Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.48: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Superconductivity in Dirac semimetals — •Tatsuki Hashimoto¹, Shingo Kobayashi¹, and Masatoshi Sato² — ¹Nagoya university, Nagoya, Japan — ²Kyoto university, Kyoto, Japan

In this presentation, we would like to discuss the superconductivity in Dirac semimetals. Dirac semimetal is a material that hosts topologically protected bulk Dirac cones and surface Fermi loop. It has been revealed that the unique spin-orbit interaction in the Dirac semimetals stabilize the unconventional superconductivity. Experimentally, the zero-bias conductance peak that suggests the realization of topological superconductivity has been observed in Cd₃As₂.

We use a k · p Hamiltonian around Γ point with spin and orbital degrees of freedom to describe the Dirac semimetal. For the model, we propose six types of k-independent pair potentials, where two of them are trivial pairings and others are topological ones. By introducing a single band description of the pair potentials, it is found that the superconducting gap and d-vector have the characteristic structure in each pair potential. To see these, we calculate the electronic specific heat and spin susceptibility and confirm that we can distinguish these superconducting states experimentally. In addition to the bulk physical properties, we also calculate the surface state by using the recursive Green’s function method. It is find that either arc or flat shape Andreev bound states appear on the surface depending on the parity of mirror reflection symmetry.