TIAN, GS , BEIJING UNIV,DEPT PHYS,BEIJING 100871,PEOPLES R CHINA.
部门归属:
ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要:
In this paper, we shall study the effect of an external magnetic field on the magnetic long-range orders (MLRO) in the global ground states of the quantum XY model and the isotropic Heisenberg model on the simple cubic lattices. We shall rigorously prove that, while an external magnetic field (staggered in the antiferromagnetic case) which favours MLRO in a specific spin direction, say x-direction, is turned on, it completely suppresses the MLRO in the perpendicular spin directions in the global ground states of these models.
TIAN, GS. THE EFFECT OF AN EXTERNAL MAGNETIC-FIELD ON THE MLRO IN THE GLOBAL GROUND-STATES OF SOME ANTIFERROMAGNETIC MODELS[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL,1994,27(12):4043-4048.
