The Critical Properties of a Modulated Quantum sine—Gordon Model |
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作者单位: | Department of Physics, Tongji University. Shanghai 200092. China
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摘 要: | A new procedure of trial variational wave functional is proposed for invostigating the mass reuormalizationand the local structure of the ground state of a one-dimensional quantum sine-Gorrdonm model with linear spatial modu-lation, whose ground state differs from that without modulation. Thc phase diagram obtained in parameters (αA 2,β2)plane shows that the vertical part of the boundary between soliton lattice phase and iucommensurate (IC) phase withvanishing gap sticks at β2 = 4, the IC phase can only appear forβ2 > 47r and thc IC phase regime is enlarged withincreasing spatial modulation in the case of definite parameter αA-2. The transition is of the continuous type on thevertical part of the boundary, while it is of the first order on the boundary forβ2 > 47r.
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关 键 词: | 量子力学 量子Sime-Gordon模型 临界性质 |
The Critical Properties of a Modulated Quantum sine-Gordon Model |
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Authors: | WANG ZhiGuo ZHANG Yumei |
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Keywords: | sine-Gordon model spatial modulation soliton lattice incommensurate phase phase diagram |
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