三波段超导体中的集体激发

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Condensed Matter Physics Pub Date : 2021-11-24 DOI:10.5488/CMP.26.23702
K. V. Grigorishin
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引用次数: 0

摘要

我们研究了三波段超导体的平衡态、磁响应和内部自由度(希格斯模式和戈德斯通模式)的正常振荡,并考虑了拉格朗日中的内部接近效应和“阻力”效应(梯度间相互作用)。戈德斯通模式和希格斯模式都被分成三个分支:共模振荡和两个反相振荡模式,它们类似于两波段超导体中的莱格特模式。证明了第二和第三分支是非物理的,它们可以通过拉格朗日中“拖拽”项处的特殊系数来去除。因此,三波段超导体的特点是只有单一相干长度。得到了共模希格斯振荡谱。磁穿透深度由每个带中超导电子的密度决定,尽管阻力项使载流子质量重新规范化。
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Collective excitations in three-band superconductors
We investigate equilibrium states, magnetic response and the normal oscillations of internal degrees of freedom (Higgs modes and Goldstone modes) of three-band superconductors accounting the terms of both internal proximity effect and the ``drag'' effect (intergradient interaction) in the Lagrangian. Both the Goldstone mode and the Higgs mode are split into three branches each: common mode oscillations and two modes of anti-phase oscillations, which are analogous to the Leggett mode in two-band superconductors. It is demonstrated that the second and third branches are nonphysical, and they can be removed by special choice of coefficients at the ``drag'' terms in Lagrangian. As a result, three-band superconductors are characterized by only single coherence length. Spectrum of the common mode Higgs oscillations has been obtained. The magnetic penetration depth is determined with densities of superconducting electrons in each band, although the drag terms renormalize the carrier masses.
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来源期刊
Condensed Matter Physics
Condensed Matter Physics 物理-物理:凝聚态物理
CiteScore
1.10
自引率
16.70%
发文量
17
审稿时长
1 months
期刊介绍: Condensed Matter Physics contains original and review articles in the field of statistical mechanics and thermodynamics of equilibrium and nonequilibrium processes, relativistic mechanics of interacting particle systems.The main attention is paid to physics of solid, liquid and amorphous systems, phase equilibria and phase transitions, thermal, structural, electric, magnetic and optical properties of condensed matter. Condensed Matter Physics is published quarterly.
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