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arXiv 0901.2323cond-mat.supr-concond-mat.str-el
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奇频超导体的波函数

Wave function for odd frequency superconductors

Hari P. Dahal, E. Abrahams, D. Mozyrsky, Y. Tanaka, A. V. Balatsky

摘要:

我们重新讨论了奇频超导体的性质问题,这一问题最早是由Berezinskii在1974年提出的。\cite{berezinskii1974}我们从奇频超导体的序参量可以看作是奇时间配对算符的时间导数的概念开始。它导致了复合玻色子凝聚的概念。为了阐明奇频超导体中对称破缺态的性质,我们考虑了一种波函数,它能恰当地捕获奇频超导体中复合电荷$2e$玻色子的相干凝聚.我们考虑描述等时复合玻色子凝聚的哈密顿量,如早先在Phys.Rev.B $\textbf{52}$,1271(1995)中提出的。我们提出了一个类似BCS的波函数,它描述了一个由自旋0的库珀对和自旋1的磁振子激发组成的复合凝聚体。导出了准粒子色散、序参量的自洽方程和态密度。我们表明,相干波函数的方法恢复所有已知的propersities的奇频超导体:准粒子激发是无隙和超导过渡需要一个临界耦合。

英文摘要:

We revisit the question of nature of odd-frequency superconductors, first proposed by Berezinskii in 1974. \cite{berezinskii1974} We start with the notion that order parameter of odd-frequency superconductors can be thought of as a time derivative of the odd-time pairing operator. It leads to the notion of the composite boson condensate.\cite{abrahams1995} To elucidate the nature of broken symmetry state in odd-frequency superconductors, we consider a wave function that properly captures the coherent condensate of composite charge $2e$ bosons in an odd-frequency superconductor. We consider the Hamiltonian which describes the equal-time composite boson condensation as proposed earlier in Phys. Rev. B $\textbf{52}$, 1271 (1995). We propose a BCS-like wave function that describes a composite condensate comprised of a spin-0 Cooper pair and a spin-1 magnon excitation. We derive the quasiparticle dispersion, the self-consistent equation for the order parameter and the density of states. We show that the coherent wave function approach recovers all the known proposerties of odd-frequency superconductors: the quasi-particle excitations are gapless and the superconducting transition requires a critical coupling.

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