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arXiv 2302.13685cond-mat.quant-gascond-mat.stat-mechhep-latquant-ph
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一维全同费米子的三体散射超体积

The three-body scattering hypervolume of identical fermions in one dimension

Zipeng Wang, Shina Tan

AI总结:

本文研究一维自旋极化费米子的三体零能量碰撞,通过渐近展开定义散射超体积 $D_F$,给出弱相互作用下的近似公式,并对多种势进行数值计算,进而分析其对费米气体能量、压强及三体复合率的影响。

摘要:

我们研究一维中具有短程相互作用的三个全同自旋极化费米子的零能量碰撞。我们推导出当三个费米子彼此远离或一对费米子与第三个费米子远离时三体波函数的渐近展开,三体散射超体积 $D_F$ 出现在这些展开的系数中。如果两体相互作用是吸引性的并支持两体束缚态,则 $D_F$ 获得一个负的虚部,该虚部与描述生成的束缚对和剩余自由费米子离开的出射波振幅相关。对于弱相互作用势,我们利用玻恩展开推导出超体积的近似公式。对于方势垒、方势阱势和高斯势,我们求解三体薛定谔方程以数值计算 $D_F$。我们还计算了由于非零 $D_F$ 引起的自旋极化一维费米气体的能量移动和压强移动,以及一维中的三体复合率。

英文摘要:

We study the zero-energy collision of three identical spin-polarized fermions with short-range interactions in one dimension. We derive the asymptotic expansions of the three-body wave function when the three fermions are far apart or one pair and the third fermion are far apart, and the three-body scattering hypervolume $D_F$ appears in the coefficients of such expansions. If the two-body interaction is attractive and supports two-body bound states, $D_F$ acquires a negative imaginary part related to the amplitudes of the outgoing waves describing the departure of the resultant bound pair and the remaining free fermion. For weak interaction potentials, we derive an approximate formula of the hypervolume by using the Born expansion. For the square-barrier and the square-well potentials and the Gaussian potential, we solve the three-body Schrödinger equation to compute $D_F$ numerically. We also calculate the shifts of energy and of pressure of spin-polarized one-dimensional Fermi gases due to a nonzero $D_F$ and the three-body recombination rate in one dimension.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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