Studies on Nematic Liquid Crystal Using Spin Wave Theory |
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Authors: | LIU Jian-Jun LIU Xiao-Jing SHEN Man YANG Guo-Chen |
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Institution: | 1. College of Physics, Hebei Normal University, Shijiazhuang 050016, China ;2. Institute of Physics, Hebei University of Technology, Tianjin 300130, China |
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Abstract: | A spin wave theory is proposed to study nematic liquid crystals.
Since the orientation of the molecular long axis and the angular
momentum of the molecule rotating around its long axis have the same
direction, operators can be introduced to research the nematic liquid
crystal. By transforming the intermolecular interaction potential, the
Hamiltonian of the system has the same form as that of the ferromagnetic
substance. The relation of the order parameters to the reduced
temperature can be obtained. It is in good agreement with the experimental
results in the low temperature region. In the high temperature region
close to the transition point, by using the Hamiltonian, the
transition point can be obtained, which is near to the Maier--Saupe's
result. |
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Keywords: | nematic liquid crystals spin wave order parameters |
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