A Novel Mechanism to Generate FFLO States in Holographic Superconductors
arXiv:1210.1541 · doi:10.1016/j.physletb.2013.02.018
Abstract
We discuss a novel mechanism to set up a gravity dual of FFLO states in strongly coupled superconductors. The gravitational theory utilizes two U(1) gauge fields and a scalar field coupled to a charged AdS black hole. The first gauge field couples with the scalar sourcing a charge condensate below a critical temperature, and the second gauge field provides a coupling to spin in the boundary theory. The scalar is neutral under the second gauge field. By turning on an interaction between the Einstein tensor and the scalar, it is shown that, in the low temperature limit, an inhomogeneous solution possesses a higher critical temperature than the homogeneous case, giving rise to FFLO states.
v2: 7 pages, 5 figures, improved discussion on critical temperature, to appear in PLB. arXiv admin note: text overlap with arXiv:1208.4582
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