Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca_(2)CuO_(2)Cl_(2)  

作　　者：Cheng Hu Jian-Fa Zhao Ying Ding Jing Liu Qiang Gao Lin Zhao Guo-Oong Liu Li Yu Chang-Qing Jin Chuang-Tian Chen Zu-Yan Xu Xing-Jiang Zhou 胡成;赵建发;丁颖;刘静;高强;赵林;刘国东;俞理;靳常青;陈创天;许祖彦;周兴江(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Collaborative Innovation Center of Quantum Matter;Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190 [2]University of Chinese Academy of Sciences,Beijing 100049 [3]Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 10019 [4]Collaborative Innovation Center of Quantum Matter,Beijing 100871

出　　处：《Chinese Physics Letters》2018年第6期84-89,共6页中国物理快报(英文版)

基　　金：Supported by the National Key Research and Development Program of China(2016YFA0300300);the National Natural Science Foundation of China(11334010 and 11534007);the National Basic Research Program of China(2015CB921000);the Strategic Priority Research Program(B)of Chinese Academy of Sciences(XDB07020300)

摘　　要：The parent compounds of the high-temperature cuprate superconductors are Mott insulators.It has been generally agreed that understanding the physics of the doped Mott insulators is essential to understanding the mechanism of high temperature superconductivity.A natural starting point is to elucidate the basic electronic structure of the parent compound.Here we report comprehensive high resolution angle-resolved photoemission measurements on Ca_2CuO_2Cl_2,a Mott insulator and a prototypical parent compound of the cuprates.Multiple underl.ying Fermi surface sheets are revealed for the first time.The high energy waterfall-like band dispersions exhibit different behaviors near the nodal and antinodal regions.Two distinct energy scales are identified:a d-wave-like low energy peak dispersion and a nearly isotropic lower Hubbard band gap.These observations provide new information of the electronic structure of the cuprate parent compound,which is important for understanding the anomalous physical properties and superconductivity mechanism of the high temperature cuprate superconductors.The parent compounds of the high-temperature cuprate superconductors are Mott insulators.It has been generally agreed that understanding the physics of the doped Mott insulators is essential to understanding the mechanism of high temperature superconductivity.A natural starting point is to elucidate the basic electronic structure of the parent compound.Here we report comprehensive high resolution angle-resolved photoemission measurements on Ca_2CuO_2Cl_2,a Mott insulator and a prototypical parent compound of the cuprates.Multiple underl.ying Fermi surface sheets are revealed for the first time.The high energy waterfall-like band dispersions exhibit different behaviors near the nodal and antinodal regions.Two distinct energy scales are identified:a d-wave-like low energy peak dispersion and a nearly isotropic lower Hubbard band gap.These observations provide new information of the electronic structure of the cuprate parent compound,which is important for understanding the anomalous physical properties and superconductivity mechanism of the high temperature cuprate superconductors.

分 类 号：O4[理学—物理]