Work

Triplet p + ip pairing correlations in the doped Kane-Mele-Hubbard model: A quantum Monte Carlo study

Year: 2015

Type: article

Abstract: By using the constrained-phase quantum Monte Carlo method, we performed a systematic study of the pairing correlations in the ground state of the doped Kane-Mele-Hubbard model on a honeycomb lattice. We find that pairing correlations with d + id symmetry dominate close to half-filling, but pairing correlations with p + ip symmetry dominate as hole doping moves the system below three-quarters filling. We correlate these behaviors of the pairing correlations with the topology of the Fermi surfaces of the non-interacting problem. We also find that the effective pairing correlation is enhanced greatly as the interaction increases, and these superconducting correlations are robust against varying the spin-orbit coupling strength. Our numerical results suggest a possible way to realize spin triplet superconductivity in doped honeycomb-like materials or ultracold atoms in optical traps.

Source: Europhysics Letters (EPL)

DOI: 10.1209/0295-5075/111/47003

Authors: Tianxing Ma, Hai-Qing Lin, J. E. Gubernatis

Institutions: Beijing Normal University, Beijing Computational Science Research Center, Los Alamos National Laboratory

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, China Academy of Engineering Physics, Fundamental Research Funds for the Central Universities

Awards: G4971147017, G6026591740, G7335658245