標題: Triplet superconductivity in 3D Dirac semi-metal due to exchange interaction
作者: Rosenstein, Baruch
Shapiro, B. Ya
Li, Dingping
Shapiro, I.
電子物理學系
Department of Electrophysics
關鍵字: Dirac semi-metals;unconventional superconductivity;exchange interaction
公開日期: 21-一月-2014
摘要: Conventional phonon-electron interaction induces either triplet or one of two (degenerate) singlet pairing states in time reversal and inversion invariant 3D Dirac semi-metal. Investigation of the order parameters and energies of these states at zero temperature in a wide range of values of chemical potential mu, the effective electron-electron coupling constant. and Debye energy T-D demonstrates that when the exchange interaction is neglected the singlet always prevails, however, in significant portions of the (mu, lambda, T-D) parameter space the energy difference is very small. This means that interactions that are small, but discriminate between the spin singlet and the spin triplet, are important in order to determine the nature of the superconducting order there. The best candidate for such an interaction in the materials under consideration is the exchange (the Stoner term) characterized by constant lambda(ex). We show that at values of lambda(ex), much smaller than ones creating Stoner instability to ferromagnetism lambda(ex) similar to 1, the triplet pairing becomes energetically favored over the singlet ones. The 3D quantum critical point at mu = 0 is considered in detail. This can be realized experimentally in optically trapped cold atom systems.
URI: http://dx.doi.org/10.1088/0953-8984/27/2/025701
http://hdl.handle.net/11536/124158
ISSN: 0953-8984
DOI: 10.1088/0953-8984/27/2/025701
期刊: JOURNAL OF PHYSICS-CONDENSED MATTER
Volume: 27
顯示於類別:期刊論文


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