On the Phase Transition and Critical Behaviour in the Two-Dimensional Anisotropic Heisenberg Model

1976 ◽  
Vol 40 (3) ◽  
pp. 657-665 ◽  
Author(s):  
R. Shanker ◽  
R. A. Singh
2020 ◽  
Vol 102 (11) ◽  
Author(s):  
Jiangfan Wang ◽  
Yung-Yeh Chang ◽  
Chung-Yu Mou ◽  
Stefan Kirchner ◽  
Chung-Hou Chung

1994 ◽  
Vol 08 (27) ◽  
pp. 3843-3858
Author(s):  
C.Q. WU ◽  
Z.B. SU ◽  
L. YU

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.


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