由量子涨落诱导的单轴和双轴自旋向列相。
Uniaxial and biaxial spin nematic phases induced by quantum fluctuations.
作者信息
Song Jun Liang, Semenoff Gordon W, Zhou Fei
机构信息
Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T1Z1.
出版信息
Phys Rev Lett. 2007 Apr 20;98(16):160408. doi: 10.1103/PhysRevLett.98.160408.
It is shown that zero point quantum fluctuations completely lift the accidental continuous degeneracy that is found in mean field analysis of quantum spin nematic phases of hyperfine spin-2 cold atoms. The result is two distinct ground states which have higher symmetries: a uniaxial spin nematic and a biaxial spin nematic with dihedral symmetry Dih4. There is a novel first-order quantum phase transition between the two phases as atomic scattering lengths are varied. We find that the ground state of 87Rb atoms should be a uniaxial spin nematic. We note that the energy barrier between the phases could be observable in dynamical experiments.
结果表明，零点量子涨落完全消除了超精细自旋为2的冷原子量子自旋向列相平均场分析中出现的偶然连续简并。结果是出现了两个具有更高对称性的不同基态：一个单轴自旋向列相和一个具有二面体对称性Dih4的双轴自旋向列相。随着原子散射长度的变化，这两个相之间存在一种新型的一级量子相变。我们发现87Rb原子的基态应该是一个单轴自旋向列相。我们注意到，在动力学实验中可以观察到这两个相之间的能垒。
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