WU, CQ , FUDAN UNIV,TD LEE PHYS LAB,SHANGHAI 200433,PEOPLES R CHINA.
部门归属:
FUDAN UNIV,DEPT PHYS,SHANGHAI 200433,PEOPLES R CHINA; CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; INT CTR THEORET PHYS,I-34100 TRIESTE,ITALY
英文摘要:
Within the Schwinger-boson approach for the t-J model, the single hole problem in a two-dimensional quantum antiferromagnet is studied by using the quantum Bogoliubovde Gennes formalism which treats the distortion of the spin background and quantum spin fluctuations on an equal footing. Several self-trapped localized hole states are found in the distorted spin-background as in the case of an anisotropic Heisenberg model. These localized hole states survive at finite temperatures when the antiferromagnetic order becomes short-ranged. The energy separation between the two lowest states is reduced by considering the spin-background distortion, but it remains finite.
WU, CQ,SU, ZB,YU, L. SCHWINGER-BOSON STUDIES OF THE SINGLE HOLE MOTION IN A 2D QUANTUM ANTIFERROMAGNET[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS B,1994,8(27):3843-3858.
