eprintid: 10198187 rev_number: 7 eprint_status: archive userid: 699 dir: disk0/10/19/81/87 datestamp: 2024-10-08 11:01:42 lastmod: 2024-10-08 11:01:42 status_changed: 2024-10-08 11:01:42 type: article metadata_visibility: show sword_depositor: 699 creators_name: Hu, Huanzhi creators_name: Krüger, Frank title: Nature of Topological Phase Transition of Kitaev Quantum Spin Liquids ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F60 divisions: F64 note: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. abstract: We investigate the nature of the topological quantum phase transition between the gapless and gapped Kitaev quantum spin liquid phases away from the exactly solvable point. The transition is driven by anisotropy of the Kitaev couplings. At the critical point, the two Dirac points of the gapless Majorana modes merge, resulting in the formation of a semi-Dirac point with quadratic and linear band touching directions. We derive an effective Gross-Neveu-Yukawa-type field theory that describes the topological phase transition in the presence of additional magnetic interactions. We obtain the infrared scaling form of the propagator of the dynamical Ising order parameter field and perform a renormalization-group analysis. The universality of the transition is found to be different from that of symmetry-breaking phase transitions of semi-Dirac electrons. However, as in the electronic case, the Majorana fermions acquire an anomalous dimension, indicative of the breakdown of the fractionalized quasiparticle description. Published by the American Physical Society 2024 date: 2024-10-02 date_type: published publisher: American Physical Society (APS) official_url: http://dx.doi.org/10.1103/physrevlett.133.146603 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2324956 doi: 10.1103/physrevlett.133.146603 lyricists_name: Hu, Huanzhi lyricists_name: Kruger, Frank lyricists_id: HHUAX88 lyricists_id: FKRUG35 actors_name: Kruger, Frank actors_id: FKRUG35 actors_role: owner full_text_status: public publication: Physical Review Letters volume: 133 number: 14 article_number: 146603 issn: 0031-9007 citation: Hu, Huanzhi; Krüger, Frank; (2024) Nature of Topological Phase Transition of Kitaev Quantum Spin Liquids. Physical Review Letters , 133 (14) , Article 146603. 10.1103/physrevlett.133.146603 <https://doi.org/10.1103/physrevlett.133.146603>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10198187/1/Kitaev_top.pdf