Analysis of collective excitation for multi band superconductor: Frustrated spin model approach

作者：Kobayashi K^*; Ota Y; Machinda M

来源：Physica C-Superconductivity and Its Applications, 2013, 494: 13-16.

DOI：10.1016/j.physc.2013.04.057

• Multi-band superconductor
• Collective mode
• Frustrated spin model

We study properties of multi-band superconductors, focusing on their ground states and collective excitations. Multi-band tight-binding Hamiltonian with repulsive pair-hopping interaction is mapped into a frustrated spin-Hamiltonian. This frustration leads to exotic features in a multi-band superconductor.
Applying the mean-field theory to the three-and four-band systems, we systematically examine the superconducting-phase structure between multiple order parameters, and the associated collective modes.

• 出版日期2013-11