Dynamics of topological superconductor and superfluid

2014 Fiscal Year Final Research Report

• Project/Area Number: 25887018
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: ARAHATA Emiko 首都大学東京, 理工学研究科, 准教授 (30706411)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: 超伝導 / ホール効果 / スピン流

Outline of Final Research Achievements

We study dynamics of a two-dimensional s-wave superconductor in the presence of a moving single vortex on the basis of the quasi classical theory. We showed asymmetry in local density of state and shift of the main peak have been observed in experiment.
We also study theoretically a model for twin boundaries in superconductors with Rashba spin-orbit coupling, which can be relevant to three-dimensional noncentrosymmetric tetragonal crystals.
Within the framework of a Ginzburg-Landau theory, we show that a time-reversal symmetry breaking superconducting state nucleates near the twin boundary if singlet and triplet pairing amplitudes are of comparable magnitude. As a consequence, the tendency towards ferromagnetic order is locally increased along with the emergence of spontaneous supercurrents parallel to the twin boundary. Spin currents, which are present in the form of Andreev bound states, are found enhanced in the time-reversal broken phases.

Free Research Field

量子エレクトロニクス