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arXiv 1304.2102cond-mat.supr-con
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BiS $_{2}-$基超导体中的配对对称性

Pairing symmetry in BiS$_{2}-$based superconductors

Yi Gao

摘要:

采用最小双轨道模型,分别考虑了原位和最近邻轨道内吸引力$V_{0}$和$V_{1}$,研究了BiS $_{2}-$基超导体可能的配对对称性.利用平均场近似,通过求解自洽方程,得到了对对称的相图。结果表明,该模型允许三种可能的配对对称性,根据$V_{0}$和$V_{1}$的值:同位素$s-$波配对[ $Δ_{\mathbf{k}}=Δ_{s}$ ],各向异性$s-$波配对[ $Δ_{\mathbf{k}}=Δ_{s}+\frac{Δ_{xs}}{2}(\cos k_{x}+\cos k_{y})$ ]和$d-$波配对[ $Δ_{\mathbf{k}}=\frac{Δ_{d}}{2}(\cos k_{x}-\cos k_{y})$ ]。此外,这些配对对称性的态密度表现出不同的行为,可以用来区分它们。

英文摘要:

The possible pairing symmetries for BiS$_{2}-$based superconductors is investigated by using a minimal two-orbital model with onsite and nearest-neighbor intraorbital attractions $V_{0}$ and $V_{1}$, respectively. By using the mean-field approximation and solving the self-consistent equations, the phase diagram of the pairing symmetry is obtained. It is shown that the model allows three possible pairing symmetries, depending on the values of $V_{0}$ and $V_{1}$: the isotopic $s-$wave pairing [$Δ_{\mathbf{k}}=Δ_{s}$], the anisotropic $s-$wave pairing [$Δ_{\mathbf{k}}=Δ_{s}+\frac{Δ_{xs}}{2}(\cos k_{x}+\cos k_{y})$] and the $d-$wave pairing [$Δ_{\mathbf{k}}=\frac{Δ_{d}}{2}(\cos k_{x}-\cos k_{y})$]. Furthermore the density of states for these pairing symmetries exhibit different behaviors which can be used to distinguish them.

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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