2021/04/30 by Jianwei Yang, Anders W. Sandvik, Ling Wang · 95 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Criticality #Gapless playback #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum critical point #Quantum many-body systems #Quantum mechanics #Quantum phase transition #Quantum spin liquid #Spin (aerodynamics) #Spin model #Spin polarization #Thermodynamics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.105.l060409
published in Physical review. B./Physical review. B 105(6) (American Physical Society) · 12 pages 12 figs, v3: minor additions
openalex created_date 2021/04/26 · openalex publication_date 2022/02/23 · arxiv created 2022/02/28 · arxiv updated 2022/03/01 · openalex updated_date 2026/08/06
Using the density-matrix renormalization group method for the ground state and excitations of the Shastry- Sutherland spin model, we demonstrate the existence of a narrow quantum spin liquid phase between the previously known plaquette-singlet and antiferromagnetic states. Our conclusions are based on finite-size scaling of excited level crossings and order parameters. Together with previous results on candidate models for deconfined quantum criticality and spin liquid phases, our results point to a unified quantum phase diagram where the deconfined quantum-critical point separates a line of first-order transitions and a gapless spin liquid phase. The frustrated Shastry-Sutherland model is close to the critical point but slightly inside the spin liquid phase, while previously studied unfrustrated models cross the first-order line. We also argue that recent heat capacity measurements in SrCu2(BO3)2 show evidence of the proposed spin liquid at pressures between 2.6 and 3 GPa.