TY  - JOUR
A1  - Hu, Huanzhi
A1  - Krüger, Frank
UR  - http://dx.doi.org/10.1103/physrevlett.133.146603
SN  - 0031-9007
N2  - 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
VL  - 133
AV  - public
IS  - 14
TI  - Nature of Topological Phase Transition of Kitaev Quantum Spin Liquids
PB  - American Physical Society (APS)
N1  - 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.
ID  - discovery10198187
Y1  - 2024/10/02/
JF  - Physical Review Letters
ER  -