scholarly journals Finite temperature dynamics of vortices in the two dimensional anisotropic Heisenberg model

1999 ◽  
Vol 7 (4) ◽  
pp. 607-618 ◽  
Author(s):  
T. Kamppeter ◽  
F.G. Mertens ◽  
A. Sánchez ◽  
A.R. Bishop ◽  
F. Domínguez-Adame ◽  
...  
Keyword(s):  
Finite Temperature ◽  
Heisenberg Model ◽  
Two Dimensional ◽  
Anisotropic Heisenberg Model ◽  
Temperature Dynamics

scholarly journals SCHWINGER-BOSON STUDIES OF THE SINGLE HOLE MOTION IN A 2D QUANTUM ANTIFERROMAGNET

1994 ◽  
Vol 08 (27) ◽  
pp. 3843-3858
Author(s):  
C.Q. WU ◽  
Z.B. SU ◽  
L. YU
Keyword(s):  
Heisenberg Model ◽  
Quantum Spin ◽  
Spin Fluctuations ◽  
Energy Separation ◽  
Antiferromagnetic Order ◽  
Two Dimensional ◽  
Equal Footing ◽  
Anisotropic Heisenberg Model ◽  
Single Hole ◽  
Quantum Antiferromagnet

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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