Study on the Quantum FK Model |
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| Authors: | XU Aiguo WANG Guangrui CHEN Shigang ZHANG Guangcai |
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| Institution: | 1. Department Physics, Beijing Normal University, Beijing 100875, China;
2. Center for Nonlinear Studies, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-28, Beijing 100088, China;
3. Instituteof Physics, The Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | In this paper, we present a variational method which is suitable for investigating the quantum fienkel-Kontorova model. For the cases of using the coherent state and the squeezed state as the trial wave functions of the ground states, the quantum Hamiltonians and the quantum maps are given. For the second case, we present the phase diagram and devil's stairs using the effective potential method, determine the critical points Kc for different l using Greene's criterion. The results given in the present paper are qualitatively consistent with those of the numerical experiments.6] |
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| Keywords: | FK model CI transition coherent state squeezed state |
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