Programme

P.62 -- Posters, VCTP-50

Date: Thursday, 7 August 2025

Time: 08:30 - 10:00

Thermoelectric properties in tilted 8-Pmmn borophene

Doan M. Quang (1), Nguyen Q. Bau (1), Ta T. Tho (2), and Bui D. Hoi (3)

(1) Department of Theoretical Physics, Faculty of Physics, University of Science, Vietnam National University, Hanoi; (2) Department of Physics, Faculty of Mechanical Engineering, Hanoi University of Civil Engineering, Hanoi; (3) Faculty of of Physics, University of Education, Hue University, Hue

We study the thermoelectric transport properties of gapped tilted-8-Pmmn borophene—a two-dimensional boron allotrope characterized by anisotropic electronic dispersion—using semiclassical Boltzmann transport theory under the constant relaxation time approximation. The low-energy effective Hamiltonian includes a tilted Dirac cone structure with a strain- or substrate-induced bandgap. We compute the electrical conductivity, Seebeck coefficient, and thermopower as functions of chemical potential, energy gap, and temperature. Our analysis reveals strong anisotropy in transport behavior between the x- and y-directions, with the x-direction showing superior conductivity and thermopower. Increasing the bandgap enhances the Seebeck coefficient and thermopower by bringing the Fermi level closer to the band edges, whereas higher temperatures improve electrical conductivity but reduce the Seebeck coefficient. These results underscore the promise of gapped 8-Pmmn borophene for nanoscale thermoelectric device applications.

Presenter: Bui Dinh Hoi