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A Condensation of Interacting Bosons in Two Dimensional Space

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arxiv hep-th/9905120 v1 pith:5J6MMWON submitted 1999-05-17 hep-th cond-mat.stat-mechphysics.optics

classification hep-thcond-mat.stat-mechphysics.optics
keywords bosonstheorydivergenceenergygroundinteractionlimitnumber
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We develop a theory of non-relativistic bosons in two spatial dimensions with a weak short range attractive interaction. In the limit as the range of the interaction becomes small, there is an ultra-violet divergence in the problem. We devise a scheme to remove this divergence and produce a completely finite formulation of the theory. This involves reformulating the dynamics in terms of a new operator whose eigenvalues give the {\it logarithm} of the energy levels. Then, a mean field theory is developed which allows us to describe the limit of a large number of bosons. The ground state is a new kind of condensate (soliton) of bosons that breaks translation invariance spontaneously. The ground state energy is negative and its magnitude grows {\it exponentially} with the number of particles, rather than like a power law as for conventional many body systems.

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Cited by 4 Pith papers

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