Higgs mode in bulk, surface and junction of multiband supercondcutors

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400346
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: Koyama Tomio 東北大学, 金属材料研究所, 教育研究支援者 (30153696)
• Co-Investigator(Renkei-kenkyūsha): MACHIDA Masahiko 国立研究開発法人日本原子力研究開発機構, 計算科学技術センター, 研究主幹 (60360434)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 多バンド超伝導体 / 集団励起モード / ヒッグスモード

Outline of Final Research Achievements

In the superconducting state we have collective excitation modes, which are the oscillation modes of the superconducting gap. In this research project we developed a theory for the collective excitation modes in superconductors with multiple conduction bands, i.e. multiband superconductors. The main results of our research are as follows. We constructed a theory based on the RPA approximation for the collective excitation modes in the time-reversal-symmetry-breaking phase of multiband superconductors and a theory for the Higgs mode in field-effect superconductors.

Free Research Field

凝縮系物理学