Topological superconducting pairing in a Chiral Kramers Weyl semimetal

ORAL

Abstract

Topological superconductors present an ideal platform for exploring nontrivial superconductivity and realizing Majorana boundary modes in materials. However, finding a single-phase topological material with nontrivial superconducting states is a challenge. Here, we predict nontrivial superconductivity in the pristine chiral metal RhGe with a transition temperature of 5.8 K. Chiral symmetries in RhGe enforce multifold Weyl fermions at high-symmetry momentum points and spin-polarized Fermi arc states that span the whole surface Brillouin zone. These bulk and surface chiral states support multiple type-II van Hove singularities that enhance superconductivity in RhGe. Our detailed analysis of superconducting pairing symmetries involving Chiral Fermi pockets in RhGe indicates the presence of nontrivial superconducting pairing. Our study establishes RhGe as a promising candidate material for hosting mixed-parity pairing and topological superconductivity.

* This work is supported by the Department of Atomic Energy of the Government of India under Project No. 12-R$&$D-TFR-5.10-0100 and benefited from the computational resources of TIFR Mumbai. H.L. acknowledges the support by the National Science and Technology Council (NSTC) in Taiwan under grant number MOST 111-2112-M-001-057-MY3. The work at Howard University was supported by the US Department of Energy, Office of Science, Basic Energy Sciences Grant No. DE-SC0022216. The work at Northeastern University was supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences Grant No. DE-SC0022216 and benefited from Northeastern University's Advanced Scientific Computation Center and the Discovery Cluster, and the National Energy Research Scientific Computing Center through DOE Grant No. DE-AC02-05CH11231. The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin for providing HPC resources that have contributed to the research results reported in this paper.

–

Publication: arXiv:2309.05880

Presenters

  • Sougata Mardanya

    Howard University, Howard university

Authors

  • Sougata Mardanya

    Howard University, Howard university

  • Mehdi Kargarian

    Sharif Univ of Tech

  • Rahul Verma

    Tata Institute of Fundamental Research, Mumbai, India

  • Tay-Rong Chang

    Natl Cheng Kung Univ, National Cheng Kung University

  • Sugata Chowdhury

    Howard University

  • Hsin Lin

    Academia Sinica

  • Arun Bansil

    Northeastern University

  • Amit Agarwal

    IIT Kanpur, India

  • Bahadur Singh

    Tata Institute of Fundamental Research Mumbai, Tata Institute of Fundamental Research, Mumbai, India, Tata Institute of Fundamental Research