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arXiv 1111.2375cond-mat.quant-gas
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一维简谐势阱中自旋1玻色子的量子临界性

Quantum criticality of spin-1 bosons in a 1D harmonic trap

C. C. N. Kuhn, X. W. Guan, A. Foerster, M. T. Batchelor

摘要:

研究了一维简谐势阱中具有强排斥密度-密度和反铁磁自旋交换相互作用的自旋1玻色子的普遍热力学和量子临界性。从状态方程,我们发现,一个部分极化的核心是由两个翅膀组成的自旋单态对或完全自旋对齐的Tonks-Girardeau气体取决于极化。我们描述了密度分布的标度行为如何揭示量子临界性的普遍性质,并绘制出量子相图。我们进一步证明了在量子临界时,动力学临界指数$z = 2$和关联长度指数$ν=1/2$。这揭示了与自旋为1/2的有吸引力的费米气体物理学的微妙相似之处。

英文摘要:

We investigate universal thermodynamics and quantum criticality of spin-1 bosons with strongly repulsive density-density and antiferromagnetic spin-exchange interactions in a one-dimensional harmonic trap. From the equation of state, we find that a partially-polarized core is surrounded by two wings composed of either spin-singlet pairs or a fully spin-aligned Tonks-Girardeau gas depending on the polarization. We describe how the scaling behaviour of density profiles can reveal the universal nature of quantum criticality and map out the quantum phase diagram. We further show that at quantum criticality the dynamical critical exponent $z = 2$ and correlation length exponent $ν=1/2$. This reveals a subtle resemblance to the physics of the spin-1/2 attractive Fermi gas.

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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