https://doi.org/10.1140/epjp/s13360-022-02942-x
Regular Article
Direct mapping of edge states in bilayer zigzag phosphorene nanoribbons into a SSH ladder model and optimizing their thermoelectric performance via edge state engineering
Department of Physics, University of Isfahan, 81746-73441, Isfahan, Iran
Received:
12
April
2022
Accepted:
9
June
2022
Published online:
22
June
2022
Zigzag Phosphorene nanoribbon supports topological edge states in the gap region near the Ferm level. We consider a bilayer system consisting of two coupled Phosphorene layers with zigzag edges and investigate the thermoelectric properties of the system by engineering its corresponding edge modes. To this end, we first map the edge states of zigzag bilayer phosphorene nanoribbon (ZBPNR) into an effective Su-Schrieffer-Heeger (SSH) ladder model with momentum dependent hopping probabilities which allow us to obtain their corresponding band dispersion and wave functions analytically. Then, by applying the energy filtering method and employing non-equilibrium Green’s function approach, we show that the electric power and thermoelectric efficiency of the ZBPNRs can be improved remarkably in the presence of mid-gap edge states. We also argue how to engineer the edge modes to further optimize thermoelectric power and efficiency of the system by applying periodic point potentials at the boundaries
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
