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arXiv 0812.0528cond-mat.stat-mechnucl-th
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泛函重整化的Efimov效应

Efimov effect from functional renormalization

S. Moroz, S. Floerchinger, R. Schmidt, C. Wetterich

摘要:

本文将场论泛函重整化群方法应用于非相对论原子在费什巴赫共振附近的少体(真空)物理。考虑三种系统:具有U(1)对称性的单分量玻色子、具有U(1)\times SU(2)对称性的二分量费米子和具有U(1)\times SU(3)对称性的三分量费米子。我们主要研究无限散射长度下的标度不变么正性极限。两体扇区的精确解与所有考虑系统的酉不动点行为一致。然而,在s波扇区的数值三体解在U(1)玻色子和SU(3)费米子的情况下发展了极限环标度。单分量玻色子和三分量费米子的Efimov参数约为s=1.006,与Efimov的结果一致。

英文摘要:

We apply a field-theoretic functional renormalization group technique to the few-body (vacuum) physics of non-relativistic atoms near a Feshbach resonance. Three systems are considered: one-component bosons with U(1) symmetry, two-component fermions with U(1)\times SU(2) symmetry and three-component fermions with U(1) \times SU(3) symmetry. We focus on the scale invariant unitarity limit for infinite scattering length. The exact solution for the two-body sector is consistent with the unitary fixed point behavior for all considered systems. Nevertheless, the numerical three-body solution in the s-wave sector develops a limit cycle scaling in case of U(1) bosons and SU(3) fermions. The Efimov parameter for the one-component bosons and the three-component fermions is found to be approximately s=1.006, consistent with the result of Efimov.

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