Unconventional magnetism via optical pumping of interacting spin systems.
Unconventional magnetism via optical pumping of interacting spin systems.
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DOI：
10.1103/physrevlett.110.257204
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
Tony E. Lee;S. Gopalakrishnan;M. Lukin
中科院分区：
文献类型：
--
作者：
Tony E. Lee;S. Gopalakrishnan;M. Lukin
我们考虑有效自旋的强相互作用系统，受到与光泵浦相关的耗散自旋翻转过程的影响。我们预测在该系统的稳态中存在新的磁相，这是由于相干过程和耗散过程之间的竞争而出现的。具体来说，对于强各向异性的自旋-自旋相互作用，我们发现铁磁、反铁磁、自旋密度波和交错 XY 稳态，它们被在 Lifshitz 点相遇的非平衡相变分开。这些跃迁伴随着量子相关性，导致自旋挤压。讨论了超冷原子和捕获离子的实验实现。
We consider strongly interacting systems of effective spins, subject to dissipative spin-flip processes associated with optical pumping. We predict the existence of novel magnetic phases in the steady state of this system, which emerge due to the competition between coherent and dissipative processes. Specifically, for strongly anisotropic spin-spin interactions, we find ferromagnetic, antiferromagnetic, spin-density-wave, and staggered-XY steady states, which are separated by nonequilibrium phase transitions meeting at a Lifshitz point. These transitions are accompanied by quantum correlations, resulting in spin squeezing. Experimental implementations in ultracold atoms and trapped ions are discussed.