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作 者:Li-Han Chen Da Wang Yi Zhou Qiang-Hua Wang 陈历寒;王达;周毅;王强华(National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190)
机构地区:[1]National Laboratory of Solid State Microstructures and School of Physics,Nanjing University,Nanjing 210093 [2]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093 [3]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190 [4]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190
出 处:《Chinese Physics Letters》2020年第1期83-87,共5页中国物理快报(英文版)
基 金:the National Key Research and Development Program of China under Grant Nos.2016YFA0300401 and 2016YFA0300202;the National Natural Science Foundation of China under Grant Nos.11574134,11874205 and 11774306;the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB28000000).
摘 要:We investigate in underdoped cuprates possible coexistence of the superconducting order at zero momentum and pair density wave(PDW)at momentum Q=(Л,Л)in the presence of a Neel order.By symmetry,the d-wave uniform singlet pairing dS0 can coexist with the d-wave triplet PDW dTq,and the p-wave singlet PDW pSq can coexist with the p-wave uniform triplet pT0.At half filling,we find that the novel pSq+pT0 state is energetically more favorable than the dS0+dTQ state.At finite doping,however,the dS0+dTq state is more favorable.In both types of states,the variational triplet parameters cITq and pT0 are of secondary significance.Our results point to a fully symmetric Z2 quantum spin liquid with spinon Fermi surface in proximity to the Neel order at zero doping,which may not be adiabatically connected to the d-wave singlet superconductivity at finite doping with intertwining d-wave triplet PDW fluctuations and spin moment fluctuations.The results are obtained by variational quantum Monte Carlo simulations.
关 键 词:DOPING SINGLET VARIATIONAL
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