2017/02/28 by Haiyuan Zou, Erhai Zhao, Wen-Yuan Liu +1
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Dipole #Ground state #Ising model #Magnetism #Paramagnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Square (algebra) #Square lattice #cond-mat.quant-gas #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevlett.119.050401
published as Phys. Rev. Lett. 119, 050401 (2017) · 5+10 pages, 3+8 figures
openalex publication_date 2017/07/31 · arxiv created 2017/08/02 · arxiv updated 2017/08/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Motivated by the experimental realization of quantum spin models of polar molecule KRb in optical lattices, we analyze the spin 1/2 dipolar Heisenberg model with competing anisotropic, long-range exchange interactions. We show that, by tilting the orientation of dipoles using an external electric field, the dipolar spin system on square lattice comes close to a maximally frustrated region similar, but not identical, to that of the J1-J2 model. This provides a simple yet powerful route to potentially realize a quantum spin liquid without the need for a triangular or kagome lattice. The ground state phase diagrams obtained from Schwinger-boson and spin-wave theories consistently show a spin disordered region between the Néel, stripe, and spiral phase. The existence of a finite quantum paramagnetic region is further confirmed by an unbiased variational ansatz based on tensor network states and a tensor renormalization group.