Consistent Scaling Exponents at the Deconfined Quantum-Critical Point  

作　　者：Anders W.Sandvik Bowen Zhao Anders W.Sandvik;赵博文(Department of Physics,Boston University,Boston,Massachusetts 02215,USA;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]Department of Physics,Boston University,Boston,Massachusetts 02215,USA [2]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190

出　　处：《Chinese Physics Letters》2020年第5期93-97,共5页中国物理快报（英文版）

基　　金：National Science Foundation(USA)under Grant No.DMR-1710170;Simons Foundation under a Simons Investigator Award。

摘　　要：We report a quantum Monte Carlo study of the phase transition between antiferromagnetic and valence-bond solid ground states in the square-lattice S=1/2 J-Q model.The critical correlation function of the Q terms gives a scaling dimension corresponding to the value v=0.455±0.002 of the correlation-length exponent.This value agrees with previous(less precise)results from conventional methods,e.g.,finite-size scaling of the nearcritical order parameters.We also study the Q-derivatives of the Binder cumulants of the order parameters for L2 lattices with L up to 448.The slope grows as L1/v with a value of v consistent with the scaling dimension of the Q term.There are no indications of runaway flow to a first-order phase transition.The mutually consistent estimates of v provide compelling support for a continuous deconfined quantum-critical point.

关 键 词：transition. CONFINED SCALING 

分 类 号：O469[理学—凝聚态物理]