非平衡全息超导体与自旋电子学
Unbalanced Holographic Superconductors and Spintronics
摘要：
本文提出了一个2+1维非平衡费米混合体中强耦合s波超导的最小全息模型。在带电渐近AdS_4黑洞中，带电标量场的非平凡分布驱动U（1）_A“荷”对称性破缺.化学势不平衡是通过打开U（1）_B“自旋”场的时间分量来实现的，在U（1）_B“自旋”场下，标量场是不带电的。我们研究的相图模型和评论LOFF样的非均匀超导相的最终（非）发生。此外，我们研究了“电荷”和“自旋”的运输，实现了莫特的两个电流模型，提供了现代自旋电子学的理论基础的全息实现（及其推广到超导装置）。最后，我们评论可能的字符串或M-理论嵌入我们的模型及其高维推广，一致的卡鲁扎-克莱因截断和膜反膜设置。
英文摘要：
We present a minimal holographic model for s-wave superconductivity with unbalanced Fermi mixtures, in 2+1 dimensions at strong coupling. The breaking of a U(1)_A "charge" symmetry is driven by a non-trivial profile for a charged scalar field in a charged asymptotically AdS_4 black hole. The chemical potential imbalance is implemented by turning on the temporal component of a U(1)_B "spin" field under which the scalar field is uncharged. We study the phase diagram of the model and comment on the eventual (non) occurrence of LOFF-like inhomogeneous superconducting phases. Moreover, we study "charge" and "spin" transport, implementing a holographic realization (and a generalization thereof to superconducting setups) of Mott's two-current model which provides the theoretical basis of modern spintronics. Finally we comment on possible string or M-theory embeddings of our model and its higher dimensional generalizations, within consistent Kaluza-Klein truncations and brane-anti brane setups.
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