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HL: Fachverband Halbleiterphysik

HL 8: 2D materials (joint session HL/DS)

HL 8.2: Vortrag

Montag, 12. März 2018, 15:15–15:30, EW 201

Superconductivity and electron-phonon properties of intrinsic and doped antimonene — •Andrei Lugovskoi, Mikhail Katsnelson, and Alexander Rudenko — Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands

Antimonene is a recently discovered elemental 2D phase of Sb with buckled honeycomb structures. The material was successfully obtained experimentally, and posses interesting set of properties. It was shown to have high stability on base of both experimental observations and ab initio modeling, and is also predicted to have interesting optical properties and strain tunable band gap. At the same time, superconductivity in doped phosphorene and graphene was recently observed experimentally, which opens new opportunities for the application of 2D materials.

We present the ab initio calculations of electron-phonon coupling properties and critical superconducting temperature in both n- and p-doped antimonene at experimentally achievable carrier concentrations. The effects of small strains and bias voltage on the critical temperature are also considered. Required quantities are obtained by using density functional theory implementation of electron-phonon Wannier-Fourier interpolation in EPW and QE codes. Critical temperature at various carrier densities is estimated using McMillan-Allen-Dynes equation.

The work is a part of the research program "Two-dimensional semiconductor crystals" (prj. 14TWOD01), which is partly financed by the Netherlands Organization for Scientific Research (NWO).