Flow equation solution for the weak to strong coupling crossover in the sine-Gordon model
Jul, 199910 pages
Published in:
- Phys.Rev.Lett. 83 (1999) 4914-4917
e-Print:
- cond-mat/9908048 [cond-mat]
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Abstract: (arXiv)
A continuous sequence of infinitesimal unitary transformations, combined with an operator product expansion for vertex operators, is used to diagonalize the quantum sine-Gordon model for 2 pi < beta^2 < infinity. The leading order of this approximation already gives very accurate results for the single-particle gap in the strong-coupling phase. This approach can be understood as an extension of perturbative scaling theory since it links weak to strong-coupling behavior in a systematic expansion. The approach should also be useful for other strong-coupling problems that can be formulated in terms of vertex operators.- sine-Gordon model
- dimension: 2
- operator product expansion
- operator: vertex
- scaling
- soliton: mass
- strong coupling
- weak coupling
- transformation: unitarity
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