Spin transport in polaronic and superfluid Fermi gases

Spin transport in polaronic and superfluid Fermi gases
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极化子和超流费米气体中的自旋输运

DOI:
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
M. Zwierlein
M. Zwierlein
中科院分区:
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文献类型:
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作者:
A. Sommer;M. Ku;M. Zwierlein

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我们提出了费什巴赫共振下两种自旋态混合物中费米子 6Li 超冷气体中自旋输运的测量。特别是,我们研究了自旋偶极子模式,其中两个自旋分量抵抗谐波恢复力而彼此位移。我们制备了具有自旋偶极子激发的高度不平衡或极化自旋混合物,并且观察到自旋偶极子模式的强的、单位性有限的阻尼。在自旋不平衡程度较小的气体中,低于超流性泡利极限,即使存在超流核,我们也观察到强阻尼自旋流。这表明超流体和极化法向自旋之间存在强烈的相互摩擦,可能涉及超流体-法向界面处的安德烈夫反射。
We present measurements of spin transport in ultracold gases of fermionic 6Li in a mixture of two spin states at a Feshbach resonance. In particular, we study the spin-dipole mode, where the two spin components are displaced from each other against a harmonic restoring force. We prepare a highly imbalanced, or polaronic, spin mixture with a spin-dipole excitation and we observe strong, unitarity-limited damping of the spin-dipole mode. In gases with small spin imbalance, below the Pauli limit for superfluidity, we observe strongly damped spin flow even in the presence of a superfluid core. This indicates strong mutual friction between superfluid and polarized normal spins, possibly involving Andreev reflection at the superfluid–normal interface.
DOI: 10.1103/physreva.78.023633
发表时间: 2008-03
期刊: Physical Review A
影响因子: 2.9
作者:
A. Recati;Carlos Lobo;S. Stringari
通讯作者: A. Recati;Carlos Lobo;S. Stringari