototypical frustrated quantum spin systems, in which the original spin degrees of freedom fractionalize into Majorana fermions and a Z2 gauge field - a purely local phenomenon that reveals itself as a thermodynamic crossover at a temperature scale set by the strength of the bond-directional interactions. For conventional Kitaev magnets, the low-temperature thermodynamics reveals a second transition at which the Z2 gauge field orders and the system enters a spin-liquid ground state. Here, we discuss an explicit example that goes beyond this paradigmatic scenario - the Z2 gauge field is found to be subject to geometric frustration, the thermal ordering transition is suppressed, and an extensive residual entropy arises. Deep in the quantum regime, at temperatures of the order of one per mil of the interaction strength, the degeneracy in the gauge sector is lifted by a subtle interplay between the gauge field and the Majorana fermions, resulting in the formation of a Majorana metal. We discuss the thermodynamic signatures of this physics obtained from large-scale, sign-free quantum Monte Carlo simulations.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2019. Vol. 1, no 3, article id 032011
Keywords [en]
Degrees of freedom (mechanics), Gages, Ground state, Magnets, Monte Carlo methods, Spin fluctuations, Directional interactions, Geometric frustration, Interaction strength, Low temperature thermodynamics, Quantum Monte Carlo simulations, Quantum spin systems, Spin degrees of freedom, Thermodynamic crossover, Temperature
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-313933DOI: 10.1103/PhysRevResearch.1.032011ISI: 000600581900001Scopus ID: 2-s2.0-85078398712OAI: oai:DiVA.org:kth-313933DiVA, id: diva2:1668648
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QC 20220613

Available from: 2022-06-13 Created: 2022-06-13 Last updated: 2022-12-19Bibliographically approved

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Hermanns, Maria

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