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arXiv 1407.3883cond-mat.supr-con
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具有塞曼场的Rashba系统正常相和超导相的霍尔电导率

Hall conductivity in the normal and superconducting phases of the Rashba system with Zeeman field

Suk Bum Chung, Rahul Roy

摘要:

本文研究了垂直塞曼场中Rashba金属的普通相和拓扑超导相的本征霍尔电导率。在这个系统中,正常的金属打破时间反演对称性,而超导序参量没有,在单层SrCl_2O_3(Sr $_2$ RuO $_4$)的霍尔电导率已被广泛研究的预测的手征p波超导状态。我们研究了带内和带间配对的影响,发现当存在带间配对时,本征霍尔电导率发生了质的较大变化,其幅度的变化在配对间隙中呈线性。我们认为,带间配对导致拓扑相相比,拓扑平凡相的能量成本更高,因此,在这些系统中的超导性的固有霍尔电导率的定性行为可以提供重要的线索,在超导相配对的性质,甚至一些提示,它是否是拓扑或不。

英文摘要:

We study the intrinsic Hall conductivity of the ordinary and topological superconducting phases of a Rashba metal in a perpendicular Zeeman field. In this system the normal metal breaks time reversal symmetry while the superconducting order parameter does not, in contrast to the chiral p-wave superconducting state predicted in the monolayer strontium ruthenate (Sr$_2$RuO$_4$) whose Hall conductivity has been studied extensively. We study the effects of intra-band and inter-band pairing and find there is qualitatively larger change in the intrinsic Hall conductivity when there is inter-band pairing, with the change in magnitude linear in the pairing gap. We argue that inter-band pairing leads in general to higher energy costs for the topological phase compared to the topologically trivial phase and thus that the qualitative behavior of the intrinsic Hall conductivity with superconductivity in these systems could provide important clues about the nature of pairing in the superconducting phase and even some hints of whether it is topological or not.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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