Thermoelectric transport in two-terminal topological nodal-line semimetals nanowires

Recently discovered topological nodal-line semimetals (TNLSMs) have received considerable research interest due to their rich physical properties and potential applications. TNLSMs have the particular band structure to lead to many novel properties. Here we theoretically study the thermoelectric transport of a two-terminal pristine TNLSM nanowires and TNLSMsp-n-pjunctions. The Seebeck coefficientsSand the thermoelectrical figure of meritZTare calculated based on the Landauer-Büttiker formula combined with the nonequilibrium Green's function method. In pristine TNLSM nanowires, we discuss the effect of the magnetic fieldsφ, the disorderD, the on-site energyµ, and the mass termmon the thermoelectric coefficient and find that the transport gap can lead to a largeSandZT. When transmission coefficient jumps from one integer plateau to another,SandZTshow a series of peaks. The peaks ofSandZTare determined by the jump of the transmission coefficient plateau and are not associated with the plateau itself. For TNLSMsp-n-pjunctions,SandZTstrongly depend on the parameterξof potential well. We can get a largeZTby adjusting the parameterξand magnetic fieldφ. In TNLSMsp-n-pjunctions,ZThas the large value and is easily regulated. This setup has promising application prospects as a thermoelectric device.