Competing gauge fields and entropically driven spin liquid to spin liquid transition in non-Kramers pyrochlores

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Daniel Lozano-Gómez - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Theoretical Solid State Physics, University of Waterloo, TUD Dresden University of Technology (Author)
  • Vincent Noculak - , Free University of Berlin, Helmholtz Centre Berlin for Materials and Energy (Author)
  • Jaan Oitmaa - , University of New South Wales (Author)
  • Rajiv R.P. Singh - , University of California at Davis (Author)
  • Yasir Iqbal - , Indian Institute of Technology Madras (IITM) (Author)
  • Johannes Reuther - , Free University of Berlin, Helmholtz Centre Berlin for Materials and Energy, Indian Institute of Technology Madras (IITM) (Author)
  • Michel J.P. Gingras - , University of Waterloo (Author)

Abstract

Gauge theories are powerful theoretical physics tools that allow complex phenomena to be reduced to simple principles and are used in both high-energy and condensed matter physics. In the latter context, gauge theories are becoming increasingly popular for capturing the intricate spin correlations in spin liquids, exotic states of matter in which the dynamics of quantum spins never ceases, even at absolute zero temperature. We consider a spin system on a three-dimensional pyrochlore lattice where emergent gauge fields not only describe the spin liquid behavior at zero temperature but crucially determine the system’s temperature evolution, with distinct gauge fields giving rise to different spin liquid phases in separate temperature regimes. Focusing first on classical spins, in an intermediate temperature regime, the system shows an unusual coexistence of emergent vector and tensor gauge fields where the former is known from classical spin ice systems while the latter has been associated with fractonic quasiparticles, a peculiar type of excitation with restricted mobility. Upon cooling, the system transitions into a low-temperature phase where an entropic selection mechanism depopulates the degrees of freedom associated with the tensor gauge field, rendering the system spin-ice-like. We further provide numerical evidence that in the corresponding quantum model, a spin liquid with coexisting vector and tensor gauge fields has a finite window of stability in the parameter space of spin interactions down to zero temperature. Finally, we discuss the relevance of our findings for non-Kramers magnetic pyrochlore materials.

Details

Original languageEnglish
Article numbere2403487121
JournalProceedings of the National Academy of Sciences of the United States of America
Volume121
Issue number36
Publication statusPublished - 3 Sept 2024
Peer-reviewedYes

External IDs

PubMed 39196626

Keywords

ASJC Scopus subject areas

Keywords

  • competing gauge fields, entropic selection, frustrated magnetism, liquid-to-liquid crossover, spin liquids