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Non‐Centrosymmetric Superconductors on Honeycomb Lattice (Phys. Status Solidi B 9/2018)
Author(s) -
Lee DerHau,
Chung ChungHou
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201870131
Subject(s) - pairing , majorana , valleytronics , fermion , physics , condensed matter physics , superconductivity , parity (physics) , point reflection , spintronics , topology (electrical circuits) , singlet state , quantum mechanics , ferromagnetism , excited state , mathematics , combinatorics
Non‐centrosymmetric supercondutors (NCSs), long being discovered in heavy fermion systems, give rise to an exotic mixture of even‐parity spin‐singlet and odd‐parity triplet Cooper pairing due to their lack of spatial inversion symmetry. Der‐Hau Lee and Chung‐Hou Chung (article no. 1800114 ) theoretically investigate the topological nature of possible NCSs in much more tunable graphene‐based materials on the two‐dimensional honeycomb structure with both intrinsic and Rashba spin‐orbit couplings. The generic topologically non‐trivial superconducting phase diagram of the model system is explored. Over a certain parameter range, the authors find the existence of paritymixing superconducting state with co‐existing spin‐singlet d + id and spin‐triplet p + ip wave pairing. On a zigzag nanoribbon, the parity‐mixing superconducting state shows co‐existing counter‐propagating helical and co‐propagating chiral Majorana fermions at edges as a result of non‐trivial topological property. These results are applicable for transition metal dichalcogenides (TMDs), which show promising properties in valleytronics and spintronics applications.