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arXiv 1401.0965cond-mat.quant-gas
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具有共振p波相互作用的二维三个全同费米子

Three Identical Fermions with Resonant p-wave Interactions in Two Dimensions

Chao Gao, Zhenhua Yu

摘要:

通过对具有共振$p$ -波相互作用的三维费米子的场论计算,预言了一种新的结合能标度为$\ln|E_n|\sim-e^{3nπ/4}$的“超Efimov”态[Phys.Rev.Lett. \textbf{110},235301(2013)]。然而,这些“超Efimov”状态的普遍性尚未被独立证明。在这封信中,我们通过超球形式研究了三费米子系统。在绝热近似下,我们发现在$p$波共振下,角动量态$\ell=\pm1$的低能物理性质主要依赖于由粒子间势细节决定的涌现无量纲参数$Y$的值.只有当$Y$恰好为零时,预测的“超Efimov”状态才存在。如果是$Y>0$,则束缚态的标度变为$\ln|E_n|\sim-(nπ)^2/2Y$,而如果是$Y<0$,则没有浅束缚态。

英文摘要:

A new kind of "super-Efimov" states of binding energies scaling as $\ln|E_n|\sim-e^{3nπ/4}$ were predicted by a field theory calculation for three fermions with resonant $p$-wave interactions in two dimensions [Phys. Rev. Lett. \textbf{110}, 235301 (2013)]. However, the universality of these "super-Efimov" states has not been proved independently. In this Letter, we study the three fermion system through the hyperspherical formalism. Within the adiabatic approximation, we find that at $p$-wave resonances, the low energy physics of states of angular momentum $\ell=\pm1$ crucially depends on the value of an emergent dimensionless parameter $Y$ determined by the detail of the inter-particle potential. Only if $Y$ is exactly zero, the predicted "super-Efimov" states exist. If $Y>0$, the scaling of the bound states changes to $\ln|E_n|\sim-(nπ)^2/2Y$, while there are no shallow bound states if $Y<0$.

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