Anika Götz, Martin Hohenadler, and Fakher F. Assaad
Phys. Rev. B 109, 195154 (2024) – Published 16 May 2024
The authors study here a Su-Schrieffer-Heeger model on a square lattice by auxiliary-field quantum Monte Carlo. A novel approach allows analytical integration over the phonons, considerably reducing autocorrelation times and allowing investigation of new regions of the phase diagram. By varying the strength of the direct hopping at the O(4) symmetric point, they discover novel phases in this textbook model. In particular, for small values of the direct hopping, they observe emergent orthogonal Dirac fermions, with an exotic quantum phase transition akin to deconfined quantum criticality.
Phys. Rev. B 109, L201118 (2024) – Published 16 May 2024
The authors construct here a low-energy model for CeSiI, a new van der Waals (vdW) material that exhibits heavy Fermi liquid behaviour coexisting with magnetic order. Using Abrikosov mean field theory, they observe that the unique geometry of the material facilitates the existence of a nematic heavy Fermi liquid phase as well as a coexistence of heavy Fermi liquid and magnetic order phase. In particular, it is shown that an electric field applied perpendicular to the material consolidates the coexistence phase, demonstrating the high tunability of this new vdW heavy fermion material.
Hanlin Wu, Sheng Li, Yan Lyu, Yucheng Guo, Wenhao Liu, Ji Seop Oh, Yichen Zhang, Sung-Kwan Mo, Clarina dela Cruz, Robert J. Birgeneau, Keith M. Taddei, Ming Yi, Li Yang, and Bing Lv
Phys. Rev. B 109, 174427 (2024) – Published 15 May 2024
