Field-controlled multicritical behavior and emergent universality in fully frustrated quantum magnets

Fan，Yuchen1; Xi，Ning2; Liu，Changle3,4; Normand，Bruce5,6; Yu，Rong2,7

2024-12-01

10.1038/s41535-024-00636-4

npj Quantum Materials   影响因子和分区

2397-4648

Phase transitions in condensed matter are a source of exotic emergent properties. We study the fully frustrated bilayer Heisenberg antiferromagnet to demonstrate that an applied magnetic field creates a previously unknown emergent criticality. The quantum phase diagram contains four states with distinctly different symmetries, all but one pair separated by first-order transitions. We show by quantum Monte Carlo simulations that the thermal phase diagram is dominated by a wall of discontinuities extending between the dimer-triplet phases and the singlet-containing phases. This wall is terminated at finite temperatures by a critical line, which becomes multicritical where the Berezinskii-Kosterlitz-Thouless (BKT) transition of the dimer-triplet antiferromagnet and the thermal Ising transition of the singlet-triplet crystal phase also terminate. The combination of merging symmetries leads to a 4-state Potts universality not contained in the microscopic Hamiltonian, which we interpret within the Ashkin-Teller model. Our results represent a systematic step in understanding emergent phenomena in quantum magnetic materials, including the “Shastry-Sutherland compound” SrCu(BO).

SCI

英语

其他

2-s2.0-85186870384

Scopus

1.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China
2.Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices,Renmin University of China,Beijing,100872,China
3.School of Engineering,Dali University,Dali,Yunnan,671003,China
4.Shenzhen Institute for Quantum Science and Technology and Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
5.Laboratory for Theoretical and Computational Physics,Paul Scherrer Institute,Villigen-PSI,CH-5232,Switzerland
6.Institute of Physics,Ecole Polytechnique Fédérale de Lausanne (EPFL),Lausanne,CH-1015,Switzerland
7.Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education),Renmin University of China,Beijing,100872,China

Fan，Yuchen,Xi，Ning,Liu，Changle,et al. Field-controlled multicritical behavior and emergent universality in fully frustrated quantum magnets[J]. npj Quantum Materials,2024,9(1).

Fan，Yuchen,Xi，Ning,Liu，Changle,Normand，Bruce,&Yu，Rong.(2024).Field-controlled multicritical behavior and emergent universality in fully frustrated quantum magnets.npj Quantum Materials,9(1).

Fan，Yuchen,et al."Field-controlled multicritical behavior and emergent universality in fully frustrated quantum magnets".npj Quantum Materials 9.1(2024).